The answer for sub question A) calculate the percent uncertainty in the distance is 0.059%.
The answer for sub question B) calculate the uncertainty in the elapsed time is 9,012 s
The answer for sub question C) what is the average speed in meters per second is 4.681 m/s
The answer for sub question D) what is the uncertainty in the average speed is 0.0032 m/s
How are the answers calculated?To calculate the percentage of uncertainty of distance we have uncertainty = 25 m and distance = 42.188 km which is 42188 m.
Now [tex]\frac{25}{42188}[/tex] x 100% = 0.059%
To calculate time elapsed, we have the following data:
2hr which is 7200 s, 30 min which is 1800 s and 12 s
Adding these all up, we get 9012 s.
The average speed in m/s is calculated by 42188 m/ 9012 s = 4.681 m/s
The uncertainty in average speed is calculated by 4.681 m/s x [tex]\frac{0.059 + 0.01}{100}[/tex]
= 0.0032 m/s
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The complete question is A marathon runner completes a 42.188 km course in 2 h , 30 min, and 12 s . There is an uncertainty of 25 m in the distance traveled and an uncertainty of 1 s in the elapsed time. (a) Calculate the percent uncertainty in the distance. (b) Calculate the uncertainty in the elapsed time. (c) What is the average speed in meters per second? (d) What is the uncertainty in the average speed?
Which objects are found outside of solar systems but not inside it?
Exoplanets are found outside of solar systems but not inside it.
What are exoplanets?A planet outside the Solar System is referred to as an exoplanet or extrasolar planet. In 1917, the first potential sign of an exoplanet was observed, but it was not taken seriously. Exoplanets can be found using a variety of techniques. The majority of exoplanets have been discovered using transit photometry and Doppler spectroscopy, but these techniques suffer from a glaring observational bias that favors the discovery of planets close to the star; as a result, 85% of exoplanets discovered are located within the tidal locking zone. Multiple planets have been seen around a star in many instances. There is a "Earth-sized" planet in the habitable zone for about 1 in 5 Sun-like stars.Learn more about the Exoplanets with the help of the given link:
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What is the composition, in atom percent, of an alloy that consists of 92.5 wt g and 7.5 wtu? the atomic weights for silver and copper are 107.87 and 63.55 g/mol, respectively.
The composition in atom percent of an alloy that consists of 92.5 wt. g and 7.5 wtu is 12 %
Silver's atomic weight = 107.87 gm / mol
Weight in atoms of copper = 63.55 gm / mol
Percentage of silver weight =-92.5 %
Percentage of copper = 7.5 %
Percent composition of silver =
Weight of silver * weight of copper / percent of silver * weight of Copper + percent of copper * weight of silver *100
= 92.5 * 63.55 / 92.5 * 63.55 + 7.55 *107.87 *100
= 87.9%
Percent composition of copper =
Percent of copper * weight of silver / percent of silver * weight of Copper + percent of copper * weight of silver *100
=7 .5 * 63.55 / 92.5 * 63.55 + 7.55 *107.87 *100
=12.1 %
The atomic mass of an element is defined as ?This statement is False.
Atomic mass (sometimes known as atomic weight, however this term is erroneous because the mass is a property of the body while the weight depends on gravity) is the mass of an atom that corresponds to a certain chemical element. Typically, the uma (u) is employed as a unit of measurement. where u.m.a. stands for "unit of atomic mass." In honor of the English chemist John Dalton, this unit is also frequently referred to as the Dalton (Da). The Dalton is equal to one-twelfth of the mass of the carbon-12 nucleus, the most common isotope of carbon. It roughly equates to the mass of a proton (or a hydrogen atom). It is referred to as "uma," while "amu" is also its English abbreviation (Atomic Mass Unit). However, The suggested character is "u".
The weighted average of the masses of each isotope of each chemical element, which takes into account their relative abundance, is typically used to calculate the atomic masses of the chemical elements. This is what accounts for the discrepancy between an element's atomic mass in umas and the number of nucleons that contain the nucleus of its most prevalent isotope.
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Suppose that 2 j of work is needed to stretch a spring from its natural length of 30 cm to a length of 42 cm. (a) how much work is needed to stretch the spring from 35 cm to 40 cm?
[tex]\frac{25}{24}J[/tex]work is needed to stretch the spring from 35 cm to 40 cm.
Spring's Work
According to Hooke's Law, which may be used to calculate the amount of work needed to compress or expand the spring, [tex]F(x)=kx,[/tex] where [tex]F(x)[/tex] denotes the applied force, [tex]k[/tex] the spring constant, and [tex]x[/tex] the length of the spring that has been compressed or stretched from its normal length.
[tex]W=\int_a^b F(x) d x[/tex]
The following equation can be used to analyze the work done on the spring because work is the force exerted over a specific distance.
The integral is calculated using the information that it takes [tex]2J[/tex]of labor to pull a spring from a natural length of [tex]30[/tex] cm to [tex]40[/tex] cm, a difference of [tex]12[/tex] cm or [tex]0.12[/tex] cm.
[tex]\begin{aligned}W=\int_a^b F(x) d x &=\int_a^b k x d x & \\2 &=\int_0^{0.12} k x d x & \\2 &=\left.\frac{k x^2}{2}\right|_0 ^{0.12} & {[\text { Integrate] }} \\2 &=\frac{9}{1250} k & \\k &=\frac{2500}{9} & {[\text { Solve for } \mathrm{k}] }\end{aligned}[/tex]
(a) We must determine the amount of labor necessary to lengthen the spring from [tex]35[/tex] cm to [tex]45[/tex] cm, instead of starting with its natural length. Accordingly, the spring is extended from [tex]5[/tex] cm ([tex]0.05[/tex]cm) to [tex]10[/tex]cm ([tex]0.10 cm[/tex]) from its native length.
[tex]W=\int_a^b F(x) d x & =\int_a^b k x d x & \\ &[/tex]
[tex]=\int_{0.05}^{0.10} \frac{2500 x}{9} d x & \\[/tex]
[tex]= & \frac{2500}{9} \cdot \frac{3}{800} d x & \text { [Integrate] } \\ &[/tex]
[tex]=\frac{25}{24} & \text { [Simplify] }[/tex]
As a result, stretching the spring requires [tex]\frac{25}{24}J[/tex]works.
A force of 30 N will stretch the spring how far beyond its natural length?The spring will be stretched with a force of [tex]30 N[/tex], thus the next task is to calculate how far the spring will be stretched.
[tex]\begin{aligned}F(x) &=k x \\30 &=\frac{2500 x}{9} \\\Rightarrow x &=\frac{30 \cdot 9}{2500} \\x &=\frac{27}{250} \\x &=0.108 \text { meters }\end{aligned}[/tex]
The spring will therefore be lengthened by a distance of [tex]0.108m[/tex].
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Consider heat transfer through a wall of a house (no window) on a winter day. what parameters affect the rate of heat conduction through the wall?
Heat conduction parameters affect the rate of heat conduction through the wall.
What is heat conduction parameters?The interaction by which intensity is moved from the more blazing finish to the colder finish of item is known as conduction. Heat precipitously moves from a sultrier body to a colder body. For instance, heat is directed from the hotplate of an electric oven to the lower part of a pan in touch with it. Without a contradicting outside driving energy source, inside a body or between bodies, temperature contrasts rot after some time, and warm balance is drawn nearer, temperature turning out to be more uniform. The course of intensity conduction relies upon four fundamental factors, the temperature angle, the cross segment of the materials in question, their way length, and the properties of those materials. A temperature slope is an actual amount that depicts in which heading and at what rate the temperature changes in a particular area.
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Which of these talents is an HR employee MOST likely to need?
A.
the ability to envision retirement
B.
an interest in how unions work
C.
the ability to work independently
D.
an interest in helping people
HELP PLEASE
In 10 seconds a swimmer kicks off one the side of the pool to the other. as the swimmer makes their way across, they slow down at a constant rate until the come to a complete stop. if the width of the pool is 8.0 meters what was their initial velocity when they kicked off.
1.6 ms-1 was their initial velocity when they kicked off.
The velocity at time interval t = 0 is indicated by the symbol u. It is the speed at which the motion begins. Because the length of the pool is not given, the width is used to estimate the distance travelled;
Length of a swimming pool =8 m
A swimmer crosses it and then makes their way across
Total distance covered =8×2=16 m
Time taken =10 seconds
Initial velocity = distance/ time
=16/10
=1.6 ms-1
Therefore, the initial velocity is 1.6 ms-1. Note the question requested initial velocity since it is impossible to estimate the final velocity of the swimmer as he maintains a constant rate across the pool when swimming back.
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A reverse-biased silicon diode is connected in series with a 12 v source and a resistor. the voltage across the resistor is:__________
A 12 v source, a resistor, and a silicon diode that has been reverse-biased are all linked in series. The diode will use 0.7 volts of the voltage across the resistor, leaving 11.3 for the rest of the circuit's components.
What is the purpose of a resistor?The amount of electrical current that can flow through a circuit in an electronic device is controlled or limited by a resistor. Resistors can be used to deliver a certain voltage to an electronic element like a transistor.
Which various kinds of resistors are there?Resistors with a fixed value. These resistor configurations are the most common and, as their name implies, have a set resistance value.Adjustable resistors.Resistance Networks.Resistors made of carbon film.Resistors made of metal film.Wire wound resistorsResistor made of metal oxide.Strip metal resistorsTo know more about Resistors visit:
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The imidazole side chain of histidine has a pka of 6.04. illustrate the predominant structures for histidine at (i) ph 4, (ii) ph 8, and (iii) ph 12. indicate stereochemistry at the ca.
The histidine imidazole side chain has a pka of 6.04. To illustrate the predominant structures for histidine at (i) ph 4, (ii) ph 8, and (iii) ph 12, we have the pictures attached below. The first one indicates structure at ph 4, second one indicates ph 8 and third indicates ph 12.
What is stereochemistry?The study of stereochemistry is focused on stereoisomers, which by definition have the same molecular formula and sequence of bonded atoms (constitution) but differ in the three-dimensional orientations of their atoms in space.
Stereochemistry is a subfield of chemistry that deals with the relative spatial arrangement of atoms that form the structure of molecules and their manipulation. Because the prefix “stereo- “denotes “three-dimensionality,” it is also referred to as “3D chemistry.”
One crucial area of stereochemistry is the study of chiral molecules. Stereochemistry covers the entire range of organic, inorganic, biological, physical, and particularly supramolecular chemistry.
The study of stereochemistry involves techniques for identifying and describing these interactions, as well as the impact these relationships have on the physical or biological characteristics of the molecules in question.
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Compare the ball's accelerations, both direction and magnitude, immediately after they leave her hand. is one acceleration larger than the other? or are the magnitudes equal?
Both balls soon after they left her palm experienced the same amount of acceleration, but in opposite directions.
Further equation :We define acceleration a as the rate of change of velocity with respect to time for linear motion:
a = dv/dt = d²x/dt²
According to Newton's second law, a force F is required to accelerate a mass m:
F= ma
The forces exerted on the ball govern its acceleration. There is just one force acting on both balls at the moment they are released from the student's hand: gravity. Therefore, the amount and direction of the acceleration of both balls are the same:
F = mg with,
|g| = 9.81 m/s², pointing straight down.
Both balls soon after they left her palm experienced the same amount of acceleration, but in opposite directions.
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Does a negatively charged particle released at rest move towards higher or lower electric potential?.
A negatively charged particle released at rest will move towards regions of high potential in this context.
What is Electron potential?This is defined as the amount of work energy which is required to move a unit charge from one point to another in an electric field.
Negative charges which start from rest, accelerate from regions of low potential and move toward regions of high potential due to the strong Coulomb attraction.
On the other hand, positive charges starting from rest will accelerate from regions of high potential and move towards that of a low potential as a result of it having a weak coulomb attraction which makes it to easily get moved to a potential which has a weak strength.
This is therefore the reason why a higher potential was chosen as the most appropriate choice.
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What is the charge of an ion that contains 83 protons and 80 electrons? express your answer as an signed integer.
The charge of the ion is +3. Because there are 3 extra or +3 when you subtract 83 from 80, bismuth is Bi+3 (plus 3 is the ion charge)
What is charge of an ion?Conventionally, the charge of an electron is thought to be negative; this charge is equal to and opposite to the charge of a proton, which is thought to be positive. Because the total number of electrons in an ion is more than the total number of protons, the net charge of an ion is not zero.
In contrast to an anion, which is negatively charged but has more electrons than protons, a cation is an ion that is positively charged but has fewer electrons than protons.
Electrostatic force causes opposite electric charges to be drawn towards one another, causing cations and anions to attract one another and easily form ionic compounds.
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Find the matrix a of the linear transformation from r2 to r2 that rotates any vector through any angle of 120
The matrix of the linear transformation from ℝ2 to ℝ2 that rotates any vector through an angle of 120° in the anticlockwise direction is[tex]\left[\begin{array}{ccc}-1/2&\sqrt{3}/2 \\ \sqrt{3}/2 &-1/2\\\end{array}\right][/tex]
What is a matrix that can be taken for counterclockwise for an angle [tex]\alpha[/tex]
The matrix can be written as [tex]\left[\begin{array}{ccc} cos\alpha &sin\alpha \\ sin\alpha & cos\alpha \\\end{array}\right][/tex]
While putting the value of angle in the matrix, we have
[tex]\left[\begin{array}{ccc} cos120 &sin120 \\ sin120& cos120 \\\end{array}\right][/tex]
for [tex]\alpha[/tex] = 120
and thus, we have the answer as:
[tex]\left[\begin{array}{ccc}-1/2&\sqrt{3}/2 \\ \sqrt{3}/2 &-1/2\\\end{array}\right][/tex]
Therefore, the matrix can be stated as a matrix A of the linear transformation from r2 to r2 that rotates any vector through any angle of 120 in the anticlockwise direction.
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True or false: in applying the pythagorean theorem to vector addition, the resultant vector is given by the perpendicular vector.
It is False in applying the pythagorean theorem to vector addition, the resultant vector is given by the perpendicular vector
What is Pythagoras theorem ?A useful technique for figuring out the outcome of adding two (and only two) vectors that form a right angle to one another is the Pythagorean theorem. The technique cannot be used to combine more than two vectors or to combine vectors that are not at a 90-degree angle.
The Pythagorean Theorem is named for Pythagoras of Samos, a religious figure and mathematician who held the view that everything in the cosmos is made up of numbers. (There are numerous ways to demonstrate this.) The side opposite the right angle is known as the hypotenuse in a right triangle.The Pythagorean Theorem demonstrates how the side lengths of a right triangle can be calculated from the sum of the areas of three intersecting squares. This theorem is a very helpful tool that serves as the foundation for more intricate trigonometry ideas like the Pythagorean theorem's opposite.Learn more about Pythagoras theorem here:
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The _____ experiences a temperature _____ primarily due to the absorption of _____.
The thermosphere experiences a temperature increase primarily due to the absorption of gamma rays.
What is thermosphere?
The thermosphere is a layer of Earth's atmosphere that is directly above the mesosphere and below the exosphere.
Characteristics of thermosphereThe thermosphere is characterized by high temperature and large variability, in response to changes in solar ultraviolet radiation and solar activity.
Thus, the thermosphere experiences a temperature increase primarily due to the absorption of gamma rays.
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Write a solutions to the problem of finding the largest number out of three numbers
The largest number within three numbers is 42393 .
Solution,
First of all we have to take three numbers such as,
a: 29320 b: 41332 c: 42393
Enter three numbers: a: 29320 b: 41332 c: 42393
42393 is the biggest of all three numbers.
Taking algorithm of the above steps .
Algorithm:
Take the three numbers as input and store them in variables.Check the first number if it is greater than other two.Repeat the step 2 for other two numbers.Print the number which is greater among all and exit.To know more about Algorithm
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ice ages have occurred at several times during earth's history. what is an ice age, and how does an ice age affect the land surface and the oceans?
I have to get it done right now.. it is due today
Enter the chemical formula of a binary molecular compound of hydrogen and a group 7a element that can reasonably be expected to be less acidic in aqueous solution than hbr, e.g. have a smaller ka.
The chemical formula of a binary molecular compound of hydrogen and a group 7a element that can reasonably be expected to be less acidic in aqueous solution than HBr is HF
Group 7a that forms binary molecular compounds of Hydrogen are Halogens such as Iodine I, Bromine Br, Chlorine Cl and Fluorine F. Out of these four HF is the least acidic. This is calculated based on Acid dissociation constant. HF has the least value out of these four, so it is the least acidic.
A binary molecular compound is a compound that consists of two non metals elements only.
Therefore, the chemical formula of a binary molecular compound of hydrogen and a group 7a element that can reasonably be expected to be less acidic in aqueous solution than HBr is HF.
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A generic protein comprising 387 amino acid residues will have an estimated molecular mass of:____.
A generic protein comprising 387 amino acid residues will have an estimated molecular mass estimate of 42570 daltons.
What is a protein?Large biomolecules and macromolecules known as proteins are made up of one or more extended chains of amino acid residues. Proteins play a variety of roles in living things, including accelerating metabolic reactions, reproducing DNA, responding to stimuli, providing cells and organisms structure, and transporting chemicals. A linear chain of amino acid residues is referred to as a polypeptide. Proteins differ from one another primarily in their amino acid sequence, which is determined by the nucleotide sequence of their genes and typically results in protein folding into a specific 3D structure that determines its activity. At least one lengthy polypeptide is present in every protein.
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If one object has a greater speed than a second object, does the first necessarily have a greater acceleration? explain, using examples.
If one object has a greater speed than a second object, the first not necessarily have a greater acceleration.
Acceleration is the rate of change of velocity. An object can have a greater speed but with zero acceleration if the velocity is constant.
For example, Consider a driver A driving his car at a constant speed of 60 Kmph. and crosses another driver B. Consider driver B at rest the moment the driver A crosses him. But the driver B drives faster than the driver A and catches up with driver A even though the driver A was driving at 60 Kmph when the driver B just started driving from 0 Kmph.
Therefore, if one object has a greater speed than a second object, the first not necessarily have a greater acceleration.
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About how many days must elapse between first-quarter moon and the next full moon in the same cycle?
About 29.5 days must elapse between first-quarter moon and the next full moon in the same cycle.
What do you mean by the phases of the Moon?The different ways the Moon appears to Earth over the course of about a month are known as its phases. The side of the Moon that faces the Sun will be illuminated as it revolves around the Earth. The various forms of the illuminated region of the Moon that can be observed from Earth are referred to as their phases. Every 29.5 days, a new phase begins. Due to tidal locking, the same half of the Moon always faces the Earth. The same half of the Moon's surface will therefore always be covered by the phases.
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Hypothermia is an excessive decline in a body temperature.
true/ false
It's True that Hypothermia is an excessive decline in a body temperature.
What is Hypothermia?Hypothermia is condition that occurs when the body’s temperature drops below 95° F (35° C).The normal body temperature is 98.6° F (37° C). Hypothermia is medical emergency.
When a person’s body temperature is dangerously low, the brain and the body cannot function properly. Left untreated, hypothermia can lead to the cardiac arrest (heart stops beating) and death.
What are the treatments of Hypothermia?The first steps when treating hypothermia are:
Move to warm, dry location. Remove the wet clothing and replace with the dry clothing. Cover up with the jacket, hat, and blanket
When hypothermia is the more severe, doctors may also need to:
Insert IV into your vein and pump warm fluids into your body. Give you warm oxygen through a mask or a breathing tube. Use machine that warms your blood and pumps it back into your body
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What is the energy change when an electron in a hydrogen atom jumps from n = 2 to n = 5?
The energy change when an electron in a hydrogen atom jumps from n = 2 to n = 5 is 2.028×10 −19J.
What is hydrogen atom?A hydrogen particle is an iota of the synthetic component hydrogen. The electrically nonpartisan particle contains a solitary decidedly charged proton and a solitary adversely charged electron bound to the core by the Coulomb force. Nuclear hydrogen comprises around 75% of the baryonic mass of the universe. A hydrogen molecule is an iota of the compound component hydrogen. The electrically unbiased iota contains a solitary decidedly charged proton and a solitary adversely charged electron bound to the core by the Coulomb force. Nuclear hydrogen is around 75% of the baryonic mass of the universe.
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which three workers use technologies that apply the Doppler effect
A. an ultrasound technician
B. a pilot who needs to avoid bad weather
C. an insurance building inspector
D. a race-car mechanic
The three workers that use technologies that apply the Doppler effect are;
an ultrasound techniciana pilot who needs to avoid bad weathera race-car mechanicWhat is the Doppler effect?The term Doppler effect has to do with an increase or decrease in the frequency of sound as the observer moves towards or away from the source of the sound.
We know that;
fo = (v + vo/v + vs) fs
fo = frequency of the observer
v = velocity of sound
vs = velocity of source of sound
vo = velocity of observer
fs = true velocity of sound
The three workers that use technologies that apply the Doppler effect are;
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Identify each of the following as a representative element or a transition element.
a. lithium (li)
b. platinum (pt)
c. promethium (pm)
d. carbon (c)
Representative elements - elements where s and p orbital are filling.
these are also known as group A elements.
Transition elements - elements where d orbitals are filling. these are also known as d - group elements.
a. lithium (li) - Representative elements
It is element of alkali metals ( group 1A) .
Lithium atomic no. is 3
b. platinum (pt) - Transition elements
It is element of group 10 (d orbital)
platinum atomic no. is 78
c. promethium (pm) - Transition elements
Promethium atomic no. is 61
d. carbon (c) - Representative elements
It is element of block p.
Carbon atomic number is 6.
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You ride your bike at a constant speed of 5 for 300 a from your house to the mailbox What was your acceleration for the trip? (1 point)
00
05
O 300 s
Since the speed is the same through out, acceleration for the trip will be zero.
What is Acceleration ?Acceleration is the rate at which velocity is changing. It is a vector quantity.
If you ride your bike at a constant speed of 5 m/s for 300 s from your house to the mailbox, your acceleration for the trip will be equal to zero.
Because Acceleration = Change in speed ÷ time
Since the speed is constant, acceleration = 0/time = 0
Therefore, the acceleration for the trip is zero.
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Answer:
0 m/s^2
Explanation:
No change in speed or direction = constant velocity = no acceleration.
Astronauts brought back 500 lb of rock samples from the moon. how many kilograms did they bring back? 1 kg = 2.20 lb 227 kg 227 kg 498 kg 498 kg 500 kg 500 kg 1,100 kg
The correct option is (b) 227 kg.
The 500 lb rock samples the astronauts carried back from the moon weighed 227 kilograms.
Briefing :As with the end goal of exploring the New World, colonization, rather than just sitting back on Earth and contemplating what autonomous spacecraft report back, is the ultimate goal of going into space: to work and live there.It's one of the hardest jobs in the world to get. You are not almost certainly guaranteed to travel to space even if you are selected to be an astronaut.Many of the people selected to be "astronauts" never made it, despite the fact that hundreds of humans have visited space.The astronaut transported a 550 lb sample.
2.20lbs = 1 kilogram.
1 lbs = 1/2.20
Since, 1 lb = 0.45 kg,
500 lb almost equals 227 kg.
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Three objects are set in motion, a 4.4 kg object at 1.6 m/s, a 3.0 kg object at 3.0 m/s, and a 1.6 kg object at 4.4 m/s. which object has the most kinetic energy?
The third object has the most kinetic energy (15.49 joule).
We need to know about kinetic energy to solve this problem. kinetic energy can be defined as the energy of moving object. It can be determined by
KE = 1/2 . m . v²
where KE is kinetic energy, m is mass and v is speed of object.
From the question above, we know that:
m1 = 4.4 kg
m2 = 3.0 kg
m3 = 1.6 kg
v1 = 1.6 m/s
v2 = 3.0 m/s
v3 = 4.4 m/s
Find the kinetic energy
KE1 = 1/2 . m1 . v1²
KE1 = 1/2 . 4.4 . 1.6²
KE1 = 5.632 joule
KE2 = 1/2 . m2 . v2²
KE2 = 1/2 . 3. 3²
KE2 = 13.5 joule
KE3 = 1/2 . m3 . v3²
KE3 = 1/2 . 1.6 . 4.4²
KE3 = 15.49 joule
Hence, the third object has the most kinetic energy (15.49 joule).
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Roughly how long would it take a fast moving craft that was initially propelled by rockets to reach the nearest star to the sun?
In other words, it would take Deep Space 1 more than 81,000 years to travel the 4.24 light-years between Earth and Proxima Centauri at its top speed of 56,000 km/h.
How long would it take to get to the nearest star at the speed of light?At this speed, Voyager would take more than 73,000 years to reach Proxima Centauri. It would still take 4.22 years to get there even if we could move at the speed of light, which is not possible because of Special Relativity.
At perihelion, Helios 2 was able to reach a maximum velocity of approximately 240,000 km/h (150,000 miles/hour), which was attained by the Sun's gravitational attraction alone due to the significant eccentricity (0.54) of the probe's solar orbit (190-days). Even though, technically speaking, Helios 2's perihelion velocity was not a gravitational slingshot but rather a maximum orbital velocity, it continues to maintain the title of fastest man-made object.
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You watch two otters cross a river of width d with water flowing at vw. Otter 1 swims across the river perpendicularly to the shore (but ends up actually swimming diagonally from the reference frame of a person standing on the shore because the river flows in a direction perpendicular to the direction the otter swims). Otter 2 swims in a direction that takes her directly across the river, on a path that is actually perpendicular to the shore as seen from a person standing on the shore. Each otter swims at vo relative to the water and they take the paths described above. How much longer does the Otter 2 take to cross the river? To answer this, derive an expression for the ratio of the time taken by the Otter 2 to cross the river divided by the time taken by the Otter 1 to cross the river. Get the ratio in terms of vo and vw and select the correct answer.
The fur of a sea otter is the densest of any animal, having the most hairs per square inch of any other species. Even while floating in the water, their thick fur keeps the animal warm and dry.
Sea otters decrease heat loss when the water is too cold by floating on their backs with their feet out of the water. To increase their surface area when trying to dissipate heat, sea otters spread their feet out underwater. Sea otters typically spread out or tuck their feet up to maintain body heat. The amount of food available to sea otters would decrease if prey species in their environment declined as a result of changing temperatures.
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What wwould be abeeter material to use to make a frying pan - aluminiium or iron? why are iron pans not usully used by people who backpack?
Iron would be a better material to use to make a frying pan because, it is durable and great for baking or frying.
Iron pans are not used by people who use backpack or while travelling, because they are rather heavy and demand appropriate care.
Iron is the better material to use to make a frying pan.If a flat-bottomed pan is used for frying, searing, or browning food, it is referred to as a frying pan, frypan, or skillet.
It usually has a diameter between 20 and 30 cm (8 and 12 in), a long handle, fairly low sides that flare outward, and no cover.
On larger pans, a little grab handle may be found directly across from the main handle. Similar in size, but with less noticeable, more vertical sides, and frequently with a lid, is a sauté pan.
Even though it can be used as a frying pan, a sauté pan is designed for cooking at lower temperatures.
Fry pans were typically fashioned of cast iron, carbon steel, or copper with a tin coating due to their unique characteristics and properties.
Copper pans are ideal for evenly sautéing due to their excellent thermal conductivity. However, many copper pans are now offered with changeable tin linings because they are also quite reactive with most foods.
Even though they don’t transmit heat very uniformly, cast iron pans are used because they are effective for searing meats and vegetables.
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