The average speed of the complete round trip is 65.57 km / h.
We need to know about the average speed to solve this problem. The average speed can be determined as the total distance divided by the total time. It can be written as
v = d / t
where v is average speed, d is distance and t is time.
From the question above, we know that
d1 = 300 km
v1 = 93 km/h
t lunch = 1 hour
d2 = 300 km
v2 = 56 km/h
Find the time during the outgoing
v1 = d1 / t1
t1 = d1 / v1
t1 = 300 / 93
t1 = 3.23 hours
Find the return time
v2 = d2 / t2
t2 = d2 / v2
t2 = 300 / 56
t2 = 5.36 hours
Hence, the total time
t = t1 + t2 + t lunch
t = 3.23 + 5.36 + 1
t = 9.59 hours
Find the average speed
v = d / t
v = (300 + 300) / 9.59
v = 65.57 km / h
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How many ml of a 5.0 m solution of sodium borate must be added to a 200 ml solution of 50 mm boric acid in order for the ph to be 9.6? the pka of boric acid is 9.24.
4.6 ml of a 5.0 m solution of sodium borate must be added to a 200 ml solution of 50 mm boric acid in order for the ph to be 9.6. the pka of boric acid is 9.24.
More about BoraxBorax, also known as sodium hydrated borate, is an ionic molecule having the chemical formula Na2H20B4O17, also written as Na2B4O710H2O. It is a crystalline solid that has no color and dissolves in water to form a simple solution.
It is frequently sold in powder or granular form and has a wide range of industrial and domestic applications, including as a pesticide, metal soldering flux, ingredient in glass, enamel, and pottery glazes, tanning agent for skins and hides, artificially ageing agent for wood, pharmaceutic alkalizer, and pesticide.
It serves as a buffer in laboratories that work with chemicals.
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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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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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True/false: you should begin viewing a specimen with the 10x objective lens.
a. true
b. false
You should begin viewing a specimen with the 10X objective lens that is false.
What is a lens?An optical device known as a lens uses refraction to focus or disperse a light beam. A compound lens is made up of multiple simple lenses (elements), typically aligned along a common axis, as opposed to a simple lens, which is one solid piece of transparent material. Glass or plastic are used to make lenses, which are then polished or molded into the required shape. In contrast to a prism, which just refracts light without focusing it, a lens can focus light to create an image. In addition to focusing visible light, lenses can also be used to disperse various types of waves and radiation, such as explosive, microwave, electron, and acoustic waves.
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The illustration shows a class one lever, which is being used to lift an object with a weight of 8 Newtons.
4m
What is the output force of this lever?
2 N
The output force of the given lever is determined as 32 Joules.
What is output force?
The output force of an object is the product of load or weight of an object being lifted and distance through which the load moves.
The output force of the given lever is calculated as follows;
Output force = Load x distance moved load
Output force = 8 N x 4 m
Output force = 32 Joules
Thus, the output force of the given lever is determined as 32 Joules.
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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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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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A) an electron has an initial speed of 226000 m/s. if it undergoes an acceleration of 4.0 x 1014 m/s2, how long will it take to reach a speed of 781000 m/s? answer in units of s.
The final speed is found to be 1.3 × 10⁻⁹ seconds.
Initial speed -226000 m/s
Acceleration - 4.0 x 1014 m/s2,
Speed - 781000 m/s
What is Acceleration?Acceleration is a rate of change of velocity with respect to time with respect to direction and speed.A point or an object moving in a straight line is accelerated if it speeds up or slows down.Acceleration formula can be written as,a = (v - u ) / t m/s²
As we have to find the time taken, the formula can be altered as,
t = v - u / a
where, t - time taken to reach a final speed
v - final velocity
u - initial velocity
a - acceleration.
Substituting all the given values,
[tex]t =\frac{781000 - 226000} {4* 1014}[/tex]
= 1.3875 × 10⁻⁹ seconds.
So, taken to reach the final speed is found to be 1.3 × 10⁻⁹ seconds.
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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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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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A decrease in one's ability to hear high-pitched, high frequency sounds is known as:_________
A decrease in one's ability to hear high-pitched, high frequency sounds is known as high-frequency hearing loss.
What is hearing?The term hearing has to do with the ability to pick out sounds. It is the ability to comprehend the meaning of sounds which may be disconnected or coherent.
Hearing occurs both at low and high frequency. The loss of hearing depends on what area of the ear that has been affected. Thus, if the inner ear of a person has been affected, there is a decrease in one's ability to hear high-pitched, high frequency sounds which is known as high-frequency hearing loss.
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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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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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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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what fives the identity of an atoms and its place on the periodic table
Answer:
atomic number
Explanation:
In the modern periodic table, the elements are listed in order of increasing atomic number. The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
*in the question you have written fives i think it has to be gives .*
please make my answer as brainelist
Describe one way to decide whether a sample of matter is a substance or a mixture
One way to decide whether a sample of matter is a substance or a mixture is by either finding its boiling (liquid) or melting (solid) point.
A substance has a constant boiling/melting point whereas a mixture has different boiling/melting points.
A substance is an element or a compound that cannot be separated using physical or chemical properties. A mixture is made up of two or more compounds which can be separated using physical or chemical properties.
Therefore the easiest way to decide whether a sample of matter is a substance or a mixture is by either finding its boiling (liquid) or melting (solid) point. If after multiple test the result is same it is a substance and if it is different it is a mixture.
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A bike accelerates from rest at 4 m/s/s. what is the velocity 3.5 s after the bike starts moving?
Find the mass of body which is accelerated by applying a force of 200n,that speed up it to 36 ms^-2
The mass of body which is accelerated by applying a force of 200n,that speed up it to 36 m/s^2 is 5.5 grams.
Given that,
Applied Force = 200n
Acceleration = 36m/s^2
Let,
consider a mass of the object = m
Now,
Formula used:
Force = mass / acceleration
F = m / a
m = f / a
m = 200/ 36
m = 5.5 gm
Therefore,
Mass of the body will be 5.5 grams.
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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.
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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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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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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A ball is thrown vertically upward and then comes back down. During the ball's flight up and down, its velocity and acceleration vectors are?
During the ball's flight up its velocity and acceleration vectors are in opposite direction and during the ball's flight down its velocity and acceleration vectors are in same direction.
The velocity vector is always in the direction of motion of the object. So, during the ball's flight up its velocity vector is in the upward direction (90°) and during the ball's flight down its velocity vector is in the downward direction (270°).When there is a positive acceleration in the object the acceleration vector is in the direction of motion of the object. When there is a negative acceleration in the object the acceleration vector is in the opposite direction of motion of the object. So, during the ball's flight up its acceleration vector is in the downward direction (270°) and during the ball's flight down its acceleration vector is in the upward direction (90°).Velocity vector is the rate of change of position of an object. Acceleration vector is the rate of change of velocity of an object.
Therefore, during the ball's flight up its velocity and acceleration vectors are in opposite direction and during the ball's flight down its velocity and acceleration vectors are in same direction.
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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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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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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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Why is the use of carbon- 14 dating limited?
Answer:
because carbon 14 has only a short half life, rather than other elements with longer half lives.
Explanation:
✨science✨
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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As shown in the figure below, a seal and shark are playing a fun game of tag. The seal swims
leftward 10 m then dodges rightwards another 20 m. The seal swims a total time of 6
20m
10m
What is the seal's average velocity during the chase?
What is the seal's average speed during the chase?
The seal's average velocity during the chase is 1.67 m/s.
The seal's average speed during the chase is 5 m/s.
What is average velocity?
The average velocity of an object is the change in the displacement of the object with time.
The seal's average velocity during the chase is calculated as follows;
Δx = xf - xi
Δx = 20 m - 10 m = 10 m
v = Δx/t
v = 10 m / 6 s
v = 1.67 m/s
Average speed of the sealThe average speed is the ratio of total distance to total time of motion.
v = (10 m + 20 m) / 6 s
v = 30 m / 6s
v = 5 m/s
Thus, the seal's average velocity during the chase is 1.67 m/s.
The seal's average speed during the chase is 5 m/s.
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As shown in the figure below, a seal and shark are playing a fun game of tag. The seal swims leftward 10 m then dodges rightwards another 20 m. The seal swims a total time of 6 s.
Answer:
What is the seal's average velocity during the chase?
Answer: 1.67 m/s
What is the seal's average speed during the chase?
Answer: 5 m/s
Answer:
Use the table below to answer questions 5-6.
Answer:
its also difficult for me.