The density of a fish is controlled by the expansion and contraction of its air sacs while the density of a submarine is controlled by ballast tanks. It was emphasized earlier that buoyant forces does not equal an objects weight but does equal the weight of displaced water.
What are mass, density, and volume ?The three most fundamental characteristics of an object are mass, volume, and density. Volume indicates something's size, mass indicates how heavy it is, and density is calculated as mass divided by volume. Although you deal with mass and volume on a daily basis, the concept of density is less clear-cut and requires careful consideration.
Mass divided by density equals volume; and. Volume times density equals mass. A liquid's density is a gauge of how heavy it is relative to the amount being measured. The liquid that weighs heavier is more dense if you weigh two liquids with similar volumes or amounts.
The relationship between a substance's mass and the amount of space it occupies is known as its density (volume). The density of a substance is determined by the mass, size, and arrangement of its atoms.
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How many grams of calcium metal is required to react with 7.75 g water to produce calcium hydroxide and hydrogen gas?
87.69 grams of calcium metal is required to react with 7.75 g water to produce calcium hydroxide and hydrogen gas.
Ca (OH)2+2H2 = CaH2 + 2H2O
Convert grams of hydrogen to moles of hydrogen.
H2 has a molar mass of 2.016 g/mol.
1 mol H2 x 8.400g H2
2.016g H2 equals 4.1667 mol H2
Calculate the moles of CaH2 using the molar ratio.
The molar ratio is 1 mol CaH2: 2 mol H2, according to the equation that is balanced.
2.0833 mol CaH2 = 4.1667 mol H2 1 mol CaH2 2 mol H2
grams of CaH2 to CaH2
CaH2 has a molar mass of 42.09 g/mol.
1.mol CaH2=87.69 g CaH2 2.0833mol CaH2=42.09 g CaH2
87.69 g CaH2 are required for the reaction.
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4. What is the density of a cube that when placed on a triple beam balance measures to be 64g and has volume of 8cm 3 ?
This is an exercise on the density of liquids and gases.
The data provided in the exercise are:
Density (d) = ?
Mass (m) = 64g
Volume (v) = 8cm³
To calculate the density of the cube when it is placed on the balance, divide the mass divided by the volume. We apply the following formula:
d = m/vWe substitute our data in the formula and solve:
d = (64 g)/(8 cm³)d = 8 g/cm³Answer: The density of the cube placed on the three-beam balance is 8 g/cm³. ✅
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The complete statement is → At the summer solstice in the northern hemisphere, the sun travels longest path through the sky.
We have a statement regarding summer solstice in northern hemisphere.
We have to complete the statement using appropriate words.
What is Summer Solstice?A Solstice that marks the onset of summer. To be more precise, 21st June in northern hemisphere marks the summer solstice and 22nd December in southern hemisphere marks the Summer solstice.
According to the question, we have -
At the summer solstice in the northern hemisphere, the sun ____.
The given sentence can be completed as →
At the summer solstice in the northern hemisphere, the sun travels longest path through the sky.
On this day, there is more daylight. During the summer solstice in northern hemisphere, the north pole is shifted 23.4° toward the Sun which lasts until the autumnal equinox (September 22 or 23) where it ends.
Hence, the complete statement is → At the summer solstice in the northern hemisphere, the sun travels longest path through the sky.
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________ provides the raw material for evolution because it can create new alleles, which are alternative forms of the same ______.
Mutation provides the raw material for evolution because it can create new alleles, which are alternative forms of the same gene.
A mutation is a variation or change that occurs spontaneously in the sequence of the genes that make up the deoxyribonucleic acid (DNA).
Mutations can occur at three different levels:
Molecular (gene or point): Occurs in the DNA sequenceChromosomal: A chromosome segment is altered Genomic: Affects a specific set of chromosomeWhat is a gene?In biology, a gene is a unit composed of a chain of deoxyribonucleic acid (DNA) that contains the necessary information to transfer hereditary traits from one generation to the next.
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Which scientist developed the theory of gravitation and used it to explain the orbits of celestial bodies?
Isaac Newton developed gravitational theory and used the theory to describe the orbits of celestial bodies
Newton's law describes the "strength of the force of gravity between two objects," which decreases as one moves away from light. It is mathematically recognized as an "inverse square law."
The following process for picturing the field drop-off is to envision the field of gravity around an object as a set of concentric spheres. Each sphere represents the same volume of the gravitational field, but the spheres furthest from the object are larger, resulting in the same volume of field is distributed thinly over a larger area.
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What differences would rutherford have observed if he used aluminum foil instead of gold foil?.
The gold sheet used was around 1000 atoms thick.
What differences would Rutherford have observed if he used aluminum foil instead of gold foil?The Rutherford observed that the use of aluminium foil will be better instead of gold foil, the reason is given below. The gold is very cheap metal so due to this property it can be easily turned into thin thin foil, Rutherford wants the thinnest layer as thin as possible. If any other metal foil is used in place of gold then also there will be no change in the observations if the metal foil to be used is as thin as gold foil.
So we can conclude that the gold sheet used was around 1000 atoms thick.
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Describe a situation in which you can accelerate even though your speed doesn’t change.
Acceleration is not the same as speeding up. It refers to any modification of motion's direction or speed. Accelerated motion is any movement that is not constant speed in a straight line.
What is meant by acceleration?In physics, acceleration refers to the rate at which an object's velocity over time changes. They are accelerations and vector quantities. The direction of an object's acceleration is determined by the direction of the net force acting on it.
Depending on whether an object is moving faster, slower, or in a different direction, its velocity may change. Examples of acceleration include a falling apple, the moon orbiting the earth, and a car that has stopped at a stop sign.
Acceleration is the measure of a change in velocity. Acceleration frequently, though not always, denotes a shift in speed. The direction of motion is changing, therefore an object moving at a constant speed in a circular path is still moving ahead.
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With light microscopy, if the objective lens (lens closest to the specimen) magnifies 40-fold, and the eyepiece lens magnifies 10-fold, the final magnification will be:_________
The final magnification will be 400-fold or 400 times the original size of the object.
For magnifying smaller objects, a compound microscope is used.
A compound microscope consists of an objective and an eyepiece, whose diagram is shown in the adjoining image.
The lens near the object is called an objective and the other one is the eyepiece.
Let the magnification of the objective be m1
Let the magnification of the eyepiece be m2
The final magnification by the microscope, M, will be
M = m1 x m2
Putting the values in the above equation
M = 40 x 10
M= 400
Thus, the final magnification will be 400-fold or 400 times the original size of the object.
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two gliders are set in motion on a horizontal air track. a light spring of force constant k is attached to the back end of the second glider. both gliders are having the same mass m. the first glider moves to the right with speed v1 and the second is at rest. when the first glider collides with the spring attached to the second glider, the spring compress by a distance xmax, and the gliders then move apart again. in terms of v1, m, and k, find
The constant velocity of center of mass when the spring is at maximum compression is V = ( [tex]m_{1} v_{1}[/tex] + [tex]m_{2} v_{2}[/tex] ) / ([tex]m_{1} + m_{2}[/tex] )
When two objects collide the momentum is always conserved no matter the type of collision. But in case of kinetic energy, it is conserved only if the collision is elastic. Here the collision is elastic due to the presence of a spring. So, in this situation kinetic energy is conserved.
At maximum compression, According to law of conservation of momentum,
Sum of linear momentum before collision = Sum of linear momentum after collision
[tex]m_{1} v_{1}[/tex] + [tex]m_{2} v_{2}[/tex] = ([tex]m_{1} + m_{2}[/tex] ) V
V = ( [tex]m_{1} v_{1}[/tex] + [tex]m_{2} v_{2}[/tex] ) / ([tex]m_{1} + m_{2}[/tex] )
where,
V = Velocity of center of mass
[tex]m_{1}[/tex] = Mass of glider 1
[tex]m_{2}[/tex] = Mass of glider 2
[tex]v_{1}[/tex] = Velocity of glider 1
[tex]v_{2}[/tex] = Velocity of glider 2
Therefore, the constant velocity of center of mass when the spring is at maximum compression is V = ( [tex]m_{1} v_{1}[/tex] + [tex]m_{2} v_{2}[/tex] ) / ([tex]m_{1} + m_{2}[/tex] )
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An electron not only moves around the nucleus but also on its own axis, thus generating a tiny field. The direction of this field is described by the quantum number, ms, which is not related to any specific orbital but is a property of the electron itself. True or false?.
Yes, the given statement is true.
An electron not only moves around the nucleus but also rotates on its own axis, thus generating a tiny magnetic field. The direction of the field is described by the spin quantum number, ms, which is not related to any specific orbital but is a property of the electron itself.
An atom is made up of three fundamental particles electrons, protons, and neutrons, and a positively charged nucleus. In an atom, electrons rotate on their axis as well as aorund the nucleus.
The rotational movement of electrons around the nucleus creates a magnetic field.
However, the magnetic forces cancel out each other due to the opposite spins of the electrons.
similarly, in a wire, the movement of electrons generates a magnetic field around the wire.
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What would be the average fixed cost per unit at an activity level of 5,200 units? assume that this level of activity is within the relevant range.
The average fixed cost per unit at an activity level of 5,200 units is $6.00.
What is the average fixed cost?The average fixed cost (AFC) is fixed cost that does not change with the change in the number of goods and services produced by a company. To put it in a nutshell, average fixed cost (AFC) is the fixed cost per unit and is calculated by dividing the total fixed cost by output level.
Since no cost is fixed for a long time, average fixed cost is only for a short run. When units of production increase, the average fixed cost per unit decreases. Similarly, when the business produces less units, average cost increases per unit.
However, only one unit, mostly capital, is fixed. Examples of average fixed cost are the salaries of permanent employees, mortgage payment on machinery and plant, rent, more.
Average Fixed Cost Formula:
AFC = Total fixed cost/Output (Q)
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In order to get the ketchup in a bottle to come out easier, you hit the bottom of the bottle while it is inverted (upside down). Which of Newton's laws best describes why this works?
Answer:
His second law. "The acceleration of an object depends on the mass of the object and the amount of force applied."
Explanation:
The harder you hit the faster and more the ketchup comes out
What is the electric flux passing through a gaussian surface that surrounds a 0.075 c point charge?
An 0.075 c point charge's surrounding gaussian surface's electric flux is 8.5 ×10⁹Nm²/C.
Which is a gaussian surface?In three dimensions, the Gaussian surface is referred to as a closed surface where the flux of a vector field may be determined. The gravitational field, the electric field, or the magnetic field are all examples of these vector fields.
Why is a Gaussian surface drawn?We build a fictitious Gaussian surface around the supplied surface when the surface of which an electric field or flux must be established is asymmetrical or the surface area is challenging to obtain, such as the surface area for an infinitely long wire or plane. The Gaussian surface is said to utilize symmetry the best.
When a charge q is surrounded by a gaussian surface, the electric flux that passes through it is
[tex]\phi=q / \epsilon 0[/tex]= 0.075 / ( 8.85 ×10⁻¹²)
= 8.5 ×10⁹Nm²/C.
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Which photon energies will excite the hydrogen atom when its electron is in the ground state?
The photon energy excite the hydrogen atom when its electron is in the ground state −13.6eV.
The second energy level is -3.4 eV.
Therefore, if we calculate the energy levels E₁ & E₂
E₂ − E₁ = -3.4 eV − -13.6 eV = 10.2 eV
Hence, the above expression shows, to excite the electron from the ground state to the first excited state. Similarly
The energy of the electron in ground state is −13.6eV.and the energy required to move electrons from ground state to third excited state is 12.75eV.
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For a relative frequency distribution, relative frequency is computed is computed as ____________.
Answer:
For a relative frequency distribution, relative frequency is computed as the class frequency divided by the number of observations.
What is the frequency (s-1) the light from a laser with a wavelength of 615 nm? enter your answer with three decimals and no units.
The frequency of light from a laser is 4.878 x10^ 14 s-1 hertz
Stepsv= c/ lambda
c= 3.00 x10^8 m/s
nm into meters
615nm (1m/ 1x10^9 nm) = 6.15x 10^-7 m
use frequency formula
v = 3.00 x10^8 m/s // 6.15 x10 ^-7
v = 4.878 x10^ 14 s-1 hertz
The frequency of light from a laser is 4.878 x10^ 14 s-1 hertz
What do you mean by frequency?The quantity of waves that pass a set location in a predetermined period of time is known as frequency. Therefore, if a wave passes through in half a second, the frequency is 2 per second. The frequency is 100 times per hour if it takes 1/100 of an hour.
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A student investigated how different coloured light was refracted by glass.
The student aimed rays of different coloured light at a glass block.
She measured the angle of refraction for each colour.
Give two variables that the student should control.
Two variables the student should control in the experiment are:
amount of lightthe angle of incidence of the incident light.What are variables in an experiment?Variables in an experiment refers to those factors which can be changed by the researcher and these changes in these variables will result in changes in the result of the experiment.
There are three types of variables in an experiment and they are:
Independent variable: this variable does is changed by the researcher and results in changes in the variable being tested.
Dependent variable: this is the variable being tested and is affected by changes in the independent variable.
Control or constant variable : this variable is kept constant in the experiment.
Considering the investigation by the student:
the student investigated how different colored light was refracted by glassthe student aimed rays of different colored light at a glass block measured the angle of refraction for each colorTwo variables the student should control are:
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In a mass spectrometer, a compound is first vaporized and converted into ions, which are then separated based on a difference in their _______________________.
The correct answer is their difference in the charge to mass ratio a mass spectrometer, a compound is first vaporized and converted into ions .
Mass spectrometry is a technique for determining the mass-to-charge ratio (m/z) of one or more molecules in a sample. These measurements are frequently used to calculate the precise molecular weight of the sample components.
The speed at which positively charged ions move through a vacuum chamber toward a negatively charged plate is measured by mass spectrometers. ToF, magnetic sector, and quadrupole mass spectrometers are all commonly used in SIMS instrumentation.The MS/MS has three major advantages: the ability to study numerous molecules regardless of whether they are from the same structural family or not; the ability to highlight the specific metabolites of a disease; and it is an automated technique that allows for large-scale analysis.
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What role is played by physics in communication
Explanation:
physics allow us to understand the electromagnetic radiation we used to transmit data with fibre optics and satellites and to build computers that interpret those signals and transmit data on the internet
How much work does it take to slide a crate m along a loading dock by pulling on it with a -n force at an angle of from the horizontal?
The work needed to slide the crate at a distance of 22 m is
[tex]$W=4.38 \times 10^3 J$[/tex]
What is meant by work done?The work done by a constant force on an object as the object moves along a displacement vector [tex]$\vec{d}$[/tex] is given by the formula involving the dot product of the two vectors:
[tex]$W=\vec{F} \cdot \vec{d}=F d \cos (\theta)$$[/tex]
Where [tex]$\vec{F}[/tex], F is the force vector and its magnitude respectively, [tex]$\vec{d}[/tex], d is the displacement vector and its magnitude respectively and [tex]$\theta$[/tex] is the angle between the displacement vector and the force vector.
Given:
Force acting on the crate, F = 230 N
Distance traveled by the crate,
[tex]$d=22 \mathrm{~m}$$[/tex]
The angle between the force and the displacement,
[tex]$$\theta=30^{\circ}$$[/tex]
Then the work done by the force on the crate as it travels 22 m under the action of the force is
[tex]$W &=F d \cos \theta \\[/tex]
[tex]$&=230 \times 22 \cos 30^{\circ} \\[/tex]
simplifying the above equation, we get
[tex]$&=230 \times 22 \times \frac{\sqrt{3}}{2} \\[/tex]
[tex]$&=4382.089 \mathrm{~J} \\[/tex]
[tex]$&=4.38 \times 10^3 \mathrm{~J}[/tex]
Therefore the work needed to slide the crate at a distance of 22 m is
[tex]$W=4.38 \times 10^3 J$[/tex]
The complete question is:
How much work does it take to slide a crate 22m along a loading dock by pulling on it with a [tex]$230-\mathrm{N}$[/tex] force at an angle of [tex]$30^{\circ}$[/tex] from the horizontal?
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1. if a wave traveling through air decreases its wavelength by half, what happens to the wave speed and frequency?
Wave speed decreases by half while the frequency remains constant.
For any wave the equation [tex]v = f \lambda[/tex] holds true.The frequency is a quality of a given wave and it does not change with the external parameters.So, the possibility is for the [tex]v[/tex] and [tex]\lambda[/tex] to change accordingly.Therefore, [tex]v[/tex] and [tex]\lambda[/tex] are directly proportional to each other. Thus when the wavelength decreases by half the speed also decreases by half.This can be shown as follows as well.
[tex]\begin{aligned}\\\small v_1 &=\small f.\lambda_1\quad\cdots\cdots(1)\\\\\small v_2 &=\small f.\frac{\lambda_1}{2}\quad\cdots\cdots(2)\\\\(2)\div&(1)\\\\\small v_2 &=\small \frac{v_1}{2}\end{aligned}[/tex]
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write a hypotheses about the use of an objects physical charecteristics to determine its density use the format "if then because" and be sure to answer the lesson question "how can the density of an object be determined?
i don't know.
Explanation:
because i don't want responde
The two major atmospheric gases that absorb energy from the sun are :__________
a. hydrogen and carbon dioxide.
b. carbon dioxide and water vapor.
c. nitrogen and hydrogen.
d. oxygen and nitrogen.
Carbon dioxide and water vapor are the two principal atmospheric gases that absorb solar energy.
What do you mean by atmospheric gases?Gases in the atmosphere of the Earth are referred to as atmospheric gases. While greenhouse gases (carbon dioxide, methane, nitrous oxide, water vapor, and ozone) only make up 1% of the air, they make up the majority of these gases, which account for 99% of the air's composition. Several separate gases, each with unique characteristics, are actually mixed together to form the air. Air's chemical makeup changes throughout time. It could change over time and from location to location. There are also some varying elements in the air in our environment. Water vapor, dust particles, and ozone are some of these changeable elements. The weather and environment can be significantly impacted by these, despite their rarity and low concentration.
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A thermometer that consistently measures five degrees cooler than the actual temperature is:________
A thermometer that consistently measures five degrees cooler than the actual temperature is reliable but not valid.
What is a thermometer?A thermometer is a device used to measure temperature or a temperature gradient (the degree of hotness or coldness of an object). A thermometer is made up of two essential parts: a temperature sensor that adapts to changes in temperature (such the bulb in a mercury-in-glass thermometer or the pyrometric sensor in an infrared thermometer), and a means to convert this change into a numerical value. In order to monitor processes, thermometers are frequently employed in technology, industry, meteorology, medicine, and scientific study.
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Which has zero acceleration?
a. at rest.
b. moving at constant velocity.
c. in mechanical equilibrium.
d. all of these
e. none of these
At rest, when travelling at a constant speed, and when in mechanical equilibrium, there is no acceleration and answer choice D is correct.
How would you define acceleration?In mechanics, acceleration describes the rate at which a driving object's velocity changes over time. They are accelerations and vector quantities. The direction of an object's acceleration is determined by the direction of the net force acting on it. Depending on whether an object is moving faster, slower, or in a different direction, its velocity may change. Examples of acceleration include a falling apple, the moon orbiting the earth, and a car that has stopped at a stop sign. The car is positively accelerating if the speed is increasing. As the car slows down, its speed decreases. A decline in speed is referred to as negative acceleration. In both situations, the car is traveling ahead, yet one has a positive acceleration and the other a negative one.
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who drink water with no mouth?
Answer: Tree
Explanation: Cause they don't have mouth to drink water they just have root
A plane lands on a runway with a speed of 115 m/s, moving east, and it slows to a stop in 11.0 s. what is the magnitude and direction of the plane's average acceleration during this time interval?
By using uniform motion, the acceleration of plane is - 10.45 m/s² .
We need to know about the uniform motion to solve this problem. The uniform motion is the motion of an object which has acceleration applied. It can be determined as
vt = vo + a . t
vt² = vo² + 2a . s
s = vo . t + 1/2 . a . t²
where vt is final velocity, vo is initial velocity, a is acceleration, t is time interval and s is displacement.
From the question above, we know that:
vi = 115 m/s
vt = 0
t = 11 s
By using first equation, we can calculate the acceleration
vt = vo + a . t
0 = 115 + a . 11
11a = -115
a = - 10.45 m/s²
Hence, the acceleration of plane is - 10.45 m/s² .
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If the mass of an object is 14 lbm, what is its weight, in lbf, at a location where g = 32.0 ft/s2?
The mass of the object is 13.924 lbf.
CalculationUsing the formula:
w = m x g ....... eq1
here w is weight of the object.
m is mass of the object, and
g is the acceleration of gravity.
mass, m = 14 lbm (given)
acceleration of gravity, g= 32.0 ft/[tex]s^{2}[/tex]
Now, substituting the values in equation (1):
w = 14lbm x 32.0 ft/[tex]s^{2}[/tex] = 448 lbm ft/[tex]s^{2}[/tex]
since, 1 lbf = 32.174 lbm ft/[tex]s^{2}[/tex]
so, w = 448 x [tex]\frac{1}{32.174}[/tex]
w = 13.924lbf
Hence, the mass of an object is 13.924 lbf.
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PLS HELP ILL GIVE BRAINLIEST
AND IF YOURE ABLE TO PLS PROVIDE THE EXPLANATION TYSMMMM
In frustration, a junior drops the APUSH textbook 1.5 m. How long will it take to hit the ground?
The time taken for the APUSH textbook to hit the ground is determined as 0.55 seconds.
What is time of motion?The time of motion of an object is the time taken for the object to travel from its initial point to the final point.
The time taken for the APUSH textbook to hit the ground is calculated as follows;
t = √(2h/g)
where;
h is the height of fall of the textbookg is acceleration due to gravityt = √(2 x 1.5/9.8)
t = 0.55 seconds
Thus, the time taken for the APUSH textbook to hit the ground is determined as 0.55 seconds.
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If the outside air temperature increases during a flight at constant power and at a constant indicated altitude, the true airspeed will:__________
The true airspeed will increase and true altitude will increase.
What is true air speed?True airspeed is the airspeed of an aircraft relative to undisturbed air.
It's the aircraft speed relative to the airmass in which it's flying.
How does outside air temperature affect air speed?If the outside air temperature increases during a flight at constant power and at a constant indicated altitude, the true airspeed will increase and true altitude will increase.
Thus, the true airspeed will increase and true altitude will increase.
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