The only statement on the options that says true about density is:> The density of an object determines whether it will sink or float.
Why?Density is a physical property of an object.
Density is not derived as a unit of measure. It is derived from 2 fundamental units: kg and m.
The Density of an object is not constant.
Density is calculated by dividing the mass by the volume of an object.
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The density of an object is constant.
Density is a derived unit of measure
The density of an object determines whether it will sink or float.
<u>Answer;</u>
<em>The moving car transfers kinetic energy to the parked car. </em>
<u>Explanation;</u>
- Energy is the ability of work to be done. It is measured in joules. The energy in an object depends on whether an object is in motion or at rest.
- Kinetic energy is the energy possessed by a body in motion. Calculated by 1/2mv², where m is the mass of the body and v is the velocity of the body in motion. Therefore, the moving car possess kinetic energy.
- When a body is at rest it posses potential energy. Thus, the parked car possessed kinetic energy which changed when it was hit by the moving car as the kinetic energy of the moving car was transferred to the parked car.
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Answer:
<u>The formula for the energy of motion is KE = .5 × m × v2 </u>
where KE is kinetic energy in joules,
m is mass in kilograms and
v is velocity in meters per second.
Explanation:
So in the above question
m=2.10kg
v=12.2m/s
KE=.5*2.10*(12.2)^2
K.E=.5*2.10*148.84
<u>K.E=156.282 joules</u>
