Answer:
The force of gravity after you double the mass and the distance is half of the initial force: 
Explanation:
The initial force of gravity is:

where
is the universal gravitational constant,
is the mass of the first object,
is the mass of the second object, and
is the distance between the objects.
If the mass of the second object is doubled, now we have
, and if the distance between the objects is also doubled instead of
now we have
.
So the force of gravity now is:

and we know that 
so the new force of gravity is:

The force of gravity after you double the mass and the distance is half of the initial force.
Unit is m^3 or metres cubed. You need to multiply the three dimensions of the block to get the volume.
A ruler can be used to measure the edges.
The option “The sum emitting light energy” does not describe the conversion of potential energy to kinetic energy.
Answer: Option A
<u>Explanation:
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The potential energy, the object's energy at rest while the kinetic energy is the energy the object in motion. So among the options given, a rocket leaving the Earth's atmosphere consists of conversion of potential energy as the thrusting force to kinetic energy of the movement of the rocket to space.
Similarly the stretching of rubber band is a form of elastic potential energy and when it is released, the band will vibrate which will be the converted kinetic energy.
Also, the avalanche is the falling of ice berg which were once in rest, so the potential energy of the ice berg will get converted to kinetic energy during avalanche.
The option that is the sun emitting light does not convert potential to kinetic energy, instead it converts potential to light energy.
Answer:
-78.4 cm
Explanation:
We can solve the problem by using the lens equation:

where
p is the distance of the object from the lens
q is the distance of the image from the lens
f is the focal length
Here we have
p = 80.0 cm
q = -39.6 cm (negative, because the image is on the same side as the object , so it is a virtual image)
Substituting, we find f:


Answer:
780 J
Explanation:
W=\int _{\:0}^{50}0.624xdx