Answer:
D. half as much
Explanation:
let m and M be the mass of the planets and r be the distance between them.
then: the force of attraction between them is given by,
F = G×m×M/(r^2)
if we keep one mass constant and double the other and also double the distance between them.
the force of attraction becomes:
F1 = 2G×m×M/[(2×r)^2]
= 2G×m×M/[4×(r)^2]
= (1/2)G×m×M/(r^2)
= 1/2×F
therefore, when you double one mass and keep the other mass constant and double the distance between the masses you decrease the force by a factor of 1/2.
The amount of energy needed to melt the ice is 1670 J
Explanation:
The amount of thermal energy needed to completely melt a certain amount of solid substance (already at melting point) is given by
where
m is the amount of the substance
is the specific latent heat of fusion of the substance
Here, the mass of the ice is
m = 5 g = 0.005 kg
And the specific latent heat of fusion of ice is
Assuming that the ice is already at melting point, the thermal energy needed to melt the ice is
Learn more about specific heat:
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Answer: c) Yes, since the choice of the zero of potential energy is arbitrary.
Explanation:
Potential energy depends on the frame in which you are looking at the system.
For example, the potential energy of a lifted object can be written as:
U = mgh
where m is the mass, g is the gravitational acceleration and h is the height of the object.
But the height depends on where we have the zero if the zero is in the ground, then and h = 5m, then the potential energy is positive, but the 0 is the ground of a cliff, and the object is falling down the cliff, then we will have a negative value for h, which implies that we have negative potential energy.
This means that if we want to make the potential energy equal to zero, we must apply kinetic energy to the object (for example, grabbing it and throwing it upwards). On the other hand, if the potential energy is positive, this means that the object will "produce" kinetic energy as the potential energy starts to decrease. For example, an object that is dropped from a three (with an initial kinetic energy of zero) and only potential energy, and as the object falls to the ground the potential energy goes to zero and transforms completely in kinetic energy.
Answer:
<h2>4.5 N</h2>
Explanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 0.75 × 6 = 4.5
We have the final answer as
<h3>4.5 N</h3>
Hope this helps you
