Which of the following actions will keep the gravitational force between two objects unchanged

Physics

2 answers:

LenKa [72]3 years ago

4 0

The gravitational force between two objects is given by:

F = GMm/r²

F = force, G = gravitational constant, M and m are the masses, r = distance between the objects.

The force is dependent on only the masses of the objects and the distance between them. It is not dependent on the temperature of the objects.

Choice B

Pavel [41]3 years ago

4 0

Its b because i had this question on a test and it is correct

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A 30 kg box sits on the floor it requires 275N of force to get it moving once it is moving it only takes 225N of force.what are

gavmur [86]

1) The coefficient of static friction is 0.935

2) The coefficient of kinetic friction is 0.765

Explanation:

When a force is applied on a box sitting on the floor, the force that must be applied in order to make the box moving is equal to the maximum force of static friction between the floor and the box, which is:

$F = \mu_s mg$

where

$\mu_s$ is the coefficient of static friction

m is the mass of the box

g is the acceleration of gravity

Here we have:

m = 30 kg

$g=9.8 m/s^2$

F = 275 N

Therefore, the coefficient of static friction is

$\mu_s = \frac{F}{mg}=\frac{275}{(30)(9.8)}=0.935$

Once the box is in motion, the force that must be applied in order to make the box moving at constant velocity is equal to the force of kinetic friction between the floor and the box, which is:

$F = \mu_k mg$