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2 years ago

The gravitational force between two objects:

Physics

2 answers:

LUCKY_DIMON [66]2 years ago

8 0

The gravitational force between two objects INcreases

if either object gains mass , and also increases if the objects

are moved closer together.

Unlike the electrostatic force between charges, the gravitational

force between masses ALWAYS pulls them together, and never

pushes them apart.

jasenka [17]2 years ago

7 0

C. Gravitational force between two objects of masses m1/m2

is defined by Gm1xm2/r^2, where G is a universal constant, and r is the distance between the masses. This shows you why B is wrong; it would increase. Also, A is not a good choice, as shown. In the case of B, it would increase by say, 2/1 to 4/1 by doubling ones mass. In C's case the bottom would decrease on the fraction alot (square) if they were moved closer, thus the force would be greater.

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2 years ago

A mass of 5kg starts from rest and pulls down vertically on a string wound around a disk-shaped, massive pulley. The mass of the

Paha777 [63]

Answer:

c. V = 2 m/s

Explanation:

Using the conservation of energy:

$E_i =E_f$

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Mgh = $\frac{1}{2}IW^2 +\frac{1}{2}MV^2$

where M is the mass, g the gravity, h the altitude, I the moment of inertia of the pulley, W the angular velocity of the pulley and V the velocity of the mass.

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V = WR

Where R is the radius of the disk, so:

W = V/R

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