# Newton's Law of Gravitation

## Trending Questions

**Q.**Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will

- move towards each other.
- move away from each other.
- will become stationary.
- keep floating at the same distance between them.

**Q.**The variation of acceleration due to gravity g with distance d from the centre of the earth is best represented by (R = Earth's radius)

**Q.**

Two particles of equal mass go round a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is

**Q.**At what height from the surface of earth, the gravitational potential and the value of g are −5.4×107 J/kg2 and 6m/s2 respectively [take the radius of earth as 6400 km]

- 1400 km
- 2000 km
- 1600 km
- 2600 km

**Q.**

How do you find time with gravity and height?

**Q.**

Why does a body weigh more at the poles than at the equator?

**Q.**

Differentiate between gravitational constant($G$) and acceleration due to gravity($g$)

**Q.**

If the density of the earth is doubled keeping its radius constant then the acceleration due to gravity ( present value 9.8m/s^{2}) will be

$2.45$ m/s

^{2}$4.9$m/s

^{2}$9.8$m/s

^{2}$19.6$ mls

^{2}

**Q.**

The depth at which the effective value of acceleration due to gravity is g4 is (R = radius of the earth)

**Q.**

The depth d at which the value of acceleration due to gravity becomes 1/n times the value at the surface, is [R = radius of the earth]

**Q.**If the unit of force is 100 N, unit of length is 10 m and unit of time is 100 s, what is the unit of mass in this system of units?

**Q.**Minimum and maximum distance of a satellite from the center of earth are 2R and 4R respectively where R is radius of earth. Radius of curvature at the point when satellite is at a distance 2R is nR, here n is

**Q.**

The moon has no atmosphere, and acceleration due to gravity at its surface is one-sixth of that at earths surface. When a pendulum is taken from the earth to the moon, its time period will:

increase

decrease

unaffected

infinity

**Q.**If area (A) velocity (v) and density (ρ) are base units, then the dimensional formula of force can be represented as:

- A2vρ
- Avρ2
- Av2ρ
- Avρ

**Q.**Mass particles of 1 kg each are placed along x− axis at x=1, 2, 4, 8, .....∞. Then gravitational force on a mass of 3 kg placed at origin is (G= universal gravitational constant)

- 4G
- 4G3
- 2G
- ∞

**Q.**Let E be the energy required to raise a satellite to height h above earth's surface and E′ be the energy required to put the same satellite into orbit at that height. Then EE′ is equal to

- 2h(R+2h)

- 2h(2R+3h)

- R(R+h)

- R(2h+R)

**Q.**A mass M is split into two parts, m and (M–m), which are then separated by a certain distance. What ratio of m/M maximizes the gravitational force between the two parts

**Q.**If on heating liquid through 80∘C, the mass expelled is (1100)th of mass still remaining, the coefficient of apparent expansion of liquid is

- 1.25×10−4/∘C
- None of these
- 1.25×10−5/∘C
- 12.5×10−4/∘C

**Q.**

Why is Newtons law of gravitation called inverse square law?

**Q.**The centripetal force acting on a satellite orbiting round the earth and the gravitational force of earth acting on the satellite both are equal to F. The net force on the satellite is

- F
- 2 F
- Zero

**Q.**

Is gravity the opposite of entropy

**Q.**Assuming the earth to be a sphere of uniform mass density, how much would a body weigh halfway down to the centre of the earth if it weighed 250 N on the surface ?

**Q.**

What is the difference between the gravitational force and the force of gravity?

**Q.**The earth (mass=6×1024 kg) revolves around the sun with an angular velocity of 2×10−7 rad/s in a circular orbit of radius 1.5×108 km. The force exerted by the sun on the earth (in Newtons) is

- 36×1021
- 27×1039
- Zero
- 18×1025

**Q.**

A semicircular wire has a length L and mass M A particle of mass m is placed at the centre of the circle.

Find the gravitational attraction on the particle due to the wire.

**Q.**

Three identical point masses, each of mass 1 kg lie in the x-y plane at points (0, 0, 0), (0, 0.2m) and (0.2m, 0). The net gravitational force on the mass at the origin is

1.67×10−9(^i+^j)N

3.34×10−10(^i+^j)N

1.67×10−19(^i+^j)N

3.34×10−10(^i+^j)N

**Q.**

A straight rod of length L extends form x=a to x=L+a. The gravitational force on a point mass m at x=0 if the mass per unit length of the rod is (A+Bx2), is

**Q.**Let VG and EG denote the gravitational potential and field respectively in a region, then choose the wrong statement.

- VG=0, EG=0
- VG≠0, EG=0
- VG=0, EG≠0
- VG≠0, EG≠0

**Q.**A wire ring of diameter 14 cm is gently lowered on to a liquid surface and then pulled up. When the film just breaks, the force required is 0.0616 N. The surface tension of the liquid is

- 70 N/m
- 70 dyne/cm
- None of these
- 70 N/m

**Q.**An ∝ particle is situated in an electric field of 106 N/C. The force exerted on it is

- 6.4×10−3N
- 3.2×10−13N
- 32×10−13N
- 64×10−13N