The gravitational force acting on a particle of 1 g , due to a similar particle is equal to 6 . 67 × 10 - 17 N . Calculate the separation between the particles.

F = G m 1 m 2 r 2 , where G is universal gravitational constant, m 1 and m 2 are masses of two bodies. For above case m 1 = m 2 = 1 g = 10 - 3 kg G = 6 . 67 × 10 - 17 m 3 kg - 1 s - 2 Putting the given values, we get, 6 . 67 × 10 - 17 = 6 . 67 × 10 - 11 × 10 - 3 × 10 - 3 r 2 ⇒ r = 1 m

E M B I B E

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 4 - The Forces>OBJECTIVE II>Q 5

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IMPORTANT

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Which of the following systems may be adequately described by classical physics?

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Important Questions on The Forces

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 4 - The Forces>OBJECTIVE II>Q 6

The two ends of a spring are displaced along the length of the spring. All displacements have equal magnitudes. In which case or cases, the tension or compression in the spring will have a maximum magnitude?

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 4 - The Forces>OBJECTIVE II>Q 7

Action and reaction

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 4 - The Forces>EXERCISES>Q 1

The gravitational force acting on a particle of

1 g

, due to a similar particle is equal to

6.67 \times 10^{- 17} N

. Calculate the separation between the particles.

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 4 - The Forces>EXERCISES>Q 2

Calculate the force with which you attract the Earth.

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CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 4 - The Forces>EXERCISES>Q 3

At what distance should two charges, each equal to

1 C

be placed, so that the force between them equals a person's weight(Average mass

= 64 kg

)?

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 4 - The Forces>EXERCISES>Q 4

Two spherical bodies, each of mass

50 kg

, are placed at a separation of

20 cm

. Equal charges are placed on the bodies, and it is found that the force of Coulomb repulsion equals the gravitational attraction in magnitude. Find the magnitude of the charge placed on either body.

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IMPORTANT

CONCEPTS OF PHYSICS [VOLUME 1]>Chapter 4 - The Forces>EXERCISES>Q 5

A monkey is sitting on a tree limb. The limb exerts a normal force of