SOLVED PROBLEMS
Problem-1: Calculate the velocity
of a moving body of mass 5 kg whose linear momentum is 2.5 kg m
s–1.
Solution: Linear momentum = mass ×
velocity
Velocity = linear
momentum / mass. V = 2.5 / 5 = 0.5 m s–1
Problem 2: A door is pushed, at a
point whose distance from the hinges is 90 cm, with a force of 40 N.
Calculate the moment of the force about the hinges.
Solution:
Formula: The moment of a force
M = F × d
Given: F = 40 N and d =
90 cm = 0.9 m.
Hence, moment of the
force = 40 × 0.9 = 36 N m.
Problem 3 : At what height from the
centre of the Earth the acceleration due to gravity will be 1/4th
of its value as at the Earth.
Solution:
Data: Height from the centre
of the Earth, Rʹ = R + h
The acceleration due to
gravity at that height, gÍ´ = g/4
From the centre of the
Earth, the object is placed at twice the radius of the earth.
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