a) A girl with a mass of 45 kg is standing on a scale in a lift. What is the weight of the girl when (i) the lift is accelerating upwards at 2.0 ms s −2 and (ii) the lift is moving down with a constant velocity. Calculate the inertial force in each case. (5) b) An object is being rotated in a centrifuge which has a radius of 6.0 m. If the acceleration of the centrifuge is 3 g, calculate the velocity of object and the time period of its motion.
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Hi Friend,
When the lift moves upwards,the new force acts with the net force.
=mg +ma
=m(g+a)
=60(10+2)
=60(12)
F=720 N
When the body acts against the gravity, the new force tends to decrease the net force.
=m(g-a)
= 60(10-2)
=60(8)
F=480N
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