SOLUTION: A man with a mass of 65 kg stands in an elevator. The elevator initially accelerates uniformly for 1.8s followed by a period of a constant velocity of 2.5ms^-1 and then a final uni
Algebra ->
Test
-> SOLUTION: A man with a mass of 65 kg stands in an elevator. The elevator initially accelerates uniformly for 1.8s followed by a period of a constant velocity of 2.5ms^-1 and then a final uni
Log On
Question 1203140: A man with a mass of 65 kg stands in an elevator. The elevator initially accelerates uniformly for 1.8s followed by a period of a constant velocity of 2.5ms^-1 and then a final uniform deceleration for 1.8s.
a)Calculate the magnitude of the reaction force on the man from the elevator floor during the time it takes the elevator to come to rest.
b) The man uses the elevator again to travel to a lower floor. The elevator descends at the same speed and comes to rest in the same time as in (a). Calculate the reaction force on the man from the elevator floor during the time it takes to come to rest on the floor below.
c) Suggest and explain during the deceleration period, which direction of elevator travel would make the man feel
(i) lighter
(ii)heavier
d) In a stroke of bad luck, the elevator cable snaps and it falls freely under gravity. During the fall, the man experiences a sense of weightlessness.
Explain, using appropriate laws of motion, why the man feels a sense of weightlessness in this situation.
