A man of mass 80 kg stands in an elevator.
Calculate his apparent weight when,
(i) elevator is at rest

A man of mass 80 kg stands in an elevator. Calculate his apparent weight when, (ii) elevator is uniformly accelerated upwards at 2 m//s^2

A man of mass 80 kg stands in an elevator. Calculate his apparent weight when, (iv) the elevator cable breaks (g = 10 m//s^2)

A man of mass 80 kg stands in an elevator. Calculate his apparent weight when, (iii) downwards with 2 m//s^2 acceleration

A person of mass 60 kg stands on a weighing scale in a lift (elevator). What would the scale read if the elevator moves (i) up with a uniform speed of 5 m//s (ii) down with a uniform acceleration of 4 m//s^2 (iii) up with a uniform acceleration of 4 m//s^2 ? [Given : g = 10 m//s^2 ]

A flywheel of mass 4 kg has radius of gyration 0.4 m. Calculate the kinetic energy of rotation when it makes 5 r.p.s

A person standing on the floor of an elevator drops a coin. The coin reaches the floor in time t_1 if the elevator is at rest and in time t_2 if the elevator is moving uniformly. Then

A man weighing 80 kg is standing on a trolley weighting 320 kg . The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley along the rails at speed 1 m//s (w.r.t. to trolley) then after 4 s his displacement relative to the ground will be :

Two persons of masses 55 kg and 65 kg respectively are at the opposite ends of a boat. The length of the boat is 3.0 m and weights 100 kg . The 55 kg man walks up to the 65 kg man and sits with him. If the boat is in still water the centre of mass of the system shifts by.

Two bodies of masses 2 kg and 4 kg are connected at the two ends of a string of negligible mass that passes over an ideal pulley (i. e., of negligible mass and friction). Calculate (i) the acceleration of the system (ii) the tension in the string. [Given: g = 10 m//s^2 ]

Solve the following examples: A man carrying a box of mass 20 kg climbs up to a height of 1m in 40s. Calculate the power delivered by him to the box.