An elevator is on the twentieth floor. It goes down 11 floors and then up 5 floors. What floor is the elevator on now?

A lift is on the ground floor. If it goes 5 floors down and then moves up 10 floor from there, then in which floor will the lift be?

The force exerted by the floor of an elevator on the foot of a person standing there is more than the weight of the person if the elevator is :

An elevator is descending with uniform acceleration.To measure the acceleration, a person in the elevator drops a coin at momen the elevator strts. The coin is 6 ft asbove the floor of the elevator at the time it is dropped. The person observes that the coin strikes the floor in 1 second. Calculate these dta the acceleration of the elevator.

In a three-storey building, there are four rooms on the ground floor, two on the first and two on the second floor. If the rooms are to be allotted to six persons, one person occupying one room only, the number of ways in which this can be done so that no floor remains empty is a. "^8P_6-2(6!) b. "^8P_6 c. "^8P_5(6!) d. none of these

A person standing oin the floor of an elevator drops as coin. The coin reaches the floor of the elevator in a time t_1 if the elevator is stationary and in the t_2 if it is moving uniformly. Then

A metre stick is is held verticaly with one end on a rough horizontal floor. It is gently alowed to fal on the floor. Assuming that the end ast the floor does not slip find the angular speed of the rod when it hits the floor.

A bolt of mass 0.3 kg falls from the ceiling of an elevator moving down with a uniform speed of 7ms^(-1) . If hits the floors of the elevator (length of the elevator 3m) and does not rebound. What is the heat produced by the impact?

A block of mass m slips on a rough horizontal table under the action of horiozontal force applied to it. The coefficient of friction between the block and the table is mu . The table does not move on the floor. Find the total frictional force aplied by the floor on the legs of the table. Do you need the friction coefficient between the table and the floor or the mass of the table ?