A50 kg person is at the shopping mall. he rides an elevator up 5 m, walks 40 m to an escalator, and rides the escalator back to the ground floor traveling 5 m vertically and 5 m horizontally.
a.) what work is done by the normal force in the elevator? by gravity?
b.) what is the total work done in the elevator?
c.) what work is done by the normal force along the concourse? by gravity?
d.) what is the total work done along the concourse?
e.) what work is done by the normal force on the escalator? by gravity? f.) what is the total work done on the escalator?

According to newton's second law, when the same force is applied to two objects of different masses, a the object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration, b. the object with greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration, c. the object with greater mass will experience a greater acceleration, and the object with less mass will experience a smaller acceleration, d. the object with greater mass will experience a small acceleration, and the object with less mass will experience an even smaller acceleration.

What occurs during a combustion reaction

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?