200 kg elevator in the Physics department is at REST on the ground floor whilst being suspended by a thick steel rope with tension, T. The elevator now accelerates upwards at 4 m/s/s. During this upward acceleration, the rope

A person stands on a scale inside an elevator at rest. The scale reads W= 666N . The elevator accelerates upward momentarily at the rate of a= 4 m/s2   What does the scale read then?

On a separate occasion, Michael threatened to jump from the roof of hisoffice building as a demonstration of seasonal depression. If it takes 1.2seconds for his body to plummet to the ground,a. How fast will he be going when he reaches the ground?b. How far will he have fallen in meters?c. In feet?d. If Michael weighs 185 lbs, what would his force of collision with theground be, in Newtons, if his sudden deceleration upon impact takes0.1 seconds? ( 1 lb = 4.45 N, which means on Earth, a weight of 2.2lbs corresponds to a mass of 1 kg)

how to solve?

You've seen a movie at some time when there were skydivers falling through the air, spread out, doing their tricks.  At times there are many falling together.  They look like they're barely moving.  How fast are they actually moving through the air, typically? (your source?)  If they're moving that fast, how can they hook up and touch each other without getting hurt?  Finally someone pulls the cord to open their chute and ...zip! Up they go.  Does a skydiver go up when their chute opens like it looks in the movies?  What's going on?

Suppose you have a 148 kg wooden crate resting on a wood floor, with coefficient of static friction 0.500 between these wood surfaces. (Enter the magnitudes.)   A.)What maximum force (in N) can you exert horizontally on the crate without moving it?   B.)If you continue to exert this force once the crate starts to slip, what will its acceleration (in m/s2) then be? The coefficient of sliding friction is known to be 0.300 for this situation.

A 50.0-kg bucket is being lifted by a rope. The rope will not break if the tension is 700 N or less. The bucket started at rest,and after being lifted 5.0 m, it is moving at 4.0 m/s. If the acceleration is constant, is the rope in danger of breaking? b.Sum the forces using Newton’s second law c. Determine the force in the rope over the 5.0m distance. (Hint: you may need to solve for the acceleration separately first sing one of your favorite kinematic equations.)

A 7 kg mass is placed on a table with Ms= 0.18 and Mk= 0.15. How much mass must be suspended on m in order to start the 5 kg moving? What is the resulting acceleration? This is basically the situation we set up in Lab several times…... a pulley system is placed such that the weight of mass 2 will pull horizontally to the table the 7 kg is placed upon.

A car of mass m=1000 kg starts moving from rest at a point Aon a smooth horizontal surface. The car moves under theaction of an engine force �⃗ of magnitude F=2000 N and ofdirection parallel to the surface. It reaches point O that is 70 maway from A, with a velocity �⃗!.a. Draw the free body diagram of the car.b. Using the Second Law of Newton, determine the acceleration of the car.c. Calculate the normal force acting on the car.d. Calculate the final velocity at O.

The horizontal position of a 4500-N car driving down a long, flat, straight road is given by the following formula, where t is measured in seconds. x(t) = (1.2 m/s³) t³ - (1.8) ² a. Use the weight of the car to find its mass. b. What is the x-component of the car's velocity, as a function of time? c. What is the x-component of the car's acceleration, as a function of time? d. What is the x-component of the net force acting on the car at time t = 0.50 s, t = 1.0 s, and t = 1.5 s?