A child is sledding. He starts at the top of the hill with a velocity of zero, and 3 seconds later he is speeding down the hill at 12 meters per second. What is the child's acceleration?

An 800-N billboard worker stands on a 4.0-m scaffold supported by vertical ropes at each end. If the scaffold weighs 500 N and the worker stands 1.0 m from one end, what is the tension in the rope nearest the worker?

A water pump pumps 3 kg of water every second from the bottom of a well to the top of the well 50 m above if the pump used 2000 W of electrical power to accomplish the task what is the efficiency of the pump

12) There are three ways to give an object a static charge. They are friction, conduction and induction. Two pieces of cellophane tape are stuck to a lab table. Each piece is quickly ripped off the table.

Which of the following measurements involve a direction? (select all that apply) A. acceleration B. speed C. Time D. Displacement

What are these four ways? Check all that apply. Check all that apply. Two resistors in parallel can be placed in series with the third. Three resistors in parallel can be placed in series with the net resistance.

What kind of friction is shown between the skydiver and the air?

When charging an object by conduction, what happens to the charges in the object? A. Electrons move, giving the object a static charge. B. The object is forced to generate extra electrons because of the electric field. C.

If an atom has 5 protons and 6 electrons it's charge

N object moves in a circular path at a constant speed. what is the relationship between the directions of the object's velocity and acceleration vectors?

Explain what force caused the continents to move from one super continent to there current form