21. What is the formula for displacement?

An object is moving velocity 23m/s. It accelerates to a velocity of 85m/s over a time of 8.3s. What acceleration did it experience?

A glass rod, a piece of silk, and a piece of cat's fur are all initially uncharged. First, the silk and glass are rubbed together. Next, the glass and fur are rubbed together.

A wire of resistivity ρ must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire mustA - be four times the original diameter.

There are six books in a stack, and each book weighs 5 N. The coefficient of static friction between the books is 0.2. With what horizontal force must one push to start sliding the top five books off the bottom one? a. 1 N c. 3 N b. 5 N d. 7 N

You give a shopping cart a shove down the aisle. The cart is full of groceries and has a mass of 18 kg. The cart accelerates at a rate of 3 m/s2. How much force did you exert on the cart?

How did Einstein's and Newton's theories differ in terms of explaining the cause of gravity?

A sled being dragged to the right across loosely packed snow with a rightward acceleration

Imagine two artificial satellites orbiting earth at the same distance. one satellite has a greater mass then the other one which of the following would be true about there motion? 1.

What is energy? (Not the answer from google search.)

Explain why the friction force between two surfaces increases if the force is pushing the surfaces together increases.