Which of the following actions does not increase friction?

a. Threading tires

b. Grinding on stones

c. Making spikes on shoes

d. Powdering a carom board.

Preston tossed a red ball upward and it reaches a maximum height of 3.0. What is the final velocity when it returns to prestons hand?

How can pieces of rock in contact with a stream bed move?

As you found in Part A, your weight will be greater than normal when the elevator is moving upward with increasing speed.

At lunch, the babysitter gives Tanya and Damien each a chocolate candy. Tanya puts her candy on her plate. Damien saves his candy in his pocket. After lunch, Damien discovers his candy has melted.

If you were to double the width of a single slit, by how much would you change the width of the central maxima?

A 2 kg book is pushed across a table is a force 4. Assuming no friction, what is the acceleration of the book?

When electricians use wiring for houses they use both copper and rubber. Which do you think is used as a conductor?

Suppose that 600 W of radiation in a microwave oven is absorbed by 250 g of water in a very lightweight cup. Approximately how long will it take to heat the water from 20 C to 80 C? (A) 50 s (B) 100 s (C) 150 s (D) 200 s

Calculate the velocity of a 1650kg satellite that is in a circular orbit of 4.2 x 10^6m above the surface of a planet which has a radius 3.95 x 10^5 m and the period of the orbit is 2.0 hours.

A "conventional gear" tailwheel airplane has the center of mass aft of the two main wheels and a smaller, third wheel at the tail. a "tricycle gear" airplane has the center of mass forward of the two main wheels and the third wheel near the nose.