A force that opposes motion between surfaces that are touching

A car of mass m=1000kg is traveling at speed v and brakes. The skid marks are 20m long and the coefficient of kinetic friction is. 5. Find the speed v in m/s and in mph. How would your answer change if the mass of the car were 2000kg?

A block of 250-mm length and 54 * 40-mm cross section is to support a centric compressive load P. The material to be used is a bronze for which E = 95 GPa.

To what temperature would you have to heat a brass rod for it to be 1.8 % longer than it is at 30 ∘c?

5.85 m/s accelerates at 2.35m/s for 3.25s

What is the difference between magnitude and intensity

Which of the following subatomic particles does not have a charge? A.) electron B.) proton C.) neutron D.) positron

How do we use light in space?

What units are used for gravitational potential energy? Write the name, not the symbol.

A 7.5 kg block is placed on a table. If it's bottom surface area is 0.6m2, how much pressure does the block exert on the tabletop? A. 376.5 Pa B. 73.5 Pa C. 226.5 Pa D. 122.5 Pa

A boulder of mass 2000 kg is at the top of a cliff of height 220 m. Determine how fast the boulder will be moving when it strikes the dirt below.