If a car changes its velocity from 32 km/hr to 54 km/hr in 8.0 seconds, what is its acceleration?

216 km/hr/sec

2.8 km/hr/sec

-216 km/hr/sec

-2.8 km/hr/sec

To practice Problem-Solving Strategy 15.1 Mechanical Waves. Waves on a string are described by the following general equation y (x, t) = Acos (kx-ωt). A transverse wave on a string is traveling in the + x direction with a wave speed of 8.

What average net force is required to accelerate a 9.5 g bullet from rest to 650 m/s over a distance of 0.85 m along the barrel of a rifle?

Why is flammability a chemical property?

Air is forced through the water to remove gases is called?

What gauge pressure is required in the city water mains for a stream from a fire hose connected to the mains to reach a vertical height of 13.0 m? (Assume that the mains have a much larger diameter than the fire hose.)

An apple drops from a tree and hits the ground in 1.5s what is its speed just before it hits the ground?

Sound travels slow in cold air. Why does the speed of sound depend on air temperature?

A tow truck pulls a 500 kg car so that the car accelerates 2 m/s2. What is the net force on the car? 250 N 498 N 1000 N 502 N

Which force keeps you near earths surface?

Name one process that requires a force in the human body.