Which is an example of projectile motion?

a person throwing a rock

a child swinging on a swing set

an athlete running on a track

a teacher picking up a pencil

A 4,000-kg car traveling at 20 m/s hits a wall with a force of 80,000 N and comes to a stop. What was the impact time?

An 8.0 kg cat is running 4.0 m/s. How much kinetic energy does it have?

A motor is powered by a battery with an energy capacity of E_{battery} = E battery = 1 WHr (1 WHr = 3600 Joules). The motor sits at the top of a concrete ramp and is connected to a cable that is used to pull a 68.

Why is steel wool flammable

The positions of a satellite in elliptical orbit are indicated. Rank these quantities from greatest to least: Gravitational Force A) Speed B) KE C) PE D) momentum

A horse canters away from its trainer in a straight line, moving 37 m away in 9.1 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate its average speed for the entire trip. Express your answer using two significant figures.

An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 7000 N {/rm N}.

What are the components of earths life support system

A car is moving with a velocity (3.0 m/s) € x ˆ + (1.0 m/s) € y ˆ and 3.0 seconds later its velocity is (6.0 m/s) € x ˆ - (3.0 m/s) € y ˆ. What is the direction of the average acceleration of the car?

When water vapor condenses on the inside of a window, the window becomes