How fast must a 70 kg student be running to have a kinetic energy of 568 J?!

You are in a canyon and yell across. It takes 4 seconds for the echo to come back to you. How wide is the canyon?

If a car travels 60 mi. north for one-half hour, 100 mi. west for one hour, and 60 mi. south for 30 minutes, what is the total displacement of the car? 100 220 0 Is The direction N, S, E, W, or N/A

A book has a mass of 50 grams and an acceleration of 5 m/s/s. What is the force on the book? 220 N 20 N 250 N 10 N

What is law of conservation of mass

superman lived on another planet where the acceleration due to gravity is 23.6 m/s^2. if a woman falls from a building that is 65m tall, how long he have to save her before she hits the ground

Two persons are applying forces on two opposite sides of a moving cart. The cart still moves with the same speed in the same direction. What do you infer about the magnitudes and direction of the forces applied?

SI unit of mass and gravity

What is the difference between porosity and permeability

In the diagram below, the planets' relative distances from the Sun are shown. The sizes of the planets are not drawn to scale.

Should athletes be benched if their grades are too low, or should they be allowed to play anyway?