A runner makes one lap around a 200m track of 25 s. What were the runner's (a) average speed and (b) average velocity?

Using a simple machine, a student is able to lift a 500N weight by applying only 100N. What is the mechanical advantage of the simple machine? A) 0.2 B) 1 C) 5 D) 50000

Imagine a box sitting on a shelf. What forces are acting on the box? A. both gravity and normal B. normal C. gravity D. none of the answers are correct

How do the forces in nuclear and chemical reactions differ? A. Both reactions only need to overcome weak electrostatic forces. B. Chemical reactions must overcome the strong nuclear force. C. Nuclear reactions must overcome much stronger forces. D.

Allison (of mass 20 kg) is coasting in her wagon (of mass 20 kg) at a constant velocity of 7 m/s. She passes her mother, who drops a bag of toys (of mass 2 kg) into the wagon. What will happen to the speed of the wagon?

By which method does heat travel from the sun to Earth? A. Conduction B. Convection C. Evaporation D. Radiation

A 25 kg girl steps off a diving platform that is 2 m high. Neglecting the effects of friction, what is the girl's speed just before she hits the water? A. 2.0 m/s B. 6.3 m/s C. 39 m/s D. 490 m/s

What three ways does the respiratory system modify air before it reaches the lungs?

Newton's First Law of Motion states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force change the motion. This is sometimes called the law of

In which type of wave is energy transferred through the vibration of particles?

What objects are found in the sloar system solar system