What are the two forces involved when a machine is used?

-friction and density

-potential and kinetic

-input and output

-gravity and friction

A flashlight beam makes an angle of 60 degrees with the surface of the water before it enters the water. in the water what angle does the beam make with the surface? (nwater = 1.33) a. 22o b. 0o c. 30o d. 60o e. 68o

Watt-hours is a measure of energy, just like kilowatt-hours. How can you convert this to Joules?

What is the gravitational torque on the beam about an axis through the hinged end when the beam is at the upper position?

A brick weighs 26 N. Measured underwater, it weighs 11 N. What is the amount of buoyant force exerted by the water on the brick?

Scientists use sonar machines in order to map the contour of the ocean floor. The data from the sonar machines make a model of the ocean floor. What information can be obtained from this model? A. what sort of organisms live near the ocean floor B.

A 82 kg football player encounters a 427 kg m/s impulse. How much does the players velocity change?

A 0.5 kg tennis ball has speed of 15m/s. what is the kinetic energy of tennis?

What has affected almost every aspect of modern sports? O A. technology OB. injuries OC. politics OD. weather

Rachel is making cookies. She pours 1/2 cup of oil into a bowl, followed by 1 cup of water. The oil rises to the surface of the bowl. Why?

Two particles collide, one of which was initially moving and the other initially at rest. Is it possible for both particles to be at rest after the collision?