A garage door opener has a power rating of 350 watts. If the door is in operation for 30 seconds, how many joules of energy are used? (Hint: Remember that 1 watt = 1 joule/sec)

You and two friends apply a force of 425 N to push a piano up a 2.0 m long ramp. If lifting the piano straight up requires 1700 N of force, what is the mechanical advantage of the ramp?

What is a consequence of the second law of thermodynamics? - Activation energy from the environment is required for every energy transfer. - Energy cannot be created or destroyed but it can be transferred.

A conical container of radius 6 ft and height 24 ft is filled to a height of 19 ft of a liquid weighing 64.4 lb divided by ft cubed.

Object A has a mass of 100 grams, and object B has a mass of 150 grams. They are both traveling at the same velocity. Which can you conclude

If the velocity of a moving object doubles, then what else doubles?

The size particles in a solution is about 1nm (1nm = 0.000000001 m). Write 0.000000001m in scientific notation.

You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. What power does the pirate supply?

Fills the region around a magnet

A tiny 0.0250 - microgram oil drop containing 15 excess electrons is suspended between to horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces. The plates are both circular with a radius of 6.50cm.

In double-blind studies neither the test subject or the researcher knows who was given the drug and who was given the control.