What type of system allows matter and energy to enter and exit?

A. Connected

B. Isolated

C. Closed

D. Open

What is a lever used for?

Consider two wires made of copper. They have the same diameter but one of them has three times the length of the other. Choose the correct statement: a. Both wires have the same resistivity b.

Which of the following is NOT an example of work? a. a windmill turning in the wind b. a person sliding a box across the floor c. a metal bar bracing a leaning brick wall d. an air bag deploying in an automobile wreck

Is it necessary for humans to die?

You want to use the T568A standard to add connectors to your Cat5 cable. Starting with pin 1, which order should you use for the wires within the connector?

What holds the atoms together in a covalent bond

The sun is the centermost star of our solar system. a. True b. False

When an electron moves from a lower to a higher energy level

Which of the following is all matter made of? A. Hot particles B. Cold particles C. Constantly moving particles D. Nonmoving particles

Which of the following has longest wavelength, a) blue light b) red light c) x-rays d) gamma rays?