A pulley system can

a. change the direction of a force.

b. multiply the force.

c. increase the amount of work done.

d. both a and b

e. both b and c

To create hydrogen and oxygen from water you would need to perform which type of reaction

The first device Faraday invented based on Ørsted's observation was the motor. What did this device do?

What are the four forms that water takes when it returns to earth from the clouds?

1. Visible light has a higher frequency than infrared light. True / False? 2. Each color of visible light corresponds to a different wavelength of electromagnetic rays. True / False? 3. Ultraviolet light has a higher frequency than visible light.

3. Identify three elements and three compounds. How are they similar? How are they different?

What must be your car's average speed in order to travel 235km in 3.25 hours?

At a certain location, the horizontal component of the earth's magnetic field is 2.5 * 10-5 T, due north. A proton moves eastward with just the right speed for the magnetic force on it to balance its weight. Find the speed of the proton.

An acrobatic airplane performs a loop at an airshow. The centripetal acceleration the plane experiences is 14.7 m/s2. If it takes the pilot 45.

Which of the following was NOT an outcome of Bacon's rebellion? A. A more direct focus on the "Indian Problem" B. A more focused plain to isolate black slaves from white servants C.

A science class did an investigation to see how many breaths it took for each student to blow up a balloon. Jason blew up his balloon with the fewest breaths. Which of these might explain why Jason took fewer breaths to blow up his balloon? A.