Amelia wanted to measure the mass of an object. Which SI unit should she use? A. kg B. amp C. mL D. K

Which was more difficult to determine (latitude or longitude) and why?

Name three devices that use electricity and magnetism to operate.

One has a frequency of 490 Hz and the other is 488 Hz. How many beats per second are heard?

A distance of 2.00 mm separates two objects of equal mass. If the gravitational force between them is 0.0104 N, find the mass of each object.

Why is it difficult to test the efficacy of biofeedback using experimental techniques? A. It is difficult to devise a control treatment that replicates biofeedback. B. Biofeedback cannot be subjected to testing because it is pseudoscience. C.

Which of the following best characterizes the free energy change ΔG for an endothermic reaction under physiological conditions? A. The sign of ΔG is positive B. The sign of ΔG is zero C. The sign of ΔG is negative D.

In a recent hockey game, one player (m=100kg) was moving at a velocity of 8 m/s when he ran into another player (m=300kg) who was at rest (v=0m/s). After the collision, the two players were stuck together (moving with the same velocity).

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova

When a car turns a corner on a level road, which force provides the necessary centripetal acceleration? 1) gravity 2) normal force 3) air resistance 4) tension 5) friction