Muscles in animals are often found in pairs, because

A. muscles can only produce a force as they relax.

B. muscles can only pull.

C. muscles need to be able to both push and pull.

D. muscles can only push.

An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of + 10 µC that does not touch the conductor. There are no other charges in the vicinity. Which statement about this conductor is true?

Two objects of different masses are sitting on different balance scales. Object A has a greater mass than object B. How will the weights of the objects compare to each other? The weights of the objects will be the same.

Size AA modern NiMH rechargeable batteries have a maximum capacity of 2050 mAh and the emf equal to 1.20 V. A flashlight has three such batteries connected in series. The 3.6 V bulb takes 0.33 A.

Find the acceleration of an 800-kg car that has a net force of 4,000 N acting upon it.

d) To calculate air pressure, the volume occupied by air is assumed constant. Why is this incorrect? Explain how the vapor pressure calculated and the resulting Clausius-Claperon plot are affected?

The weight of a 100 N laser printer is spread over 0.5m2. What is the pressure it exerts? A) 50 N/m2 B) 200 N/m2 C) 500 N/m2

Comparing and contrasting ionic and covalent bonds?

Elevation above sea level is called

The train traveled 500 kilometers north to Odessa in 2 hours. What's the train's speed? What is the velocity?

Are microwaves and radio waves faster or slower than other types of electromagnetic energy?