In order to change water from a solid to a liquid, energy must be

a. removed

b. created

c. added

d. destoryed

Which of the following is an expressipn of velocity? O A. 55 mi north O B. 55 mph O C. 90 km O D. 90 km/h north

It is known that heat is added to a gas in sealed container. The container is fitted with a moveable piston. a. The temperature of the gas decreases. b. The temperature of the gas increases. c. The temperature of the gas remains the same. d.

Nearly all liquids and solids are nearly opaque to radiation at nearly all wavelengths. why is that

Which characteristic of a light wave must increase as the light wave passes from glass into air

As the human population grows, what happens to our natural-resource requirements? a. They increase. b. They decrease. c. They do not change. d. They go in cycles.

Was ruthersfords model of an atom incorrect or incomplete

Which sphere is NOT a part of the cycling of oxygen through Earths systems?

A transformer has a primary coil with 700 turns and a secondary coil with 350 turns. If the output voltage is 410 volts, what is the input voltage? * a.) 245,000 Volts b.) 205 Volts c.) 2 Volts d.) 820 Volts

Your odometer of your car says 54 123 miles when you start your trip, your watch says 9 45 AM When you get to your estination the odometer says 54 miles and your watch says 11 45 AM What is your average velocity (assuming you were traveling due

Briefly explain how an electric motor works.