What is the change in internal energy if 20 J of heat is released from a system and the system does 50 J of work on the surroundings?

A.-80 J

B.-20 J

C. 80 J

D. 20 J

A generator transforms a. potential energy into kinetic energy. b. mechanical energy into electrical energy. c. magnetic energy into electrical energy. d. friction into electrical energy.

An axe blade is an example of which simple machine

Of the following, which information is needed to determine the horizontal distance a projectile travels? Check all that apply. A. The projectile's vertical acceleration B. The angle of the projectile's initial velocity C.

How much energy in calories does it take to melt 10 grams of ice?

What causes the mechanical advantage of the inclined plane to be less than that of the liver

You and your housemate have an argument over the cost of the electric bill. You want to turn off the outside porch light before going to bed each night.

Work is a product of A force and distance B force and heat energy C cause and heat energy D cause and effect

An exploration submarine should be able to descend 1200 m down in the ocean. If the ocean density is 1020 kg/m3, what is the maximum pressure on the submarine hull?

Why cooking pans don't have have metal handles?

Why will marchers at the end of a long parade following a band be out of step with marchers nearer the band