A 67 kg astronaut floating in space throws a 4.2 kg rock at 5.6 m/sec. How fast does the astronaut move backward?

How much heat is needed to raise the temperature of 8g of water by 18oC?

If you wanted to learn more about the universe, what would you study? a. life science b. logic c. philosophy d. physical science

An inclined plane wrapped around a cylindrical post is in what?

To recharge your cell phone you plug it into an electrical outlet for several hours. The electrical energy is stored as ___ energy until you are ready to use the phone. A. radiant B. thermal C. nuclear D. chemical

Medical x-rays, with a wavelength of about 10^ (-10) m, can penetrate completely through your skin. a. Ultraviolet rays, which cause sun burn by penetrating only the top level of skin, have a wavelength about 1,000 times the wavelength of an x-ray.

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is pulled A. gravity pulls very hard on the milk carton. B. the milk carton has very little weight. C. the milk carton has inertia. D.

What is concave mirror

Two boxes are suspended from a rope over a pulley. each box has weight 50 n. what is the tension in the rope

What happens when you put a galvanized zinc nail in copper solution for an hour? Does is rust or turn different color? What is the outcome? What happens after an hour in vinegar?

Psuedopod in a sentence