Two magnets rest on a table. Because like poles of a magnet repel each other, the magnets exert a force on each other. If Magnet 1 is moved closer to Magnet 2, Magnet 2 will move. This is because– (A)objects need to touch each other in order to cause movement.

(B)magnets can only exert a force on other magnets.

(C)changing the positions of the magnets changed the energy of the system.

(D)moving Magnet 1 changed the force needed to move Magnet 2.

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.

What is the mass of the water that is being heated? it requires 2,500 joules to raise a certain amount of water (c = 4.186 jig c) from 20.0°c to 60.0°c. o 159 o 40 g o 63 g o 80 g