Carlos uses a rope to pull his car 30 m to a parking lot because it ran out of gas. if carlos exerts 2,000 n of force to pull the rope, and the rope is at an angle of 15° to the road, how much work did he do? round your answer to two significant figures. 1.6 × 104 j 3.5 × 104 j 5.8 × 104 j 9.0 × 104 j

As shown in fig. p3.64, a closed, rigid tank fitted with a fine-wire electric resistor is filled with refrigerant 22, initially at 2108c, a quality of 80%, and a volume of 0.01 m3. a 12-volt battery provides a 5-amp current to the resistor for 5 minutes. if the final temperature of the refrigerant is 408c, determine the heat transfer, in kj, from the refrigerant.

Wavelength, frequency, and energy are related. what happens to a wave as it’s wavelength gets shorter?

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve