36. What is the difference between mas and weight? On earth, what is the weight

Question

36. What is the difference between mas and weight? On earth, what is the weight of a 1 kg mass?

37. When your textbook says that the moon "falls around the earth," does it mean that the moon will eventually fall from the sky and hit the earth? If not, what does it mean?

38. On a winter day, is it scientifically correct to say that the inside of your house is chilly because "cold seeps through the windows from outside"? Why or why not? What might you say instead?

39. Can sound travel through a vacuum? Why or why not?

40. A. A circuit has a resistance of 4 ohms and a potential difference of 8 volts across it. What is the current in the circuit? (Presume the circuit obeys Ohm's law.) Show your calculations.

40. B. How much power does the circuit in part A draw? Show your calculations.

Explanation / Answer

36. Mass is the amount of matter in an object. Weight is how much gravity is acting on the object. 1kg = 9.8N on Earth.

37. The moon will not hit Earth. It is constantly falling, but around, not towards.

38. Heat energy moves from high to low. Inside your house begins as warmer than outside. It diffuses through the windows because single paned glass is not a good insulator.

39. It cannot. Sound is particle vibration. No particles in a vacuum. Therefore, no sound.

40a. V=IR ---> (8) = I*(4) ---> I = 2 A

40b. P = IV ---> P = (2A)(8V) = 16W

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