A system is acted on by its surroundings in such a way that it receives 50 J of heat while simultaneously doing 70 J of work. What is its net change in internal energy?
a. 70 J
c. zero
b. -20 J
d. 20 J
B
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Most meteorites collected on Earth are of the rocky primitive variety, although most asteroids are of the carbon-rich variety
Indicate whether the statement is true or false
A 2.0-kg object moving with a velocity of 5.0 m/s in the positive x direction strikes and sticks to a 3.0-kg object moving with a speed of 2.0 m/s in the same direction. How much kinetic energy is lost in this collision?
A. 2.4 J B. 9.6 J C. 5.4 J D. 0.6 J E. 6.0 J
A diver shines light up to the surface of a flat glass-bottomed boat at an angle of 30° relative to the normal. If the index of refraction of water and glass are 1.33 and 1.5, respectively, at what angle (in degrees) does the light leave the glass (relative to its normal)?
a. 26 b. 35 c. 42 d. 22 e. 48
Describe a lunar eclipse
What will be an ideal response?