Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. What is their separation after the heavier astronaut has moved 12m?
A) 9.0 m
B) 16 m
C) 21 m
D) 24 m
E) 28 m
E
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In which system is heat usually transferred from the cooler part to the warmer part?
a. a stove as it heats up water b. a refrigerator that is running c. an electric fan that is running d. none of the above, because it is impossible to transfer heat in this manner
Matter Waves: What is the de Broglie wavelength of a ball of mass 200 g moving at 30 m/s? (h = 6.626 × 10-34 J ? s)
A. 1.1 × 10-34 m B. 2.2 × 10-34 m C. 4.5 × 10-28 m D. 6.7 × 10-27 m
A water hose has a flow rate of 3.0 kg/s of water. If the velocity of the water as it leaves the hose is 5.0 m/s, then the force to hold the hose is
A. 15 N. B. 26 N. C. 30 N. D. 45 N. E. 57 N.
A particle with a half integer spin is a
a. boson b. lepton c. fermion d. hadron e. muon