A 200 N box is pushed up an incline that is 5.00 m long and rises 1 m. If the incline is frictionless, then the work done by the pushing force is
A. 336 J.
B. 305 J.
C. 275 J.
D. 200 J.
E. 157 J.
D. 200 J.
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As a spaceship nears an event horizon, a clock on the spaceship will be observed
A) to run faster. B) to run the same as one on Earth. C) to stop. D) to run backwards. E) to run slowly.
Air flows through a 1 cm diameter tube at 8 m/s. The air is at 40ºC and the tube is 100ºC. If the tube is 3.5 m long determine, a) the entrance length for developed flow and b) heat transfer to the air.
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
Einstein’s photon model is consistent with the results of two-slit interference experiments involving light.
Most stars radiate much like black bodies. Consider two stars having the same surface temperature, the second having 10 times the diameter of the first. The power radiated per unit area is
A) 102 times larger for the 2nd. B) 10 times larger for the 2nd. C) the same for both. D) 104 times larger for the 2nd. E) 108 times larger for the 2nd.