The water flowing over Niagara Falls drops a distance of 50. m. Assuming that all the gravitational energy is converted to thermal energy, by what temperature does the water rise?
What will be an ideal response?
0.12°C
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Car J moves twice as fast as car K, and car J has half the mass of car K. The kinetic energy of car J, compared to car K is
A) 4 to 1. B) 2 to 1. C) the same. D) 42to 1. E) 1 to 2.
Refer to Figure 6-13. Block A has a mass of 3.00 kg, block B has a mass of 5.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the acceleration of the masses?
A. 4.20 m/s2 B. 4.71 m/s2 C. 1.86 m/s2 D. 2.94 m/s2 E. 0.981 m/s2
A projectile that is fired vertically from the surface of Earth at 8 km/s will
A) go into circular orbit about Earth. B) rise and fall back to Earth's surface. C) follow an uncertain path. D) escape from Earth.
The far side of the Moon
a. has never been seen. b. has more craters than the near side. c. looks just like the near side. d. is always dark.