Two masses collide and stick together. Before the collision, one of the masses was at rest. Is there a situation in which the kinetic energy is conserved in such a collision?
a. Yes, if the less massive particle is the one initially at rest.
b. Yes, if the more massive particle is the one initially at rest.
c. Yes, if the two particles have the same mass.
d. No, kinetic energy is always lost is such a collision.
D
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Water at 20°C is transported in a 10-cm-diameter cast iron horizontal pipe at a flow rate of 0.02 m^3/s. The pressure drop over 100 m of the pipe is nearest:
(A) 97 kPa (B) 84 kPa (C) 62 kPa (D) 51 kPa
This figure illustrates Joule's apparatus for determining the equivalence of work and heat. The paddles inside the cylinder are connected via pulleys to a weight (yellow). As the weight falls, the paddle wheel turns, and the water's temperature goes up. If the weight falls rapidly and hits the table on which the apparatus is resting, what goes wrong with the measurement? (Hint: See page 256 to
read more about this scenario.) a. It would cause some of the water to spill. b. Some of the energy would be transmitted in the form of heat to the table instead of the water. c. The paddles must turn slowly to transmit energy to the water. d. The weight must move slowly to do all the work it can.
Comets belong to the ________.
A. dwarf planets and Asteroid belt B. Asteroid belt and Kuiper belt C. Kuiper belt and Oort cloud D. Oort cloud and dwarf planets E. None of these choices is correct.
What extrasolar planet discoveries were initially surprising?
A) Jupiter-like planets orbiting very close to their stars B) planets with large eccentricities C) systems with only one planet D) A and B E) A and C F) B and C