Ideal Gas Law: A laboratory vacuum pump can reduce the pressure in a chamber to 1.0 × 10-7 Pa. If the volume of the chamber is 0.500 m3 and the temperature is 27°C, how many molecules are left inside the chamber? (NA = 6.022 × 1023 molecules/mol, R = 8.31 J/mol ? K)
A. 1.2 × 1013
B. 2.4 × 1013
C. 1.2 × 1012
D. 2.4 × 1012
E. 1.2 × 1014
Answer: A
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Impulse: A super dart of mass 20 g, traveling at 350 m/s, strikes a steel plate at an angle of 30° with the plane of the plate, as shown in the figure. It bounces off the plate at the same angle but at a speed of 320 m/s. What is the magnitude of the impulse that the plate gives to the bullet?
A. 0.52 N ? s B. 4.3 N ? s C. 300 N ? s D. 6.7 N ? s E. 0.30 N ? s
A yellow candle flame reflects from opposite surfaces of a piece of red glass
A) both images are yellow B) one image is yellow and the other red C) both images are red D) both images are reddish yellow
A boat is floating in a small pond. The boat then sinks so that it is completely submerged. What happens to the level of the pond?
a. It increases. b. It decreases. c. It stays the same. d. In some cases it would decrease, in others it would stay the same. e. In some cases it would increase, in others it would stay the same.
A brass bar twisted by torques T acting at the ends has the follow- ing properties: L 5 2.1 m, d 5 38 mm, and G 5 41 GPa. The torsional stiffness of the bar is approximately:
(A) 1200 N?m
(B) 2600 N?m
(C) 4000 N?m
(D) 4800 N?m