You're driving in a car at 50 km/h and bump into a car ahead traveling at 48 km/h in the same direction. The speed of impact is
A) zero.
B) 2 km/h.
C) 48 km/h.
D) 50 km/h.
E) 98 km/h.
Answer: B
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A heavy block at rest is suspended by a vertical rope. When the block is raised at constant velocity, the rope tension
A) is less than its weight. B) equals its weight. C) is greater than its weight.
Green light has a shorter wavelength than orange light. In a 5-inch telescope, green light will:
A) provide better angular resolution than orange light. B) come to the same exact focus as orange light. C) provide worse angular resolution than orange light. D) allow dimmer stars to be observed. E) reduce the effects of atmospheric turbulence.
An ideal gas is allowed to expand slowly at constant temperature to twice its original volume. During the expansion, the gas absorbs 200 kJ of heat
(a) What is the change in the internal (thermal) energy of the gas during the expansion? (b) How much work does the gas do during the expansion? What will be an ideal response?
A 180-hp engine can deliver, in SI units, an average power of ____. (1 hp = 746 W)
a. 2.4E–1 W b. 4.1E+3 W c. 1.3E+5 W d. 1.8E+2 W e. 9.3E+2 W