A 20-g bullet moving at 1000 m/s is fired through a one-kg block of wood emerging at a speed of 200 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?
a. 0 J
c. 9.5 kJ
b. -9.5 kJ
d. -18 J
B
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A boat sounds a fog horn on a day when both the sea water and the air temperature are 25.0° C. The speed of sound in sea water is 1 533 m/s. How much earlier (in s) does a dolphin 1 000 m from the source hear the sound than a person in a boat that is also 1 000 m distant? (Ignore the time it takes the sound to reach the water surface.)
a. 0.652 b. 2.12 c. 2.24 d. 2.77 e. 2.90
Which of the following factors was very important to the decision to classify Pluto as a dwarf planet rather than a "regular" planet?
A) its small size and mass B) its large distance from the Sun C) its composition of ice and rock D) its relatively large moon, Charon
The greenhouse effect occurs because
a. low frequency EM waves are reflected from the atmosphere. b. high frequency EM waves are reflected from the atmosphere. c. the ozone layer absorbs ultraviolet light. d. carbon dioxide in the atmosphere absorbs infrared radiation. e. none of the above
A pendulum bob on the end of a 1 m long piece of string is pulled 2 cm from its equilibrium position and it is released. In one full cycle of its motion, through what total distance does it travel?
1.2 cm 2.1/2 cm 3.4 cm 4.8 cm