A ball is thrown at a 30.0° angle above the horizontal across level ground. It is released from a height of 2.00 m above the ground with a speed of 18.0 m/s. How far does the ball travel horizontally before it strikes the ground?
A)
28.6 m
B)
24.0 m
C)
26.5 m
D)
10.5 m
E)
31.7 m
E
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This diagram shows a person on a planet watching you travel to the right at 0.9c, while you have a flashlight turned on with the light shining to the right. Which of the following statements is not true from your point of view?
A) If you can increase your speed by another 0.1c, you'll be able to keep up with the flashlight beam. B) The person and planet are moving to your left at 0.9c. C) Time is running slow for the person on the planet. D) The light from the flashlight beam is moving to the right at the speed of light c.
The frequency of a certain wave is 10 hertz and its period is
A) 0.1 second. B) 10 seconds. C) 100 seconds. D) none of the above
The proper order of the layers of a generic atmosphere from lowest altitude to highest is
A) troposphere, stratosphere, exosphere, thermosphere. B) troposphere, stratosphere, thermosphere, exosphere. C) stratosphere, troposphere, exosphere, thermosphere. D) stratosphere, troposphere, thermosphere, exosphere. E) none of the above
Determine the magnitude and sense (direction) of the current in the 10-? resistor when I = 1.8 A
a.
1.6 A right to left
b.
1.6 A left to right
c.
1.2 A right to left
d.
1.2 A left to right
e.
1.8 A left to right