What did Robert Brown see in his microscope?
A) straight-line motion
B) circular motions
C) parabolic motions
D) random motions
Answer: D
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An airplane flies 120 km at a constant altitude in a direction 30.0° north of east. A wind is blowing that results in a net horizontal force on the plane due to the air of 2.40 kN in a direction 10.0° south of west
How much work is done on the plane by the air? A) -2.71 × 108 J B) -0.985 × 108 J C) -221 × 108 J D) 221 × 108 J E) 0.821 × 108 J
A plane is moving due north, directly towards its destination. Its airspeed is 210 mph. A constant breeze is blowing from west to east at 25.0 mph. In which direction is the plane pointed?
a. 6.79° W of N b. 83.2° W of N c. 44.8° W of N d. 83.2° E of N e. 45.2° E of N
The potential energy of a pendulum is greatest
a. when its potential energy is least. b. at the top of its swing. c. at the bottom of its swing. d. when its total energy is greatest.
When a p-n junction diode is forward biased
A) a current does not flow through it. B) a current flows through it from the p-side to the n-side. C) a current flows through it from the n-side to the p-side. D) a current flows because holes and electrons are traveling in opposite directions away from the junction. E) a current flows because holes and electrons are traveling in the same direction towards the junction.