What is electric current?
a. The same thing as a charge.
b. The electrical energy from a generator.
c. The electrical energy from by a battery.
d. An abrupt and brief electrical discharge, such as a spark.
e. A continuous flow of charge.
e
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The graph below shows a plot of angular acceleration in rad/s2 versus time from t = 0 s to t = 8 s. The angular velocity at t = 0 s is 
, CCW. The angular velocity, ?, at t = 8 s is
A.
, CW.B.
, CCW.C.
, CW.D.
, CCW.E.
, CW.Wave Characteristics: Which one of the following types of electromagnetic wave travels through space the fastest?
A. radio waves B. infrared C. ultraviolet D. microwaves E. They all travel through space at the same speed.
A 1000-kg helicopter hovers over a forest fire and starts to squirt water downward with a speed of 10 m/s at a rate of 40 kg/s. What is the initial upward acceleration on the helicopter when it first starts to release the water?
A) 2.5 m/s2 B) 0.40 m/s2 C) 0.25 m/s2 D) 4.0 m/s2 E) 5.0 m/s2
The bright object in this photo is a quasar (named 3C 273). According to current understanding, about how big is the source of the bright light?
A) about the size of our solar system B) about a million light-years across C) about the size of the central bulge of the Milky Way Galaxy (that is, about 10,000 light-years across) D) about 500 light-years across