The graph below shows a plot of angular acceleration in rad/s2 versus time from t = 0 s to t = 8 s. The change in angular velocity, ??, during this 8-second period is
A.
, CW.B.
, CCW.C.
, CW.D.
, CCW.E.
, CW.Answer: C
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Suppose that Mars were located at the same distance from the Sun as Earth, but was otherwise the same. Would it still be colder than Earth? Why or why not?
A) yes, because Mars has fewer clouds than Earth B) yes, because Mars has a much weaker greenhouse effect than Earth C) yes, because Mars has less gravity than the Earth D) no, because with the same distance from the Sun, the two planets would have the same temperature
Which one of the following is responsible for the "one-way" nature of time, i.e., for the distinction between past and future?
A) the law of inertia B) the law of conservation of energy C) the second law of thermodynamics D) the gravitational force E) the electromagnetic force
In the vacuum of outer space far from our Sun, there is no
A) gravity. B) atmospheric pressure. C) both of these D) none of the above
An unknown resistor is wired in series with an ammeter, and a voltmeter is placed in parallel across both the resistor and the ammeter. This network is then placed across a battery
If one computes the value of the resistance by dividing the voltmeter reading by the ammeter reading, the value obtained A) is less than the true resistance. B) is greater than the true resistance. C) is the true resistance. D) could be any of the given answers. It depends on other factors.