When the Universe was young, it was
A. smaller and less dense.
B. bigger and colder.
C. bigger and hotter.
D. bigger and more dense.
E. smaller and hotter.
Answer: E
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Energy Conservation With Conservative Forces: A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case.
In which case will the speed of the stone be greatest when it hits the water below if there is no significant air resistance?
A. Case A B. Case B C. Case C D. Case D E. The speed will be the same in all cases.
The lid of a grand piano is propped open as shown. Which arrow most closely approximates the direction of the force that the hinge exerts on the lid? Assume that the prop exerts a force in parallel to the prop’s length. (Hint: Draw a torque diagram of the lid.)
A. A
B. B
C. C
D. D
E. E
F. F
T. T
A pilot drops a bomb from a plane flying horizontally at a constant speed. When the bomb hits the ground, the horizontal location of the plane will
A) be in front of the bomb. B) be over the bomb. C) be behind the bomb.
Household circuits are wired in parallel. Adding more appliances to a parallel circuit
A. increases the voltage sent to each appliance. B. decreases the current sent to each appliance C. increases the current drawn from the circuit but does not change the current to each appliance.