Equal charges are located at the vertices of a 3-4-5 triangle. The charge experiencing the largest force is located at
A)
the 90° vertex.
B)
the 37° vertex.
C)
a vertex that depends on the size of the charges.
D)
the 53° vertex.
E)
cannot be determined.
D
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The white dwarf that remains when our Sun dies will be mostly made of
A) hydrogen. B) helium. C) carbon. D) neutrons.
When we speak of time dilation, we mean that time
A) compresses with speed. B) stretches with speed. C) is constant at all speeds.
The graph shows 
versus t for an object moving along straight line. What is the acceleration at t = 11 s?
A. -10 
B. 10
C. 22
D. -22
Because of absorption, a Polaroid will actually transmit about 40% of incident nonpolarized light. Two Polaroids with their axes aligned will transmit
A) 0%. B) 40%. C) 100%. D) between 0% and 40%. E) between 40% and 100%.