An automobile's acceleration may be changed by using the
a. windshield wipers.
b. steering wheel.
c. radio.
d. horn.
b
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Consider the equipotential diagram shown below and to the left: 
In what direction does the electric field at point P point?
A. A B. B C. C D. D
The index of refraction, n, of a material is a measure of how the speed of light changes. What can be said about the speed of light in a material with n=1.5 compared to a material with n=1.7?
A. It is the same for both. B. It is slower in the n=1.7 material. C. It is slower in the n=1.5 material. D. It depends on the wavelength of the light.
If the first maximum of one circular diffraction pattern passes through the center of a second diffraction pattern, the two sources responsible for the pattern will appear to be a single source
Indicate whether the statement is true or false
A heat engine receives 7000 J of heat and loses 3000 J in each cycle. What is the efficiency of this engine?
A) 30% B) 43% C) 57% D) 70%