The energy conversion represented by an automobile speeding up along a level road is
A) chemical to kinetic.
B) chemical to gravitational.
C) thermal to chemical.
D) gravitational to kinetic.
E) kinetic to chemical.
A
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The average value of 
t for a complete cycle is
A. 1. B. 0. C. 0.707. D. 0.500. E. 0.250.
The unit of capacitance, the farad, is dimensionally equivalent to which of the following?
a. J/V c. V×C b. C/V d. V/C
Why is Mars' greenhouse effect negligible compared to that of Earth's?
A) Its mass is only one-ninth of Earth's. B) Greenhouse gas emissions were greatly curtailed according to the International Mars Greenhouse Gas Reduction Treaty of 2003. C) The Martian atmosphere is much thinner and retains little heat. D) Martian carbon dioxide contains a rare isotope with little ability to trap heat.
What is the particle X in the reaction 
a. 
b. 
C. e-
D. 