Which of the following is NOT true about vector images?
A. They are saved in a web-ready format.
B. They are resolution-independent.
C. You can create vector images using illustration software.
D. They are created by combining shapes, curves, and lines.
Answer: A
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Suppose the two plates of a parallel-plate capacitor have fixed charges Q and -Q. If we double the gap between the plates, the (a) potential difference between the plates,
A. quadruples. B. doubles. C. remains the same. D. is reduced by a factor of two. E. is reduced by a factor of four. F. some other result (specify).
The acceleration due to gravity is smaller on Mars than the Earth, so the Mars rovers that explore the surface are lighter on Mars than they are on Earth. If the rovers roll across a flat plain, then the force required to accelerate the rovers is
A. more than would be required on Earth. B. less than would be required on Earth. C. the same as would be required on Earth.
What is the mean free path of molecules in an ideal gas in which the mean collision time is 3.00 × 10-10 s, the temperature is 300 K,
and the mass of the molecules is 6.00 × 10-25 kg? Assume that the molecules are moving at their root-mean-square speeds. The Boltzmann constant is 1.38 × 10-23 J/K. A) 7.22 × 10-8 m B) 4.32 × 10-8 m C) 9.19 × 10-8 m D) 1.39 × 10-8 m E) 6.71 × 10-8 m
The masses of stars are found by measurements of
A) light intensity. B) temperature. C) Doppler shifting. D) binaries. E) relative sizes.