Compared to the summer, the atmospheric pressure above a Martian polar cap in winter is
A) lower
B) about the same
C) slightly higher
D) much higher
A
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Beats: A music tuner uses a 554-Hz C# tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the instrument?
A. It must be 556 Hz. B. It must be 552 Hz. C. It could be either 556 Hz or 552 Hz. D. It could be either 553 Hz or 555 Hz. E. It is neither 556 Hz or 552 Hz.
According to fossil evidence, how far back in time did life on Earth exist?
A) about 545 million years B) about 2.0 billion years C) about 65 million years D) about 3.5 billion years or more
The standard model of particle physics predicts the existence of three families of elementary particles with four particles in each family. All of these particles have been confirmed experimentally except for the tau neutrino. Most physicists think the reason it has not been found is that
A. it likely does not exist. B. it is associated with the tau particle and the tau is difficult to trap. C. no current particle accelerator can generate enough energy to create a tau neutrino. D. neutrinos are very difficult to detect.
A 200-? resistor is rated at 1/4 W. What is the maximum voltage that can safely be connected across it?
A) 0.71 V B) 7.1 V C) 50 V D) 0.25 V