Motional Emf: As shown in the figure, a metal bar is in contact with a pair of parallel rails and is in motion with an upward velocity of magnitude ?. A uniform magnetic field is present, directed downward as shown. The direction of the induced current through the resistor R is
A. from a to b.
B. from b to a.
C. No current is induced.
Answer: C
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Thin Lenses: Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.)
A. The image is always real. B. The image is always virtual. C. The image is always inverted. D. The image is always upright. E. None of these choices are correct.
In what way is the rocky material of Jupiter's core different from the rocks found on Earth?
a. It is much cooler because Jupiter is further from the Sun. b. It contains more liquid water. c. It is much hotter and denser because of the extreme pressure at the core of Jupiter. d. It is not composed of iron and nickel because this material will float of the surface. e. It is composed entirely of ices that have frozen into a large rock-like structure.
Doppler Effect: Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 536 Hz. A microphone is moved between the speakers along the line joining the two speakers with a constant speed of 1.60 m/s. What beat frequency is observed? The speed of sound in air is 343 m/s.
A. 5.00 Hz B. 6.00 Hz C. 7.00 Hz D. 8.00 Hz E. 9.00 Hz
Io's volcanoes contribute material to a ________ around the planet Jupiter's equator
Fill in the blank(s) with correct word