Imagine a small magnet (with its north pole vertically upward) passing near the north pole of an external magnet that is below the small magnet. In what direction does the net force acting on the magnet point?
A. Upward.
B. Downward.
C. There is zero net force.
D. None of the above (explain).
B. Downward.
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A metal blade (length = 80 cm) spins at a constant rate of 10 radians/s about a pivot at one end. A uniform magnetic field of 2.0 mT is directed at an angle of 30° with the plane of the rotation. What is the magnitude of the potential difference between the two ends of the blade?
A. 5.5 mV B. 6.4 mV C. 3.2 mV D. 11 mV E. 13 mV
You are on a boat in a fog and know there are cliffs ahead of you somewhere, but you cannot see them. You use your fog horn to send out a blast of sound (assume the temperature of the air is 20 oC) and the time it takes for the sound to return to you is 20.0 s. How far away are the cliffs (in metric units)? Hint: Be careful and think about the physics of the problem. You may want to make a sketch
of the situation to help you determine the answer. a. 1798 m b. 3444 m c. 3596 m d. 7192 m
A 34-kg child on an 18-kg swing set swings back and forth through small angles
If the length of the very light supporting cables for the swing is how long does it take for each complete back-and-forth swing? Assume that the child and swing set are very small compared to the length of the cables. A) 4.4 s B) 4.8 s C) 5.3 s D) 5.7 s
In the atmosphere, the intensity of scattered sunlight of longer wavelength is greater than that of shorter wavelength
Indicate whether the statement is true or false