A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with a speed V?
a. QVB toward the east
b. Zero
c. QVB toward the west
d. QVB upward
e. QVB toward the south
C
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Unpolarized light passes through a combination of two ideal polarizers. The transmission axes of the first polarizer and the second polarizer are at 30.0° to each other. What percentage of the original light gets through the combination?
A) 37.5% B) 50% C) 75% D) 100%
Sound in a vacuum is impossible
Indicate whether the statement is true or false
An important feature of red sunsets is the
A) scattering of lower frequencies by larger particles in the air. B) longer path of air through which sunlight travels. C) lower frequencies of light emitted late in the day by the Sun. D) absorption effects of the smaller particles in the air.
Suppose a particle is moving along a straight line with a speed v for a time t, then stops for a time t, and then resumes moving along the original direction with speed v for time t. What has been the average speed of the particle for the total time period 3t?