In a model airplane, the propeller is a significant part of the total mass. A model airplane is flying on a level path, with its propeller rotating clockwise as seen facing the airplane
At a preset time, a signal causes the plane to lower its tail flaps and it goes into a nose-down attitude. When this happens, the nose of the plane also swings towards the right. Explain why this happens.
As the plane goes into a nose-down position, the angular velocity, of the propeller, which is directed from nose to tail along the body, undergoes a change in the upward direction. This requires an external torque in the vertical direction, so a downward torque is exerted on the plane by the propeller, and the plane swings to the right.
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A lunar eclipse that occurs when the moon moves completely into Earth's umbral shadow is called
a. a total solar eclipse. b. a partial solar eclipse. c. an annular solar eclipse. d. a penumbral lunar eclipse. e. an umbral lunar eclipse.
A rough surface for infrared waves may be polished for
A) radio waves. B) light waves. C) both of these D) neither
The circuit below contains three 100-W light bulbs. The emf ? = 110 V. Which light bulb(s) is(are) brightest?
a.
A
b.
B
c.
C
d.
B and C
e.
All three are equally bright.
The combination of two separated point charges of opposite sign but equal magnitude is called an electric:
a. magnapole. c. quadrapole. b. dipole. d. monopole.