Which of the following is not an electromagnetic wave?
A. Light
B. Microwaves
C. Infrared
D. Sound
E. X-ray
Answer: D
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A beam of electrons is sent in the positive x-direction in a region with a uniform magnetic field B in the positive y-direction and a uniform electric field E in the positive z-direction. At which of the following speeds would the electrons be deflected in the positive z-direction?
a. v < E/B b. v = E/B c. v > E/B d. There is no speed for which this will happen.
Suppose you climb the stairs of an eight-story building, about 24 m high, and your mass is 70 kg. The gravitational potential energy you gain is about
A. 40 calories. B. 16,500 calories. C. 40 Joule. D. 16,500 Joule.
An instrument is rated at 250 W if it is connected across a 120-V dc power supply
(a) What current does it draw under normal operation? (b) What is its resistance? (c) How many kilowatt-hours does it use in a day if it is left on all the time?
Two uniform solid spheres have the same mass, but one has twice the radius of the other. The ratio of the larger sphere's moment of inertia to that of the smaller sphere is
A) 4/5. B) 8/5. C) 1/2. D) 2. E) 4.