The orbit of the binary pulsar, PSR 1936+16, studied by Taylor and Hulse
a. is so small that the orbital period is smaller than the pulsar period.
b. is growing smaller, presumably by emitting gravitational waves.
c. provides evidence that it is being orbited by at least 6 planets the size of Jupiter.
d. shows large changes each time an X-ray burst is emitted from the system.
e. contains a white dwarf and a black hole.
B
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Which of the following is NOT a quality of light?
a) Intensity b) Color c) Acceleration d) High Speed
The electric field at the surface of a conductor is
A) always zero. B) perpendicular to the surface. C) parallel to the surface. D) never zero.
A 3.0-kg brick rests on a perfectly smooth ramp inclined at 34° above the horizontal. The brick is kept from sliding down the plane by an ideal spring that is aligned with the surface and attached to a wall above the brick
The spring has a spring constant (force constant) of 120 N/m. By how much does the spring stretch with the brick attached? A) 36 cm B) 360 cm C) 24 cm D) 14 cm E) 240 cm
Transmitting power at high voltage, e.g., 400,000 V, reduces the power loss for transmission lines. But such a voltage would destroy electrical devices in household use. How then can such 400,000 V electricity be used in a normal house?
a. The ground prongs on household plugs reduce the voltage to 120 V. b. Before reaching households, transformers are used to reduce the voltage appropriately. c. No matter the incoming voltage, a 120-V device only lets 120 V in. d. The 400,000 V is just theoretical; long distance transmission lines actually use 120 V.