A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away from a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s
A) 378 Hz
B) 389 Hz
C) 411 Hz
D) 422 Hz
E) 450 Hz
A
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Blackbody radiation is from a body that
A) does not emit radiation in the visible. B) is black. C) deflects all radiation falling on it. D) absorbs all radiation falling on it. E) is actually white.
An object of mass 10.0 kg is initially at rest. A 100 N force causes it to move horizontally through a distance of 6.00 m. What is the change in the kinetic energy of this object?
A) 0 J B) 200 J C) 60.0 J D) 600 J E) 1000 J
A satellite is moved from a low orbit to one that is twice as far from Earth. Its mass at its new orbit is ________.
A. increased by a factor of 2 B. decreased by a factor of 2 C. unchanged D. decreased by a factor of 4 E. There is no gravity in space.
A 1 000-V battery, a 3 000-? resistor, and a 0.50-?F capacitor are connected in series with a switch. The time constant for such a circuit, designated by the Greek letter, ?, is defined as the time that the capacitor takes to charge to 63% of its capacity after the switch is closed. What is the current in the circuit at a time interval of ? seconds after the
switch has been closed?
a.
0.14 A
b.
0.21 A
c.
0.12 A
d.
0.32 A