Physics/ answers to questions - 1. Which one of the following statements best explains why it is possible to define an electrostatic potential in a region of space that contains an electrostatic field?
a. Work must be done to bring two positive charges closer together
b. Like charges repel one another and unlike charges attract one another
c. A positive charge will gain kinetic energy as it a...
Physics/ Check answers to questions - (See attached file for full problem description)
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1. The current in a certain ac circuit is independent of the frequency at a given voltage. Which combination of elements is most likely to comprise the circuit?
a. Resistors only
b. Inductors only
c. Capacitors only
d. A combination of inductors and resistors
e. A combination of inductors and capa...
Modern Physics Questions - 1. A certain string on a piano is tuned to produce middle C
(f = 261.63 Hz) by carefully adjusting the tension is the string. For a
fixed wavelength, what is the frequency when this tension is
doubled?
a. 130.08 Hz
b. 185.00 Hz
c. 370.00 Hz
d. 446.63 Hz
e. 523.26 Hz
2. A bell is ringing inside of a sealed glass jar that is connected to a
vacuum pump. Initiall...
Modern Physics Multiple Choice - 1. During a typical workday (eight hours), the average sound intensity arriving at Larry’s ear is 1.8 x 10–5 W/m2. If the area of Larry’s ear through which the sound passes is 2.1 x 10–3 m2, what is the total energy entering each of Larry’s ears during the workday?
a. 1.8 x 10–3 J
b. 2.2 x 10–4 J
c. 7.4 x 10–4 J
d. 1.1 x 10–3 J
e. 4.1 x 10–3 J
2. According...
Physics/ Check answers to questions - (See attached file for full problem description)
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1. At time t = 2.3 s, a 4-kg block that initially moves with a constant speed of 6 m/s undergoes an inelastic collision with another block. Any two inertial observers must agree that
a. The event took place at t = 2.3 s.
b. The initial speed of the block is 6 m/s.
c. The initial momentum of the blo...