Questions from Modern Physics

Q: A light wire is tightly stretched with tension F. Transverse traveling

A light wire is tightly stretched with tension F. Transverse traveling waves of amplitude A and wavelength l1 carry average power Pav,1 = 0.400 W. If the wavelength of the waves is doubled, so

Q: A jet plane at takeoff can produce sound of intensity 10.

A jet plane at takeoff can produce sound of intensity 10.0 W/m2 at 30.0 m away. But you prefer the tranquil sound of normal conversation, which is 1.0

Q: You are investigating the report of a UFO landing in an isolated

You are investigating the report of a UFO landing in an isolated portion of New Mexico, and you encounter a strange object that is radiating sound waves uniformly in all directions. Assume that the so...

Q: For a simple pendulum, clearly distinguish between v (the angular

For a simple pendulum, clearly distinguish between v (the angular speed) and v (the angular frequency). Which is constant and which is variable?

Q: By measurement you determine that sound waves are spreading out equally in

By measurement you determine that sound waves are spreading out equally in all directions from a point source and that the intensity is 0.026 W/m2 at a distance of 4.3 m from the source. (a) What is t...

Q: A fellow student with a mathematical bent tells you that the wave

A fellow student with a mathematical bent tells you that the wave function of a traveling wave on a thin rope is y(x, t) = 2.30 mm cos[(6.98 rad/m)x +(742 rad/s)t]. Being more practical, you measure t...

Q: At a distance of 7.00 × 1012 m from a

At a distance of 7.00 × 1012 m from a star, the intensity of the radiation from the star is 15.4 W/m2. Assuming that the star radiates uniformly in all directions, what is the total power output of th...

Q: A thin, taut string tied at both ends and oscillating in

A thin, taut string tied at both ends and oscillating in its third harmonic has its shape described by the equation y(x, t) = (5.60 cm) sin [(0.0340 rad / cm)x] sin [(50.0 rad / s)t], where the origin...

Q: The wave function of a standing wave is y(x,

The wave function of a standing wave is y(x, t) = 4.44 mm sin[(32.5 rad/m)x] sin[(754 rad/s)t]. For the two traveling waves that make up this standing wave, find the (a) amplitude; (b) wavelength; (c)...

Q: A flexible stick 2.0 m long is not fixed in

A flexible stick 2.0 m long is not fixed in any way and is free to vibrate. Make clear drawings of this stick vibrating in its first three harmonics, and then use your drawings to find the wavelengths...