Questions from College Physics

Q: Show that over one complete cycle, the average value of a

Show that over one complete cycle, the average value of a sin2 ωt is . / Use the trigonometric identity sin2 ωt = (1 − cos 2ωt)/2.

Q: Think of an example that illustrates why an “anti-Lenz

Think of an example that illustrates why an “anti-Lenz” law would violate the conservation of energy. (The “anti-Lenz” law is: The direction of induced emfs and currents always reinforces the change t...

Q: At a baseball game, a radar gun measures the speed of

At a baseball game, a radar gun measures the speed of a 144 g baseball to be 137.32 ± 0.10 km/h. (a) What is the minimum uncertainty of the position of the baseball? (b) If the speed of a proton is m...

Q: Think of a crystalline solid as a set of atoms connected by

Think of a crystalline solid as a set of atoms connected by ideal springs. When a wire is stretched, how is the elongation of the wire related to the elongation of each of the interatomic springs? Use...

Q: A 2 m long copper pipe is held vertically. When a

A 2 m long copper pipe is held vertically. When a marble is dropped down the pipe, it falls through in about 0.7 s. A magnet of similar size and shape dropped down the pipe takes much longer. Why?

Q: The lowest frequency string on a guitar is 65.5 cm

The lowest frequency string on a guitar is 65.5 cm long and is tuned to 82 Hz. (a) If the string has a mass of 3.31 g, what is the tension in the string? (b) By fingering the guitar at the fifth fre...

Q: As a Boeing 747 gains altitude, the passenger cabin is pressurized

As a Boeing 747 gains altitude, the passenger cabin is pressurized. However, the cabin is not pressurized fully to atmospheric (1.01 × 105 Pa), as it would be at sea level, but rather pressurized to 7...

Q: A wheel of radius 30 cm is rotating at a rate of

A wheel of radius 30 cm is rotating at a rate of 2.0 revolutions every 0.080 s. (a) Through what angle, in radians, does the wheel rotate in 1.0 s? (b) What is the linear speed of a point on the whe...

Q: What are the advantages of using the concepts of stress and strain

What are the advantages of using the concepts of stress and strain to describe deformations?

Q: Find the work done by gravity on the hanging crate.

Find the work done by gravity on the hanging crate.