Questions from College Physics

Q: A pendulum consists of a bob of mass m attached to the

A pendulum consists of a bob of mass m attached to the end of a cord of length L. The pendulum is released from a point at a height of L/2 above the lowest point of the swing. What is the tension in t...

Q: A 0.67 mH inductor and a 130Ω. resistor are

A 0.67 mH inductor and a 130Ω. resistor are placed in series with a 24 V battery. (a) How long will it take for the current to reach 67% of its maximum value? (b) What is the maximum energy stored i...

Q: (a) Assume Earth is a uniform solid sphere. Find

(a) Assume Earth is a uniform solid sphere. Find the kinetic energy of Earth due to its rotation about its axis. (b) Suppose we could somehow extract 1.0% of Earth's rotational kinetic energy to use...

Q: The tension in a guitar string is increased by 15%. What

The tension in a guitar string is increased by 15%. What happens to the fundamental frequency of the string?

Q: The Bohr theory of the hydrogen atom ignores gravitational forces between the

The Bohr theory of the hydrogen atom ignores gravitational forces between the electron and the proton. Make a calculation to justify this omission. [Hint: Find the ratio of the gravitational and elect...

Q: In the diagram, regions A and C extend far to the

In the diagram, regions A and C extend far to the left and right, respectively. The electric field due to the two point charges is zero at some point in which region or regions? Explain.

Q: If the angle of incidence is greater than the angle of refraction

If the angle of incidence is greater than the angle of refraction for a light beam passing an interface, what can be said about the relative values of the indices of refraction and the speed of light...

Q: A 40 Hz sound wave is barely audible at a sound intensity

A 40 Hz sound wave is barely audible at a sound intensity level of 60 dB. What is the displacement amplitude of this sound wave? Compare it with the average distance between molecules in air at room t...

Q: Why is drinking water in a camp located near the equator often

Why is drinking water in a camp located near the equator often kept in porous jars?

Q: A certain pipe has resonant frequencies of 234 Hz, 390 Hz

A certain pipe has resonant frequencies of 234 Hz, 390 Hz, and 546 Hz, with no other resonant frequencies between these values. (a) Is this a pipe open at both ends or closed at one end? (b) What is...