Questions from College Physics

Q: A standing wave is set up in a string of variable length

A standing wave is set up in a string of variable length and tension by a vibrator of variable frequency. Both ends of the string are fixed. When the vibrator has a frequency fA, in a string of length...

Q: A 12.0 - kg object hangs in equilibrium from a

A 12.0 - kg object hangs in equilibrium from a string with total length of L = 5.00 m and linear mass density of μ = 0.00100 kg/m. The string is wrapped around two light, frictionless pu...

Q: An electron is released from rest in a uniform electric field.

An electron is released from rest in a uniform electric field. Determine whether the following quantities increase, decrease, or remain unchanged as the electron moves. Indicate your answers with I (i...

Q: A “solar cooker” consists of a curved reflecting mirror that

A “solar cooker” consists of a curved reflecting mirror that focuses sunlight onto the object to be heated (Fig. P11.69). The solar power per unit area reaching the...

Q: A group of hikers hears an echo 3.00 s after

A group of hikers hears an echo 3.00 s after shouting. How far away is the mountain that reflected the sound wave?

Q: In the arrangement shown in Figure P14.50, an object

In the arrangement shown in Figure P14.50, an object of mass m = 5.0 kg hangs from a cord around a light pulley. The length of the cord between point P and the pulley is L = 2.0 m. (a) When the vibrat...

Q: A 60.00 - cm guitar string under a tension of

A 60.00 - cm guitar string under a tension of 50.000 N has a mass per unit length of 0.10000 g/cm. What is the highest resonant frequency that can be heard by a person capable of hearing frequencies u...

Q: Standing - wave vibrations are set up in a crystal goblet with

Standing - wave vibrations are set up in a crystal goblet with four nodes and four antinodes equally spaced around the 20.0 - cm circumference of its rim. If transverse waves move around the glass at...

Q: A car’s 30.0 - kg front tire is suspended by

A car’s 30.0 - kg front tire is suspended by a spring with spring constant k = 1.00 × 105 N/m. At what speed is the car moving if washboard bumps on the road every 0.750 m drive the tire into a resona...

Q: A pipe has a length of 0.750 m and is

A pipe has a length of 0.750 m and is open at both ends. (a) Calculate the two lowest harmonics of the pipe. (b) Calculate the two lowest harmonics after one end of the pipe is closed.