Questions from College Physics

Q: A sound wave in room-temperature air has an intensity level

A sound wave in room-temperature air has an intensity level of 65.0 dB and a frequency of 131 Hz. (a) What is the pressure amplitude? (b) What is the displacement amplitude?

Q: A straight, stiff wire of length 1.00 m and

A straight, stiff wire of length 1.00 m and mass 25 g is suspended in a magnetic field B = 0.75 T. The wire is connected to an emf. How much current must flow in the wire and in what direction so that...

Q: The sound level 25 m from a loudspeaker is 71 dB.

The sound level 25 m from a loudspeaker is 71 dB. What is the rate at which sound energy is produced by the loudspeaker, assuming it to be an isotropic source?

Q: Explain how it is possible that more than half of the molecules

Explain how it is possible that more than half of the molecules in an ideal gas have kinetic energies less than the average kinetic energy. Shouldn't half have less and half have more?

Q: Can an astronaut on the Moon use a straw to drink from

Can an astronaut on the Moon use a straw to drink from a normal drinking glass? How about if he pokes a straw through an otherwise sealed juice box? Explain.

Q: A high-speed dental drill is rotating at 3.14

A high-speed dental drill is rotating at 3.14 × 104 rad/s. Through how many degrees does the drill rotate in 1.00 s?

Q: A battery has a terminal voltage of 12.0 V when

A battery has a terminal voltage of 12.0 V when no current flows. Its internal resistance is 2.0 Ω. If a 1.0 Ω resistor is connected across the battery terminals, what is the terminal voltage and what...

Q: Both a microscope and a telescope can be constructed from two converging

Both a microscope and a telescope can be constructed from two converging lenses. What are the differences? Why can't a telescope be used as a microscope? Why can't a microscope be used as a telescope?...

Q: A horizontal spring with spring constant of 9.82 N/

A horizontal spring with spring constant of 9.82 N/m is attached to a block with a mass of 1.24 kg that sits on a frictionless surface. When the block is 0.345 m from its equilibrium position, it has...

Q: A road with a radius of 75.0 m is banked

A road with a radius of 75.0 m is banked so that a car can navigate the curve at a speed of 15.0 m/s without any friction. On a cold day when the street is icy, the coefficient of static friction betw...