Questions from College Physics

Q: It is easier to get a good draft in a chimney on

It is easier to get a good draft in a chimney on a windy day than when the outside air is still, all other things being equal. Why?

Q: In any hydraulic system, it is important to “bleed”

In any hydraulic system, it is important to “bleed” air out of the line. Why?

Q: For low-frequency sounds, the ear uses the phase difference

For low-frequency sounds, the ear uses the phase difference between the sound waves arriving at the two ears to determine direction. Why can't the ear reliably use phase difference for high- frequency...

Q: Jennifer lifts a 2.5 kg carton of cat litter from

Jennifer lifts a 2.5 kg carton of cat litter from the floor to a height of 0.75 m, starting and ending with the carton held at rest. (a) How much total work is done on the carton during this operatio...

Q: Julia is delivering newspapers. Suppose she is driving at 15 m

Julia is delivering newspapers. Suppose she is driving at 15 m/s along a straight road and wants to drop a paper out the window from a height of 1.00 m so it slides along the shoulder and comes to res...

Q: A car is speeding up and has an instantaneous velocity of 1

A car is speeding up and has an instantaneous velocity of 1.0 m/s in the +x-direction when a stopwatch reads 10.0 s. It has a constant acceleration of 2.0 m/s2 in the +x-direction. (a) What is the spe...

Q: A 1.0 m2 solar panel on a satellite that keeps

A 1.0 m2 solar panel on a satellite that keeps the panel oriented perpendicular to radiation arriving from the Sun absorbs 1.4 kJ of energy every second. The satellite is located at 1.00 AU from the S...

Q: Fernando detects the electric field from an isotropic source that is 22

Fernando detects the electric field from an isotropic source that is 22 km away by tuning in an electric field with an rms amplitude of 55 mV/m. What is the average power of the source?

Q: The radio telescope in Arecibo, Puerto Rico, has a diameter

The radio telescope in Arecibo, Puerto Rico, has a diameter of 305 m. It can detect radio waves from space with intensities as small as 10−26 W/m2. (a) What is the average power incident on the teles...

Q: A point charge q1 = +5.0 µC is fixed

A point charge q1 = +5.0 µC is fixed in place at x = 0, and a point charge q2 = −3.0 µC is fixed at x = −20.0 cm. Where can we place a point charge q3 = −8.0 µC so that the net electric force on q1 du...