Questions from College Physics

Q: Water droplets in air create rainbows. Describe the physical situation that

Water droplets in air create rainbows. Describe the physical situation that causes a rainbow. Should you look toward or away from the Sun to see a rainbow? Why is the secondary rainbow fainter than th...

Q: The particle in a box model is often used to make rough

The particle in a box model is often used to make rough estimates of energy level spacings. For a metal wire 10 cm long, treat a conduction electron as a particle confined to a one-dimensional box of...

Q: A clay roof tile of mass 2.7 kg slides down

A clay roof tile of mass 2.7 kg slides down a roof inclined at 48° with respect to the horizontal. If the tile starts from rest 3.2 m from the edge of the roof and friction is negligible, how fast is...

Q: (a) Use dimensional analysis to show that the electric power

(a) Use dimensional analysis to show that the electric power output of a wind turbine is proportional to the cube of the wind speed. The relevant quantities on which the power can depend are the lengt...

Q: Show that U = −2K for any gravitational circular orbit.

Show that U = −2K for any gravitational circular orbit. [Hint: Use Newton’s second law to relate the gravitational force to the acceleration required to maintain uniform circular motion.]

Q: A spaceship is traveling away from Earth at 0.70c.

A spaceship is traveling away from Earth at 0.70c. The astronauts report home by radio every 4.0 h (by their own clocks). (a) At what interval are the reports sent to Earth, according to Earth clocks...

Q: Natural gas is sold by volume. In the United States,

Natural gas is sold by volume. In the United States, the price charged is usually per cubic foot. Given the price per cubic foot, what other information would you need in order to calculate the price...

Q: A grating with 5550 slits/cm has red light of 0

A grating with 5550 slits/cm has red light of 0.680 µm incident on it. The light shines through the grating onto a screen that is 5.50 m away. (a) What is the distance between adjacent slits on the g...

Q: The orbit of comet Halley around the Sun is a long thin

The orbit of comet Halley around the Sun is a long thin ellipse. At its aphelion (point farthest from the Sun), the comet is 5.3 × 1012 m from the Sun and moves with a speed of 10.0 km/s. What is the...

Q: An FM radio station broadcasts at a frequency of 89.3

An FM radio station broadcasts at a frequency of 89.3 MHz. The power radiated from the antenna is 50.0 kW. (a) What is the energy in electron-volts of each photon radiated by the antenna? (b) How ma...