Questions from College Physics

Q: Suppose you are facing due north at sunrise. Sunlight is reflected

Suppose you are facing due north at sunrise. Sunlight is reflected by a store's display window as shown. Is the reflected light partially polarized? If so, in what direction?

Q: A man is doing push-ups. He has a mass

A man is doing push-ups. He has a mass of 68 kg and his center of gravity is located at a horizontal distance of 0.70 m from his palms and 1.00 m from his feet. Find the forces exerted by the floor on...

Q: A submarine of mass 2.5 × 106 kg and initially

A submarine of mass 2.5 × 106 kg and initially at rest fires a torpedo of mass 250 kg. The torpedo has an initial speed of 100.0 m/s. What is the initial recoil speed of the submarine? Ignore the drag...

Q: (a) Explain why a transformer works for ac but not

(a) Explain why a transformer works for ac but not for dc. (b) Explain why a transformer designed to be connected to an emf of amplitude 170 V would be damaged if connected to a dc emf of 170 V.

Q: A block (mass m) hangs from a spring (spring

A block (mass m) hangs from a spring (spring constant k). The block is released from rest a distance d above its equilibrium position. (a) What is the speed of the block as it passes through the equi...

Q: A horizontal desk surface measures 1.3 m × 1.

A horizontal desk surface measures 1.3 m × 1.0 m. If Earth’s magnetic field has magnitude 0.044 mT and is directed 65° below the horizontal, what is the magnetic flux through the desk surface?

Q: An airplane is traveling from New York to Paris, a distance

An airplane is traveling from New York to Paris, a distance of 5.80 × 103 km. Ignore the curvature of Earth. (a) If the cruising speed of the airplane is 350.0 km/h, how much time will it take for th...

Q: Two atomic clocks are synchronized. One is put aboard a spaceship

Two atomic clocks are synchronized. One is put aboard a spaceship that leaves Earth at t = 0 at a speed of 0.750c. (a) When the spaceship has been traveling for 48.0 h (according to the atomic clock...

Q: Before a lightning strike can occur, the breakdown limit for damp

Before a lightning strike can occur, the breakdown limit for damp air must be reached. If this occurs for an electric field of 3.33 × 105 V/m, what is the maximum possible height above Earth for the b...

Q: Why is the muon sometimes called a “heavy electron”?

Why is the muon sometimes called a “heavy electron”?