Questions from College Physics

Q: A point source of light is in front of a plane mirror

A point source of light is in front of a plane mirror. (a) Show that all the reflected rays, when extended back behind the mirror, intersect in a single point. [Hint: See Fig. 23.27a and use similar...

Q: Yosemite Falls in California is about 740 m high, (

Yosemite Falls in California is about 740 m high, (a) What average power would it take for a 70 kg person to hike up to the top of Yosemite Falls in 1.5 h? (b) The human body is about 25% efficient...

Q: The surface of the water in a swimming pool is completely still

The surface of the water in a swimming pool is completely still. Describe what you would see looking straight up toward the surface from under water. [Hint: Sketch some rays. Consider both reflected a...

Q: A charged particle is observed to have a total energy of 0

A charged particle is observed to have a total energy of 0.638 MeV when it is moving at 0.600c. If this particle enters a linear accelerator and its speed is increased to 0.980c, what is the new value...

Q: A manufacturer is designing a shaving mirror, which is intended to

A manufacturer is designing a shaving mirror, which is intended to be held close to the face. If the manufacturer wants the image formed to be upright and as large as possible, what characteristics sh...

Q: A hang glider moving at speed 9.5 m/s

A hang glider moving at speed 9.5 m/s dives to an altitude 8.2 m lower. Ignoring drag, how fast is it then moving?

Q: A car moving at 30 mi/h is stopped by jamming

A car moving at 30 mi/h is stopped by jamming on the brakes and locking the wheels. The car skids 50 ft before coming to rest. How far would the car skid if it were initially moving at 60 mi/h? [Hint:...

Q: One way to loosen the lid on a glass jar is to

One way to loosen the lid on a glass jar is to run it under hot water. How does that work?

Q: A sigma baryon at rest decays into a lambda baryon and a

A sigma baryon at rest decays into a lambda baryon and a photon: Σ0 → Λ0 + γ. The rest energies of Σ0 and Λ0 are 1192 MeV and 1116 MeV, respectively. What is the photon wavelength?

Q: In a cathode ray tube, electrons are accelerated from rest by

In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.4 × 10−17 N during the first 2.0 cm of the tube's length; then they move at essentially constant...