Questions from College Physics

Q: In a lab experiment, a string has a mass per unit

In a lab experiment, a string has a mass per unit length of 0.120 g/m. It is attached to a vibrating device and weight similar to that shown in Figure 11.23. The vibrator oscillates at a constant freq...

Q: A long straight wire carries a 4.70 A current in

A long straight wire carries a 4.70 A current in the positive x- direction. At a particular instant, an electron moving at 1.00 × 107 m/s in the positive y-direction is 0.120 m from the wire. Determin...

Q: Two conducting wires perpendicular to the page are shown in cross section

Two conducting wires perpendicular to the page are shown in cross section as gray dots in the figure. They each carry 10.0 A out of the page. What is the magnetic field at point P?

Q: At what rate is energy dissipated in the 4.00 Ω

At what rate is energy dissipated in the 4.00 Ω and 5.00 Ω resistors in the circuit shown?

Q: In Problem 86, the +2.0 µC charge is

In Problem 86, the +2.0 µC charge is at x = 0 and the −4.0 µC charge is at x = d. Find the x-coordinates of the point(s) where the electric field is zero.

Q: For a safe reentry into Earth's atmosphere, the pilots of a

For a safe reentry into Earth's atmosphere, the pilots of a space capsule must reduce their speed from 2.6 × 104 m/s to 1.1 × 104 m/s. The rocket engine produces a backward force on the capsule of 1.8...

Q: (a) If you were stranded on an island with a

(a) If you were stranded on an island with a pair of 3.5 D reading glasses, could you make a useful telescope? If so, what would be the length of the telescope and what would be the angular magnificat...

Q: In lab tests it was found that rats can detect electric fields

In lab tests it was found that rats can detect electric fields of about 5.0 kN/C or more. If a point charge of 1.0 µC is sitting in a maze, how close must the rat come to the charge in order to detect...

Q: Jason drives due west with a speed of 35.0 mi

Jason drives due west with a speed of 35.0 mi/h for 30.0 min, continues in the same direction with a speed of 60.0 mi/h for 2.00 h, and then drives farther west at 25.0 mi/h for 10.0 min. What is Jaso...

Q: A moving source emits a sound wave that is heard by a

A moving source emits a sound wave that is heard by a moving observer. Imagine a thin wall at rest between the source and observer. The wall completely absorbs the sound and instantaneously emits an i...