Questions from College Physics

Q: Show that the coefficient of performance for a reversible heat pump is

Show that the coefficient of performance for a reversible heat pump is 1/(1 − TC/TH).

Q: The gauge pressure of the air in an automobile tire is 32

The gauge pressure of the air in an automobile tire is 32 lb/in2. Convert this to (a) Pa, (b) mmHg, (c) atm.

Q: A thin wire with positive charge Q evenly spread along its length

A thin wire with positive charge Q evenly spread along its length is shaped into a semicircle of radius R. (a). What is the direction of the electric field at the center of curvature of the semicircl...

Q: Show that the coefficient of performance for a reversible refrigerator is 1

Show that the coefficient of performance for a reversible refrigerator is 1/[(TH/TC) − 1].

Q: (a) Write an expression for the electric field at a

(a) Write an expression for the electric field at a point (0, y) on the dipole axis for y > d/2. What is the direction of the field? (b) Show that when y ≫ d, E ≈ 2kqd/y3. [Hint: Use the binomial appr...

Q: A pilot wants to fly from Dallas to Oklahoma City, a

A pilot wants to fly from Dallas to Oklahoma City, a distance of 330 km at an angle of 10.0° west of north. The pilot heads directly toward Oklahoma City with an airspeed of 200 km/h. After flying for...

Q: Rank these in order of increasing entropy: (a)

Rank these in order of increasing entropy: (a) 0.5 kg of ice and 0.5 kg of (liquid) water at 0°C; (b) 1 kg of ice at 0°C; (c) 1 kg of (liquid) water at 0°C; (d) 1 kg of water at 20°C.

Q: (a) Write an expression for the magnitude of the electric

(a) Write an expression for the magnitude of the electric field at a point (x, 0) on a line perpendicular to the dipole axis. State the direction of the field for x > 0 and for x < 0. (b) Show that w...

Q: The energy-time uncertainty principle allows for the creation of virtual

The energy-time uncertainty principle allows for the creation of virtual particles that appear from a vacuum for a very brief period of time Δt, then disappear again. This can happen as long as ΔE Δt...

Q: Rank these in order of increasing entropy: (a)

Rank these in order of increasing entropy: (a) 1 mol of water at 20°C and 1 mol of ethanol at 20°C in separate containers; (b) a mixture of 1 mol of water at 20°C and 1 mol of ethanol at 20°C; (c)...