Questions from College Physics

Q: Show that Eq. (26-23) reduces to the

Show that Eq. (26-23) reduces to the nonrelativistic relationship between momentum and kinetic energy, K ≈ p2/(2m), for K ≪ E0.

Q: In Fig. 3.39, two blocks are connected by

In Fig. 3.39, two blocks are connected by a lightweight cord that does not stretch and that passes over an ideal pulley. (a) If m1 = 3.0 kg and m2 = 5.0 kg, what are the accelerations of each block?...

Q: Five conducting spheres are charged as shown. All have the same

Five conducting spheres are charged as shown. All have the same magnitude net charge except E, whose net charge is zero. Which pairs are attracted to each other and which are repelled by each other wh...

Q: To get to a concert in time, a harpsichordist has to

To get to a concert in time, a harpsichordist has to drive 122 mi in 2.00 h. (a) If he drove at an average speed of 55.0 mi/h in a due west direction for the first 1.20 h, what must be his average sp...

Q: In the circuit, the capacitor is initially uncharged. At t

In the circuit, the capacitor is initially uncharged. At t = 0, switch S is closed. Find the currents I1 and I2 and voltages V1 and V2 (assuming V3 = 0) at points 1 and 2 at (a) t = 0 (i.e., just aft...

Q: A 1.5 hp motor operates on 120 V. Ignoring

A 1.5 hp motor operates on 120 V. Ignoring I2R losses, how much current does it draw?

Q: Explain why the displacement of air elements at condensations and rarefactions is

Explain why the displacement of air elements at condensations and rarefactions is zero.

Q: (a) Light of wavelength 300 nm is incident on a

(a) Light of wavelength 300 nm is incident on a metal that has a work function of 1.4 eV. What is the maximum speed of the emitted electrons? (b) If light of wavelength 800 nm is incident on a metal...

Q: In the circuit, the initial energy stored in the capacitor is

In the circuit, the initial energy stored in the capacitor is 25 J. At t = 0 the switch is closed. (a) Sketch a graph of the voltage across the resistor (VR) as a function of t. Label the vertical ax...

Q: An automobile traveling at a speed of 30.0 m/

An automobile traveling at a speed of 30.0 m/s applies its brakes and comes to a stop in 5.0 s. If the automobile has a mass of 1.0 × 103 kg, what is the average horizontal force exerted on it during...