Questions from College Physics

Q: In a CRT (see Section 16.5), a constant

In a CRT (see Section 16.5), a constant electric field accelerates the electrons to high speed; then a magnetic field is used to deflect the electrons to the side. Why can't a constant magnetic field...

Q: A grandfather clock is running too fast. To fix it,

A grandfather clock is running too fast. To fix it, should the pendulum be lengthened or shortened? Explain.

Q: A vertical magnetic field is perpendicular to the horizontal plane of a

A vertical magnetic field is perpendicular to the horizontal plane of a wire loop. When the loop is rotated about a horizontal axis in the plane, the current induced in the loop reverses direction twi...

Q: Two circuits are constructed using identical, ideal batteries ( /

Two circuits are constructed using identical, ideal batteries ( ) and identical incandescent lightbulbs (resistance = R). If each bulb in circuit 1 dissipates 5.0 W of power, how much power does each...

Q: Two blocks of masses m1 and m2, resting on frictionless inclined

Two blocks of masses m1 and m2, resting on frictionless inclined planes, are connected by a massless rope passing over an ideal pulley. Angle φ = 45.0° and angle θ =...

Q: A current balance is a device to measure magnetic forces. It

A current balance is a device to measure magnetic forces. It is constructed from two parallel coils, each with an average radius of 12.5 cm. The lower coil rests on a balance; it has 20 turns and carr...

Q: Tarzan wants to swing on a vine across a river. He

Tarzan wants to swing on a vine across a river. He is standing on a ledge above the water’s edge, and the river is 5.00 m wide. The vine is attached to a tree branch that is 8.00 m d...

Q: (a) Find the equivalent resistance between points A and B

(a) Find the equivalent resistance between points A and B for the combination of resistors shown. (b) What is the potential difference across each of the 4.0 Ω resistors? (c) Wha...

Q: Two metal spheres are separated by a distance of 1.0

Two metal spheres are separated by a distance of 1.0 cm, and a power supply maintains a constant potential difference of 900 V between them. The spheres are brought closer to each other until a spark...

Q: A steel rod has length 60 cm and radius 2.2

A steel rod has length 60 cm and radius 2.2 cm. An aluminum rod has length 30 cm and radius 2.2 cm. The rods are joined end-to-end. When compressive forces of magnitude 5.4 kN are applied to the ends,...