Questions from College Physics

Q: An automobile has a vertical radio antenna 1.20 m long

An automobile has a vertical radio antenna 1.20 m long. The automobile travels at 65.0 km/h on a horizontal road where Earth’s magnetic field is 50.0 μT, directed toward the north and downward at an a...

Q: An astronaut is connected to her spacecraft by a 25-m

An astronaut is connected to her spacecraft by a 25-m-long tether cord as she and the spacecraft orbit Earth in a circular path at a speed of 3.0 x 103 m/s. At one instant, the voltage measured betwee...

Q: Figure P20.29 shows a bar of mass m = 0

Figure P20.29 shows a bar of mass m = 0.200 kg that can slide without friction on a pair of rails separated by a distance â„“ = 1.20 m and located on an inclined plane that makes an an...

Q: (a) Does the phase angle in an RLC series circuit

(a) Does the phase angle in an RLC series circuit depend on frequency? (b) What is the phase angle for the circuit when the inductive reactance equals the capacitive reactance?

Q: Consider the arrangement shown in Figure P20.30 where R =

Consider the arrangement shown in Figure P20.30 where R = 6.00 Ω, ℓ = 1.20 m, and B = 2.50 T. (a) At what constant speed should the bar be moved to produce a current of 1...

Q: A square coil of wire of side 2.80 cm is

A square coil of wire of side 2.80 cm is placed in a uniform magnetic field of magnitude 1.25 T directed into the page as in Figure P20.31. The coil has 28.0 turns and a resistance of 0.780 Î&co...

Q: A 100-turn square wire coil of area 0.040

A 100-turn square wire coil of area 0.040 m2 rotates about a vertical axis at 1500 rev/min, as indicated in Figure P20.32. The horizontal component of Earth’s magnetic field at the l...

Q: Considerable scientific work is currently under way to determine whether weak oscillating

Considerable scientific work is currently under way to determine whether weak oscillating magnetic fields such as those found near outdoor electric power lines can affect human health. One study indic...

Q: A flat coil enclosing an area of 0.10 m2 is

A flat coil enclosing an area of 0.10 m2 is rotating at 60 rev/s, with its axis of rotation perpendicular to a 0.20-T magnetic field. (a) If there are 1 000 turns on the coil, what is the maximum volt...

Q: A generator connected to the wheel or hub of a bicycle can

A generator connected to the wheel or hub of a bicycle can be used to power lights or small electronic devices. A typical bicycle generator supplies 6.00 V when the wheels rotate at ω = 20.0 rad/s. (a...