Questions from College Physics

Q: A tungsten wire in a vacuum has length 15.0 cm

A tungsten wire in a vacuum has length 15.0 cm and radius 1.00 mm. A potential difference is applied across it. (a) What is the resistance of the wire at 293 K? (b) Suppose the wire reaches an equilib...

Q: If a battery is rated at 60.0 A · h

If a battery is rated at 60.0 A · h, how much total charge can it deliver before it goes “dead”?

Q: A car owner forgets to turn off the headlights of his car

A car owner forgets to turn off the headlights of his car while it is parked in his garage. If the 12.0 - V battery in his car is rated at 90.0 A · h and each headlight requires 36.0 W of power, how l...

Q: Consider an aluminum wire of diameter 0.600 mm and length

Consider an aluminum wire of diameter 0.600 mm and length 15.0 m. The resistivity of aluminum at 20.0°C is 2.82 x 1028 Ω · m. (a) Find the resistance of this wire at 20.0°C. (b) If a 9.00 - V battery...

Q: A given copper wire has a resistance of 5.00 Ω

A given copper wire has a resistance of 5.00 Ω at 20.0°C while a tungsten wire of the same diameter has a resistance of 4.75 Ω at 20.0°C. At what temperature will the two wires have the same resistanc...

Q: When a driver brakes an automobile, the friction between the brake

When a driver brakes an automobile, the friction between the brake drums and the brake shoes converts the car’s kinetic energy to thermal energy. If a 1500-kg automobile traveling at 30 m/s comes to a...

Q: A particular wire has a resistivity of 3.0 x 10

A particular wire has a resistivity of 3.0 x 10-8 Ω · m and a cross - sectional area of 4.0 x 10-6 m2. A length of this wire is to be used as a resistor that will develop 48 W of power when connected...

Q: Birds resting on high - voltage power lines are a common sight

Birds resting on high - voltage power lines are a common sight. The copper wire on which a bird stands is 2.2 cm in diameter and carries a current of 50. A. If the bird’s feet are 4.0 cm apart, calcul...

Q: An experiment is conducted to measure the electrical resistivity of Nichrome in

An experiment is conducted to measure the electrical resistivity of Nichrome in the form of wires with different lengths and cross - sectional areas. For one set of measurements, a student uses 30.0 -...

Q: A 50.0 - g sample of a conducting material is

A 50.0 - g sample of a conducting material is all that is available. The resistivity of the material is measured to be 11 x 10-8 Ω · m, and the density is 7.86 g/cm3. The material is to be shaped into...