Questions from College Physics

Q: Gold is the most ductile of all metals. For example,

Gold is the most ductile of all metals. For example, one gram of gold can be drawn into a wire 2.40 km long. The density of gold is 19.3 x 103 kg/m3, and its resistivity is 2.44 x 10-8 Ω · m. What is...

Q: An air-filled parallel-plate capacitor with capacitance C0 stores

An air-filled parallel-plate capacitor with capacitance C0 stores charge Q on plates separated by distance d. The potential difference across the plates is ΔV0 and the energy stored is PEC,0. If the c...

Q: An aluminum calorimeter with a mass of 0.100 kg contains

An aluminum calorimeter with a mass of 0.100 kg contains 0.250 kg of water. The calorimeter and water are in thermal equilibrium at 10.0°C. Two metallic blocks are placed into the water. On...

Q: At what temperature will aluminum have a resistivity that is three times

At what temperature will aluminum have a resistivity that is three times the resistivity of copper at room temperature?

Q: At 20.0°C, the carbon resistor in an

At 20.0°C, the carbon resistor in an electric circuit connected to a 5.0 - V battery has a resistance of 2.0 x 102 Ω. What is the current in the circuit when the temperature of the carbon rises to 80....

Q: In the Bohr model of the hydrogen atom, an electron in

In the Bohr model of the hydrogen atom, an electron in the lowest energy state moves at a speed equal to 2.19 x 106 m/s in a circular path having a radius of 5.29 x 10-11 m. What is the effective curr...

Q: A wire 3.00 m long and 0.450 mm2

A wire 3.00 m long and 0.450 mm2 in cross - sectional area has a resistance of 41.0 Ω at 20.0°C. If its resistance increases to 41.4 Ω at 29.0°C, what is the temperature coefficient of resistivity?

Q: (a) A 34.5 - m length of copper

(a) A 34.5 - m length of copper wire at 20.0°C has a radius of 0.25 mm. If a potential difference of 9.0 V is applied across the length of the wire, determine the current in the wire. (b) If the wire...

Q: An engineer needs a resistor with a zero overall temperature coefficient of

An engineer needs a resistor with a zero overall temperature coefficient of resistance at 20.0°C. She designs a pair of circular cylinders, one of carbon and one of Nichrome as shown in Fig...

Q: In one form of plethysmograph (a device for measuring volume),

In one form of plethysmograph (a device for measuring volume), a rubber capillary tube with an inside diameter of 1.00 mm is filled with mercury at 20°C. The resistance of the mercury is measured with...