Questions from College Physics

Q: (a) In a charging RC circuit, how many time

(a) In a charging RC circuit, how many time constants have elapsed when the capacitor has 99.0% of its final charge? (b) How many time constants have elapsed when the capacitor has 99.90% of its fina...

Q: A proton moves in a helical path at speed v = 4

A proton moves in a helical path at speed v = 4.0 × 107 m/s high above the atmosphere, where Earth's magnetic field has magnitude B = 1.0 × 10−6 T. The proton's velocity makes an angle of 25° with the...

Q: Using a mass spectrometer, the mass of the /

Using a mass spectrometer, the mass of the / ion is found to be 238.050 24 u. (a) Use this result to calculate the mass of the / nucleus. (b) Now find the binding energy of the / nucleus.

Q: A 20 µF capacitor is discharged through a 5.0 kΩ

A 20 µF capacitor is discharged through a 5.0 kΩ resistor. The initial charge on the capacitor is 200 µC. (a) Sketch a graph of the current through the resistor as a function of time. Label both axes...

Q: A naval aviator had to eject from her plane before it crashed

A naval aviator had to eject from her plane before it crashed at sea. She is rescued from the water by helicopter and dangles from a cable that is 45 m long while being carried back to the aircraft ca...

Q: In each of five situations, two point charges (Q1,

In each of five situations, two point charges (Q1, Q2) are separated by a distance d. Rank them in order of the electric potential energy, from highest to lowest. (a) Q1 = 1 µC, Q2 = 2 µC, d = 1 m (b)...

Q: Consider the circuit in the diagram. After the switch S has

Consider the circuit in the diagram. After the switch S has been closed for a long time, what are the current through the 12 Ω resistor and the voltage across the capacitor?

Q: A parallel plate capacitor used in a flash for a camera must

A parallel plate capacitor used in a flash for a camera must be able to store 32 J of energy when connected to 300 V. (Most electronic flashes actually use a 1.5 to 6.0 V battery, but increase the eff...

Q: The average speed of blood in the aorta is 0.3

The average speed of blood in the aorta is 0.3 m/s, and the radius of the aorta is 1 cm. There are about 2 × 109 capillaries with an average radius of 6 μm. What is the approximate average speed of th...

Q: In Example 6.1, find the work done by the

In Example 6.1, find the work done by the movers as they slide the chest up the ramp if the coefficient of friction between the chest and the ramp is 0.20.