Questions from College Physics

Q: An unmarked police car starts from rest just as a speeding car

An unmarked police car starts from rest just as a speeding car passes at a speed of v. If the police car speeds up with a constant acceleration of a, what is the speed of the police car when it catche...

Q: The current in a 0.080 H solenoid increases from 20

The current in a 0.080 H solenoid increases from 20.0 mA to 160.0 mA in 7.0 s. Find the average emf in the solenoid during that time interval.

Q: An experiment similar to Example 25.1 is performed; the

An experiment similar to Example 25.1 is performed; the power at the receiver as a function of x is shown in the figure. (a) Approximately what is the wavelength of the microwaves? (b) If the amplit...

Q: A skier with a mass of 63 kg starts from rest and

A skier with a mass of 63 kg starts from rest and skis down an icy (frictionless) slope that has a length of 50 m at an angle of 32° with respect to the horizontal. At the bottom of the slope, the pat...

Q: A sports car traveling along a straight line increases its speed from

A sports car traveling along a straight line increases its speed from 20.0 mi/h to 60.0 mi/h. (a) What is the ratio of the final to the initial magnitude of its momentum? (b) What is the ratio of th...

Q: A steep cliff west of Lydia's home reflects a 1020 kHz radio

A steep cliff west of Lydia's home reflects a 1020 kHz radio signal from a station that is 74 km due east of her home. If there is destructive interference, what is the minimum distance of the cliff f...

Q: A 2.00 µF capacitor is charged using a 5.

A 2.00 µF capacitor is charged using a 5.00 V battery, and a 3.00 µF capacitor is charged using a 10.0 V battery. (a) What is the total energy stored in the two capacitors? (b) The batteries are dis...

Q: An engineer in a train moving toward the station with a velocity

An engineer in a train moving toward the station with a velocity v = 0.60c lights a signal flare as he reaches a marker 1.0 km from the station (according to a scale laid out on the ground). By how mu...

Q: Fill in the missing algebraic steps in the derivation of the time

Fill in the missing algebraic steps in the derivation of the time dilation equation [Eq. (26-4)].

Q: The light-second is a unit of distance; 1 light

The light-second is a unit of distance; 1 light-second is the distance that light travels in 1 second. (a) Find the conversion between light-seconds and meters: 1 light-second = ? m. (b) What is the s...