Questions from Modern Physics

Q: Three thin lenses, each with a focal length of 40.

Three thin lenses, each with a focal length of 40.0 cm, are aligned on a common axis; adjacent lenses are separated by 52.0 cm. Find the position of the image of a small object on the axis, 80.0 cm to...

Q: Calculate the magnitude of the force required to give a 0.

Calculate the magnitude of the force required to give a 0.145-kg baseball an acceleration a = 1.00 m/s2 in the direction of the baseball’s initial velocity when this velocity has a magnitude of a. 10...

Q: If a muon is traveling at 0.999c, what are

If a muon is traveling at 0.999c, what are its momentum and kinetic energy? (The mass of such a muon at rest in the laboratory is 207 times the electron mass.)

Q: A proton (rest mass 1.67 * 10-27

A proton (rest mass 1.67 * 10-27 kg) has total energy that is 4.00 times its rest energy. What are a. the kinetic energy of the proton; b. the magnitude of the momentum of the proton; c. the speed...

Q: A person with a near point of 85 cm, but excellent

A person with a near point of 85 cm, but excellent distant vision, normally wears corrective glasses. But he loses them while traveling. Fortunately, he has his old pair as a spare. a. If the lenses...

Q: A point charge q1 = +2.40 µC is held

A point charge q1 = +2.40 µC is held stationary at the origin. A second point charge q2 = -4.30 µC moves from the point x = 0.150 m, y = 0 to the point x = 0.250 m, y = 0.250 m. How much work is done...

Q: You have two capacitors and want to connect them across a voltage

You have two capacitors and want to connect them across a voltage source (battery) to store the maximum amount of energy. Should they be connected in series or in parallel?

Q: The current in a wire varies with time according to the relationship

The current in a wire varies with time according to the relationship I = 55 A – (0.65 A/s2) t2. (a). How many coulombs of charge pass a cross section of the wire in the time interval between t = 0 an...

Q: Current passes through a solution of sodium chloride. In 1.

Current passes through a solution of sodium chloride. In 1.00 s, 2.68 × 1016 Na+ ions arrive at the negative electrode and 3.92 × 1016 Cl- ions arrive at the positive electrode. (a). What is the curr...

Q: During lightning strikes from a cloud to the ground, currents as

During lightning strikes from a cloud to the ground, currents as high as 25,000 A can occur and last for about 40 µs. How much charge is transferred from the cloud to the earth during such a strike?