Questions from Modern Physics

Q: A typical small flashlight contains two batteries, each having an emf

A typical small flashlight contains two batteries, each having an emf of 1.5 V, connected in series with a bulb having resistance 17 Ω. (a). If the internal resistance of the batteries is negligible,...

Q: In the circuit in Fig. E25.47, find

In the circuit in Fig. E25.47, find Fig. E25.47: (a). the rate of conversion of internal (chemical) energy to electrical energy within the battery; (b). the rate of dissipation of electrical energ...

Q: A “540-W” electric heater is designed to operate

A “540-W” electric heater is designed to operate from 120-V lines. (a). What is its operating resistance? (b). What current does it draw? (c). If the line voltage drops to 110 V, what power does th...

Q: The power rating of a light bulb (such as a 100

The power rating of a light bulb (such as a 100-W bulb) is the power it dissipates when connected across a 120-V potential difference. What is the resistance of? (a). a 100-W bulb and (b). a 60-W bu...

Q: A gold nucleus has a radius of 7.3 × 10

A gold nucleus has a radius of 7.3 × 10-15 m and a charge of +79e. Through what voltage must an alpha particle, with charge +2e, be accelerated so that it has just enough energy to reach a distance of...

Q: A small sphere with mass 5.00 × 10-7

A small sphere with mass 5.00 × 10-7 kg and charge +7.00 µC is released from rest a distance of 0.400 m above a large horizontal insulating sheet of charge that has uniform surface charge density

Q: When radium-226 decays radioactively, it emits an alpha particle

When radium-226 decays radioactively, it emits an alpha particle (the nucleus of helium), and the end product is radon-222. We can model this decay by thinking of the radium-226 as consisting of an al...

Q: A proton and an alpha particle are released from rest when they

A proton and an alpha particle are released from rest when they are 0.225 nm apart. The alpha particle (a helium nucleus) has essentially four times the mass and two times the charge of a proton. Find...

Q: A particle with charge +7.60 nC is in a

A particle with charge +7.60 nC is in a uniform electric field directed to the left. Another force, in addition to the electric force, acts on the particle so that when it is released from rest, it mo...

Q: Identical charges q = +5.00 µC are placed at

Identical charges q = +5.00 µC are placed at opposite corners of a square that has sides of length 8.00 cm. Point A is at one of the empty corners, and point B is at the center of the square. A charge...