Questions from College Physics

Q: The armature of an ac generator is a rectangular coil 2.

The armature of an ac generator is a rectangular coil 2.0 cm by 6.0 cm with 80 turns. It is immersed in a uniform magnetic field of magnitude 0.45 T. If the amplitude of the emf in the coil is 17.0 V,...

Q: 11. The magnetic forces that two parallel wires with unequal currents

11. The magnetic forces that two parallel wires with unequal currents flowing in opposite directions exert on each other are (a) attractive and unequal in magnitude. (b) repulsive and unequal in magni...

Q: Write the symbol (in the form / ) for

Write the symbol (in the form / ) for the nuclide that has 78 neutrons and 53 protons.

Q: Consider the three ideal polarizing filters shown in the figure. The

Consider the three ideal polarizing filters shown in the figure. The angles listed indicate the direction of the transmission axis of each polarizer with respect to the vertical. (a) If unpolarized l...

Q: Wires that carry telephone signals or Internet data are twisted. The

Wires that carry telephone signals or Internet data are twisted. The twisting reduces the noise on the line from nearby electric devices that produce changing currents. How does the twisting reduce no...

Q: You throw a ball up with initial speed vi, and when

You throw a ball up with initial speed vi, and when it reaches its high point at height h, you throw another ball into the air with the same initial speed vi. Will the two balls cross at half the heig...

Q: Samantha goes kayaking on a straight river. After she has paddled

Samantha goes kayaking on a straight river. After she has paddled upstream for a while, she realizes she dropped a lifejacket overboard when she launched so she turns around and paddles downstream to...

Q: High-voltage power lines run along the edge of a farmer’s

High-voltage power lines run along the edge of a farmer’s field. Describe how the farmer might be able to steal electric power without making any electrical connection to the power line. (Yes, it work...

Q: Explain the theory behind the pressure cooker. How does it speed

Explain the theory behind the pressure cooker. How does it speed up cooking times?

Q: The United States and Canada use 120 V rms as the standard

The United States and Canada use 120 V rms as the standard household voltage, whereas most of the rest of the world uses 240 V rms for the household standard. What are the advantages and disadvantages...