Questions from College Physics

Q: Find the magnetic field at point P, the midpoint of the

Find the magnetic field at point P, the midpoint of the top side of the square.

Q: (a) Find the value of a single capacitor to replace

(a) Find the value of a single capacitor to replace the three capacitors in the diagram. (b) What is the potential difference across the 12 µF capacitor at the left side of the diagram?...

Q: 4A strip of copper 2.0 cm wide carries a current

4A strip of copper 2.0 cm wide carries a current I = 30.0 A to the right. The strip is in a magnetic field B = 5.0 T into the page. (a) What is the direction of the average magnetic force on the cond...

Q: Rank the final speeds of the three rocks.

Rank the final speeds of the three rocks.

Q: When you eat a pizza that has just come from the oven

When you eat a pizza that has just come from the oven, why is it that you are apt to burn the roof of your mouth with the first bite although the crust of the pizza feels only warm to your hand?

Q: Why must a camera or a projector use a converging lens?

Why must a camera or a projector use a converging lens? Why must the objective of a microscope or telescope be a converging lens (or a converging mirror)? Why can the eyepiece of a telescope be either...

Q: The volume of a solid cube with side s0 at temperature

The volume of a solid cube with side s0 at temperature T0 is . Show that if Δs ≪ s0, the change in volume ΔV due to a change in temperature ΔT is...

Q: One way to determine the location of your center of gravity is

One way to determine the location of your center of gravity is shown in the diagram. A 2.2 m long uniform plank is supported by two bathroom scales, one at either end. Initially the scales each read 1...

Q: Pure water has very few ions (about 1.2 ×

Pure water has very few ions (about 1.2 × 1014 ions per cubic centimeter), giving it a high resistivity, about 1 × 105 Ω·m at 37°C. Blood plasma has a much lower resistivity of roughly 0.6 Ω·m at 37°C...

Q: Make a figure analogous to Fig. 21.5 for an

Make a figure analogous to Fig. 21.5 for an ideal inductor in an ac circuit. Start by assuming that the voltage across an ideal inductor is vL(t) = VL sin ωt. Make a graph showing one cycle of vL(t) a...