Questions from College Physics

Q: (a) If the resistance R1 decreases, what happens to

(a) If the resistance R1 decreases, what happens to the voltage drop across R3? The switch S is still open, as in the figure. (b) If the resistance R1 decreases, what happens to the voltage drop acro...

Q: (a) Calculate the change in potential energy of 1 kg

(a) Calculate the change in potential energy of 1 kg of water as it passes over Niagara Falls (a vertical descent of 50 m). (b) At what rate is gravitational potential energy lost by the water of the...

Q: Rank the points in order of kinetic energy, from greatest to

Rank the points in order of kinetic energy, from greatest to least, assuming no friction or air resistance.

Q: Four identical incandescent lightbulbs are placed in two different circuits with identical

Four identical incandescent lightbulbs are placed in two different circuits with identical batteries. Bulbs A and B are connected in series with the battery. Bulbs C and D are connected in parallel ac...

Q: Six wires are characterized by their dimensions and by the metal they

Six wires are characterized by their dimensions and by the metal they are made from. Assume the tungsten alloy has exactly twice the resistivity of aluminum. Rank the wires in order of decreasing resi...

Q: A 500 W electric heater unit is designed to operate with an

A 500 W electric heater unit is designed to operate with an applied potential difference of 120 V. (a) If the local power company imposes a voltage reduction to lighten its load, dropping the voltage...

Q: Three identical incandescent lightbulbs are connected in a circuit as shown in

Three identical incandescent lightbulbs are connected in a circuit as shown in the diagram. (a) What happens to the brightness of the remaining bulbs if bulb A is removed from the circuit and replace...

Q: A 0.030 kg bullet is fired vertically at 200 m

A 0.030 kg bullet is fired vertically at 200 m/s into a 0.15 kg baseball that is initially at rest. The bullet lodges in the baseball and, after the collision, the baseball/bullet rise to a height of...

Q: To escape a burning building, Arnold has to jump from a

To escape a burning building, Arnold has to jump from a third- story window that is about 10 m above the ground. Arnold is worried about breaking his leg. The largest bone in Arnold’s leg is the femur...

Q: Does it take more force to tear a longer tendon or a

Does it take more force to tear a longer tendon or a shorter tendon? Assume the tendons are identical except for their lengths and are ideal—there are no weak points. Does it take more energy to tear...