Questions from College Physics

Q: (a) What is the equivalent resistance between points A and

(a) What is the equivalent resistance between points A and B? (b) A 276 V emf is connected to the terminals A and B. What is the current in the 12 Ω resistor?

Q: Poiseuille's law [Eq. (9-41)] gives the

Poiseuille's law [Eq. (9-41)] gives the volume flow rate of a viscous fluid through a pipe. (a) Show that Poiseuille's law can be written in the form ΔP = IR, where I = ΔV/Δt represents the volume fl...

Q: You are riding your bicycle and approaching a rather steep hill.

You are riding your bicycle and approaching a rather steep hill. Which gear should you use to go uphill, a low gear or a high gear? With a low gear the wheel rotates less than with a high gear for one...

Q: Five ideal mass-spring systems are described in Problem 36.

Five ideal mass-spring systems are described in Problem 36. Rank them in decreasing order of their total energy.

Q: The rotor is an amusement park ride where people stand against the

The rotor is an amusement park ride where people stand against the inside of a cylinder. Once the cylinder is spinning fast enough, the floor drops out. (a) What force keeps the people from falling o...

Q: A tightrope walker who weighs 640 N walks along a steel cable

A tightrope walker who weighs 640 N walks along a steel cable. When he is halfway across, the cable makes an angle of 0.040 rad below the horizontal. (a) What is the strain in the cable? Assume the c...

Q: Explain why it is easier to drive a wood screw using a

Explain why it is easier to drive a wood screw using a screwdriver with a large-diameter handle rather than one with a thin handle.

Q: In a region where there is an electric field, the electric

In a region where there is an electric field, the electric forces do +8.0 × 10−19 J of work on an electron as it moves from point X to point Y. (a) Which point, X or Y, is at a higher potential? (b)...

Q: One way to find the center of gravity of an irregular flat

One way to find the center of gravity of an irregular flat object is to suspend it from various points so that it is free to rotate. When the object hangs in equilibrium, a vertical line is drawn down...

Q: One of the effects of significant global warming is the melting of

One of the effects of significant global warming is the melting of part or all of the polar ice caps. This, in turn, would change the length of the day (the period of Earth's rotation). Explain why. W...