Questions from Modern Physics

Q: A 4.00-kg block is attached to a vertical

A 4.00-kg block is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended as shown in Fig. P5.104 and the tension in the upper...

Q: On the ride “Spindletop” at the amusement park Six Flags

On the ride “Spindletop” at the amusement park Six Flags Over Texas, people stood against the inner wall of a hollow vertical cylinder with radius 2.5 m. The cylinder started to rotate, and when it re...

Q: A 70-kg person rides in a 30-kg cart

A 70-kg person rides in a 30-kg cart moving at 12 m/s at the top of a hill that is in the shape of an arc of a circle with a radius of 40 m. (a) What is the apparent weight of the person as the cart p...

Q: A small bead can slide without friction on a circular hoop that

A small bead can slide without friction on a circular hoop that is in a vertical plane and has a radius of 0.100 m. The hoop rotates at a constant rate of 4.00 rev>s about a vertical diameter (Fig....

Q: A physics major is working to pay her college tuition by performing

A physics major is working to pay her college tuition by performing in a traveling carnival. She rides a motorcycle inside a hollow, transparent plastic sphere. After gaining sufficient speed, she tra...

Q: A helium balloon hovers in midair, neither ascending nor descending.

A helium balloon hovers in midair, neither ascending nor descending. Is it in equilibrium? What forces act on it?

Q: In your physics lab, a block of mass m is at

In your physics lab, a block of mass m is at rest on a horizontal surface. You attach a light cord to the block and apply a horizontal force to the free end of the cord. You find that the block remain...

Q: A road heading due east passes over a small hill. You

A road heading due east passes over a small hill. You drive a car of mass m at constant speed v over the top of the hill, where the shape of the roadway is well approximated as an arc of a circle with...

Q: You are an engineer working for a manufacturing company. You are

You are an engineer working for a manufacturing company. You are designing a mechanism that uses a cable to drag heavy metal blocks a distance of 8.00 m along a ramp that is sloped at 40.0° above the...

Q: A balky cow is leaving the barn as you try harder and

A balky cow is leaving the barn as you try harder and harder to push her back in. In coordinates with the origin at the barn door, the cow walks from x = 0 to x = 6.9 m as you apply a force with x-com...