Questions from Modern Physics

Q: A uniform disk with radius R = 0.400 m and

A uniform disk with radius R = 0.400 m and mass 30.0 kg rotates in a horizontal plane on a frictionless vertical axle that passes through the center of the disk. The angle through which the disk has t...

Q: A circular saw blade with radius 0.120 m starts from

A circular saw blade with radius 0.120 m starts from rest and turns in a vertical plane with a constant angular acceleration of 2.00 rev>s2. After the blade has turned through 155 rev, a small piece o...

Q: A roller in a printing press turns through an angle u1t2 given

A roller in a printing press turns through an angle u1t2 given by

Q: While a roofer is working on a roof that slants at 36

While a roofer is working on a roof that slants at 36° above the horizontal, he accidentally nudges his 85.0-N toolbox, causing it to start sliding downward from rest. If it starts 4.25 m from the low...

Q: A disk of radius 25.0 cm is free to turn

A disk of radius 25.0 cm is free to turn about an axle perpendicular to it through its center. It has very thin but strong string wrapped around its rim, and the string is attached to a ball that is p...

Q: You are designing a rotating metal flywheel that will be used to

You are designing a rotating metal flywheel that will be used to store energy. The flywheel is to be a uniform disk with radius 25.0 cm. Starting from rest at t = 0, the flywheel rotates with constant...

Q: You must design a device for shooting a small marble vertically upward

You must design a device for shooting a small marble vertically upward. The marble is in a small cup that is attached to the rim of a wheel of radius 0.260 m; the cup is covered by a lid. The wheel st...

Q: Engineers are designing a system by which a falling mass m imparts

Engineers are designing a system by which a falling mass m imparts kinetic energy to a rotating uniform drum to which it is attached by thin, very light wire wrapped around the rim of the drum (Fig. P...

Q: A vacuum cleaner belt is looped over a shaft of radius 0

A vacuum cleaner belt is looped over a shaft of radius 0.45 cm and a wheel of radius 1.80 cm. The arrangement of the belt, shaft, and wheel is similar to that of the chain and sprockets. The motor tur...

Q: The motor of a table saw is rotating at 3450 rev/

The motor of a table saw is rotating at 3450 rev/min. A pulley attached to the motor shaft drives a second pulley of half the diameter by means of a V-belt. A circular saw blade of diameter 0.208 m is...