Questions from Modern Physics

Q: A 50.0-kg grindstone is a solid disk 0

A 50.0-kg grindstone is a solid disk 0.520 m in diameter. You press an ax down on the rim with a normal force of 160 N (Fig. P10.54). The coefficient of kinetic friction between the blade and the ston...

Q: A grindstone in the shape of a solid disk with diameter 0

A grindstone in the shape of a solid disk with diameter 0.520 m and a mass of 50.0 kg is rotating at 850 rev/min. You press an ax against the rim with a normal force of 160 N (Fig. P10.54), and the gr...

Q: A uniform, 8.40-kg, spherical shell 50

A uniform, 8.40-kg, spherical shell 50.0 cm in diameter has four small 2.00-kg masses attached to its outer surface and equally spaced around it. This combination is spinning about an axis running thr...

Q: In Example 10.10 (Section 10.6) the

In Example 10.10 (Section 10.6) the angular speed v changes, and this must mean that there is nonzero angular acceleration. But there is no torque about the rotation axis if the forces the professor a...

Q: A thin, uniform, 3.80-kg bar,

A thin, uniform, 3.80-kg bar, 80.0 cm long, has very small 2.50-kg balls glued on at either end (Fig. P10.57). It is supported horizontally by a thin, horizontal, frictionless axle passing through its...

Q: You are designing a simple elevator system for an old warehouse that

You are designing a simple elevator system for an old warehouse that is being converted to loft apartments. A 22,500-N elevator is to be accelerated upward by connecting it to a counterweight by means...

Q: Figure P10.59 illustrates an Atwood’s machine. Find the linear

Figure P10.59 illustrates an Atwood’s machine. Find the linear accelerations of blocks A and B, the angular acceleration of the wheel C, and the tension in each side of the cord if t...

Q: The mechanism shown in Fig. P10.60 is used to

The mechanism shown in Fig. P10.60 is used to raise a crate of supplies from a ship’s hold. The crate has total mass 50 kg. A rope is wrapped around a wooden cylinder that turns on a metal axle. The c...

Q: A large 16.0-kg roll of paper with radius

A large 16.0-kg roll of paper with radius R = 18.0 cm rests against the wall and is held in place by a bracket attached to a rod through the center of the roll (Fig. P10.61). The rod turns without fri...

Q: A block with mass m = 5.00 kg slides down

A block with mass m = 5.00 kg slides down a surface inclined 36.9° to the horizontal (Fig. P10.62). The coefficient of kinetic friction is 0.25. A string attached to the block is wrapped ar...