Questions from Modern Physics


Q: A light, flexible rope is wrapped several times around a hollow

A light, flexible rope is wrapped several times around a hollow cylinder, with a weight of 40.0 N and a radius of 0.25 m, that rotates without friction about a fixed horizontal axis. The cylinder is a...

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Q: A frictionless pulley has the shape of a uniform solid disk of

A frictionless pulley has the shape of a uniform solid disk of mass 2.50 kg and radius 20.0 cm. A 1.50-kg stone is attached to a very light wire that is wrapped around the rim of the pulley (Fig. E9.4...

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Q: A bucket of mass m is tied to a massless cable that

A bucket of mass m is tied to a massless cable that is wrapped around the outer rim of a frictionless uniform pulley of radius R, similar to the system shown in Fig. E9.43. In terms of the stated vari...

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Q: A thin, light wire is wrapped around the rim of a

A thin, light wire is wrapped around the rim of a wheel (Fig. E9.45). The wheel rotates without friction about a stationary horizontal axis that passes through the center of the wheel. The wheel is a...

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Q: A uniform 2.00-m ladder of mass 9.

A uniform 2.00-m ladder of mass 9.00 kg is leaning against a vertical wall while making an angle of 53.0° with the floor. A worker pushes the ladder up against the wall until it is vertical. What is t...

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Q: If we multiply all the design dimensions of an object by a

If we multiply all the design dimensions of an object by a scaling factor f, its volume and mass will be multiplied by f3. (a) By what factor will its moment of inertia be multiplied? (b) If a 1/48-sc...

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Q: Find the moment of inertia of a hoop (a thin-

Find the moment of inertia of a hoop (a thin-walled, hollow ring) with mass M and radius R about an axis perpendicular to the hoop’s plane at an edge.

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Q: About what axis will a uniform, balsa-wood sphere have

About what axis will a uniform, balsa-wood sphere have the same moment of inertia as does a thin-walled, hollow, lead sphere of the same mass and radius, with the axis along a diameter?

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Q: Tendons are strong elastic fibers that attach muscles to bones. To

Tendons are strong elastic fibers that attach muscles to bones. To a reasonable approximation, they obey Hooke’s law. In laboratory tests on a particular tendon, it was found that, when a 250-g objec...

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Q: A child is pushing a merry-go-round. The

A child is pushing a merry-go-round. The angle through which the merry-go-round has turned varies with time according to

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