27.The fundamental dimensions of angular momentum are:Amass·length·time^−1Bmass·length^−2·time^−2Cmass^2·time^−1Dmass·length^2·time^−2Enone of these

28.Possible units of angular momentum are:

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29.The newton·second is a unit of:

30.A rod rests on frictionless ice. Forces that are equal in magnitude and oppositein direction are then simultaneously applied to its ends as shown. The quantity thatis zero is its:

31.A 2.0-kg stone is tied to a 0.50-m long string and swung around a circle at aconstant angular velocity of 12 rad/s. The net torque on the stone about the centerof the circle is:A0B6.0N · mC12N · mD72N · mE140N · m32.A man, with his arms at his sides, is spinning on a light frictionless turntable.When he extends his arms:Ahis angular velocity increasesBhis angular velocity remains the sameChis rotational inertia decreasesDhis rotational kinetic energy increasesEhis angular momentum remains the same

33.A machine part is made up of two pieces, with centers of gravity shown in theFigure. Which point could the center of gravity of the entire part?

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34.A student lies on a weightless board atop two scales as shown in the figure.What is the student’s weight?

35.A father (mass 2ᵅ
) and his son (mass ᵅ
) begin walking towards opposite endsof a balanced see-saw. As they walk, the see-saw stays exactly horizontal. How dotheir speeds compare?

36.Due to Mr. Hart’s teacher salary, he is required to obtain a job over thesummer pushing children on a merry-go round. In order to make the job easier, Mr.Hart shouldAPlace all the children on the outer edge of the circle, spread out evenlyBPlace all the children on the outer edge, concentrated on one sideCPlace all the children in a line going through the diameter of the circle.DPlace the children in the center of the circle.

37.The pulley system consists of two solid disks of different radii fastenedtogether coaxially, with two different masses connected to the pulleys as shown.Under what condition will this pulley system be in static equilibrium?Arm=RMBr2m=R2MCrM=RmDr2M=R2m38.A dumbbell consists of two masses m connected by a rigid rod of negligiblemass and length d. A physics student takes the dumbbell and rotated it aboutits center of mass with an angular velocity ω, giving it an angular momentumL1. The student then takes a second dumbbell, with masses 2m and length 2d,and rotates them with the same angular velocity ω. What is the angularmomentum L2 of this second dumbbell?A2L1B4L1C6L1D8L1Page 8 of 9

39.A solid sphere of diameter x and mass 2m is fastened to a long thin rod oflength 4x and mass m as shown. Where is the location of the center of mass of thissystem?

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