_1. Maria is standing on a frictionless rotating turntable. When she extend her arms horizontally, her angularmomentum willa) increase b) decrease c) remain constant d)none of these_2. When a body is in mechanical equilibriuma) it is moving with constant acceleration c) it is moving with constant velocityb) it is being acted by a constant force d) the sum of all external forces acting on it is zero_3. A 3.0 kg particle is moving at a constant speed of 4.0 m/s along the direction of r= i+2j . What is the angularmomentum respect to the origin?a) 12 kgim2/s b) -12 kgìm2/s c) 125 kgìm2/s d) zero

_1. Maria is standing on a frictionless rotating turntable. When she extend her arms horizontally, her angular momentum will a) increase b) decrease c) remain constant d)none of these _2. When a body is in mechanical equilibrium a) it is moving with constant acceleration c) it is moving with constant velocity 5) it is being acted by a constant force d) the sum of all external forces acting on it is zero _3. A 3.0 kg particle is moving at a constant speed of 4.0 m/s along the direction of Fi+2j . What is the angular nomentum respect to the origin? a) 12 kgìm2/s b) -12 kgìm2/s c) 125 kgìm2/s d) zero

_1. Maria is standing on a frictionless rotating turntable. When she extend her arms horizontally, her angular momentum will a) increase b) decrease c) remain constant d)none of these _2. When a body is in mechanical equilibrium a) it is moving with constant acceleration c) it is moving with constant velocity 5) it is being acted by a constant force d) the sum of all external forces acting on it is zero _3. A 3.0 kg particle is moving at a constant speed of 4.0 m/s along the direction of Fi+2j . What is the angular nomentum respect to the origin? a) 12 kgìm2/s b) -12 kgìm2/s c) 125 kgìm2/s d) zero

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter10: Rotational Motion And Angular Momentum

Section: Chapter Questions

Problem 15CQ: Suppose a child gets off a rotating merry-go-round, Does the angular velocity of the merry-go-round...

See similar textbooks

Similar questions

Starting with the formula for the moment of inertia of a rod rotated around an axis through one end perpendicular to its length (I=Ml2/3) , prove that the moment of inertia of a rod rotated about an axis through its center perpendicular to its length is I=Ml2/12 . You will find the graphics in Figure 10.12 useful in visualizing these rotations.
A cat usually lands on its feet regardless of the position from which it is dropped. A slow-motion film of a cat falling shows that the upper half of its body twists in one direction while the lower half twists in the opposite direction. (See Fig. CQ11.10.) Why does this type of rotation occur?
A worker applies a torque to a nut with a wrench 0.500 m long. Because of the cramped space, she must exert a force upward at an angle of 60.0 with respect to a line from the nut through the end of the wrench. If the force she exerts has magnitude 80.0 N, what magnitude torque does she apply to the nut?
Suppose two long straight wires run perpendicular to one another without touching. Does one exert a net force on the other? If so, what is its direction? Does one exert a net torque on the other? If so, what is its direction? Justify your responses by using the right hand rules.
An object is acted on by a single nonzero force of magnitude F. (a) Is it possible for the object to have zero acceleration a? (b) Is it possible for the object to have zero angular acceleration ? (c) Is it possible for the object to be in mechanical equilibrium?
Four objectsa hoop, a solid cylinder, a solid sphere, and a thin, spherical shelleach have a mass of 4.80 kg and a radius of 0.230 m. (a) Find the moment of inertia for each object as it rotates about the axes shown in Table 8.1. (b) Suppose each object is rolled down a ramp. Rank the translational speed of each object from highest to lowest, (c) Rank the objects rotational kinetic energies from highest to lowest as the objects roll down the ramp.
An automobile engine can produce 200 N m of torque. Calculate the angular acceleration produced if 95.0% of this torque is applied to the drive shaft, axle, and rear wheels of a car, given the following information. The car is suspended so that the wheels can turn freely. Each wheel acts like a 15.0 kg disk that has a 0.180 m radius. The walls of each tire act like a 2.00-kg annular ring that has inside radius of 0.180 m and outside radius of 0.320 m. The tread of each tire acts like a 10.0-kg hoop of radius 0.330 m. The 14.0-kg axle acts like a rod that has a 2.00-cm radius. The 30.0-kg drive shaft acts like a rod that has a 3.20-cm radius.
Two window washers. Bob and Joe, are on a 3.00-m-long, 345-N scaffold supported by two cables attached to its ends. Bob weighs 750 N and stands 1.00 m from the left end, as shown in Figure P8.82. Two meters from the left end is the 500-N washing equipment. Joe is 0.500 m from the right end and weighs 1 000 N. Given that the scaffold is in rotational and translational equilibrium, what are the forces on each cable? Figure P8.82
A wrecking ball is being used to knock down a building. One tall unsupported concrete wall remains standing. If the wrecking ball hits the wall near the top, is the wall more likely to fall over by rotating at its base or by falling straight down? Explain your answer. How is it most likely to fall if it is struck with the same force at its base? Note that this depends on how firmly the wall is attached at its base.
When tightening a bolt, you push perpendicularly on a wrench with a force of 165 N at a distance of 0.140 m from the center of the bolt. (a) How much torque are you exerting in newton meters (relative to the center of the bolt)? (b) Convert this torque to foot pounds.
A bar on a hinge starts from rest and rotates with an angular acceleration = 10 + 6t, where is in rad/s2 and t is in seconds. Determine the angle in radians through which the bar turns in the first 4.00 s.
Suppose a child gets off a rotating merry-go-round, Does the angular velocity of the merry-go-round increase, decrease, or remain the same if: (a) He jumps off radially? (b) He Jumps backward to land motionless? (c) He jumps straight up and hangs onto an overhead tree branch? (d) He jumps off forward, tangential to the edge? Explain your answers. (Refer to Figure 10.34).