Showing 61 to 70 of 391 Questions
  • A bicyclist traveling with speed v = 4.2 m/s on a flat road is making a turn with a radius r = 6.4 m. The forces acting on the cyclist and cycle are the normal force (Fn) and friction force (Ffr) exerted by the road on the tires, and mg, the total weight of the cyclist and cycle (see Fig. 8-56). (a) Explain carefully why the angle θ

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  • A block with mass m = 5.00 kg slides down a surface inclined 36.90 to the horizontal (Fig. 10.55). The coefficient of kinetic friction is 0.25. A string attached to the block is wrapped around a flywheel on a fixed axis at O. The flywheel has mass 25.0 kg and moment of inertia 0.500 kg • m2 with respect to the n axis of rotation. The st

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    460
  • A block with mass m is revolving with linear speed v, in a circle of radius r, on a frictionless horizontal surface (see Fig. 10.48). The string is slowly pulled from below until the radius of the circle in which the block is revolving is reduced to r2.(a) Calculate the tension T in the string as a function of r, the distance of the block

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  • A bowling ball of mass 7.3 kg and radius 9.0 cm rolls without slipping down a lane at 3.3m/s. Calculate its total kinetic energy.

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    338
  • A car starts from rest and moves around a circular track of radius 30.0 m. Its speed increases at the constant rate of 0.500 m/s2(a) What is the magnitude of its net linear acceleration 15.0 s later?(b) What angle does this net acceleration vector make with the car's velocity at this time?

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    279
  • A centrifuge accelerates uniformly from rest to 15,000 rpm in 220s. Through how many revolutions did it turn in this time?

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    593
  • A centrifuge rotor has a moment of inertia of 3.75 x 10-2 kg m2. How much energy is required to bring it from rest to 8250 rpm?

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    815
  • A centrifuge rotor rotating at 10,300 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.20 m N. If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710m, through how many revolutions will the rotor turn before coming to rest, and how long will it take?

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    677
  • A child rolls a 0.600-kg basketball up a long ramp. The basketball can be considered a thin-walled, hollow sphere. When the child releases the basketball at the bottom of the ramp, it has a speed of 8.0 m/s. When the ball returns to her after rolling up the ramp and then rolling back down, it has a speed of 4.0 m/s. Assume the work done b

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    377
  • A child rolls a ball on a level floor 3.5m to another child. If the ball makes 15.0 revolutions what is its diameter?

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    537