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A grinding wheel of radius 0.36 m, which starts from rest, rotates at 1850 revolutions per minute (RPM) and has a moment of inertia of 600 kg m2.
a. What is the angular momentum of the grinding wheel?
b. If torque (T) is defined as the change in angular momentum divided by time, how much torque is required to stop the grinding wheel in four seconds? In one second?
c. Discuss the meaning of the law of conservation of angular momentum. Your response should include the following at a minimum: How is angular momentum affected by changes to the radius of the circle or the speed of the object? How does torque affect angular momentum? What is the linear momentum equivalent of torque?
The earth orbits the sun once a year (3.16 x 10^7 s) in a nearlycircular orbit of radius 1.50 x 10^11 m. With respect to the sun,determine the magnitude of the earth’s centripetal acceleration.
Use 9.81 for the magnitude of the acceleration due to gravity.
Despite what you see in science fiction movies, we don't know howto make artificial gravity. However, we can make something thatseems like gravity if we work in a rotating reference frame.Suppose NASA builds a space station as a 1000-m-diameter cy..
In a mall, a shopper rides up an escalator between floors. At the top of the escalator, the shopper turns right and walks 12.79 m to a store. At what angle is the escalator inclined above the horizontal
A 740 gram grinding wheel 21.5 cm in diameter is in the shape of a uniform solid disk. What torque does friction exert while the wheel is slowing down
A .228g wires are stretched between two points 77.20 cm apart. The tension in the wire is 618N. Find the frequency of the first harmonic. Reply in units of Hz.
The temperature of 2.10 kg of water is 34 °C. To cool the water, ice at 0 °C is added to it. The desired final temperature of the water is 11 °C, determine how much mass m of ice should be added.
Prior to being placed in its hole, a uniform utility pole of weight 5630 N and length 9.1 m makes some nonzero angle with the vertical. Find the magnitude of the force exerted by the ground on the pole
During half a rotation the flywheel has to absorb 1000 J of energy. If the maximum permissible speed fluctuation is ± 60 RPM, what is the minimum rotational inertia of the flywheel? Assume there is no friction.
A truck moving with a speed of 25.4 m/s strikes a parked car. During the collision the truck and car stick together and slide to a stop together. How far does the truck/car combination slide
Two generators use the same magnetic field and operate at the same frequency. Find the coil radius r of this other generator
An ice cube of volume 8.5 cm3 is initially at a temperature of -16.5°C. Determine how much heat is required to convert this ice cube into steam
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