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Two wheels have the same mass and radius of 4.3 kg and 0.50 m, respectively. One has
(a) the shape of a hoop and the other
(b) the shape of a solid disk. The wheels start from rest and have a constant angular acceleration with respect to a rotational axis that is perpendicular to the plane of the wheel at its center. Each turns through an angle of 12 rad in 9.2 s. Find the net external torque that acts on each wheel.
An eye has trouble seeing an object closer than 60 cm but needs to see objects at 25 cm from it. find the focal length of a correctly prescribed contact lens
A thin film of oil (n = 1.29) is located on smooth, wet pavement. What is the minimum thickness of the oil film
A CD rotating at 1200 rpm starts slowing down at a constant rate such that, after the first two seconds, it has made 10 rotations. Find the time needed for the CD to come to rest
Gadolinium sulphate obeys Langevin's theory of paramagnetism down to a few degrees Kelvin, Determine the degree of magnetic saturation in this salt at a temperature of 2K in a field of flux density 2 weber/m^2
A 2.00-mol sample of hydrogen gas is heated at constant pressure from 302 K to 414 K. Calculate the increase in its internal energy
The box is open at the top and has edge length L = 66 cm. Find out (a) the x coordinate, (b) the y coordinate, and (c) the z coordinate of the center of mass of the box.
The diameter of a specific copper wire is 8.364 mm, Find the resistance of a 1.2 km length of such wire used for power transmission..
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 5.47 m/s. The car is a distance d away, What is the maximum possible value for d
In the rainy season, the amazon flows fast and runs deep. In one location, the river is 23m deep and moves at a speed of 4.0m/s toward the east. what is the potential (magnitude and sign) at the surface
A box starts out at the top of a frictionless ramp, then slides down. The ramp has a height h = 2 meters, What is the kinetic energy of the box at the bottom of the ramp
A couple is defined as two parallel forces, separated by a distance, that have equal magnitudes but opposite directions. A couple only produces a rotation in a specified direction. The moment produced by a couple is known as a couple moment.
An aluminum rod is 17.0 cm long at 20°C and has a mass of 350 g. what is the change in length of the rod
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