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a 120kg horizontal flywheel with a 0.5m radius rotates friction-free about an axis through its center. A rope is wrapped around the outside of the flywheel and a steady pull of 60.0N is exrted on the rope. The flywheel starts from rest and is unwound in 4 seconds. The moment of inertia of a disk is 1/2MR^2.
A) what is the torque applied to the wheel?
B) what is the angular acceleration of the flywheel?
C) How many rotations does the flywheel make?
D) What is the length of rope needed?
A point charge is moved in an electric field. The potential changes from -87 V to +30 V between the initial and final position. The work done by the electric field is 156 J
A moon orbits a planet of unknown mass with a period of 1.8 days. If the radius of the moon's orbit is 420,000,000 meters, find the mass of the planet
Assume the wheel has a constant negative angular acceleration of magnitude 2.50 rad/s2. Explain through how many radians has the wheel turned during the interval found in (a) which is 4.98?
A BB gun shoots pellets so that their velocity is given by v = (-5.00 107) t 2 + (2.80 105) t, Determine the length of time the pellet is accelerated
For the real or imaginary nucleus of 70X170, find the net electrical charge of the nucleus and the approximate radius of the nucleus
A circuit consists of a battery connected to three resistors (65?, 26?, and 170?) in parallel. find the current through each resistor
In an interstellar gas cloud at 48.2 K, the pressure is 1.16 x 10-8 Pa. what is their mean free path
A football is kicked off at a speed of 24 m/s at 30 degree about the horizontal and lands on the field. What is the horizontal distance from the starting point
The first and second electron shells of an element are filled and there are five electrons in the third electron shell
A ball of mass 1.020 g and positive charge q =45.2 microC is suspended on a string of negligible mass in a uniform electric field. We view that the ball hangs at an angle of theta=15.0 from the vertical. What is the magnitude of the electric field.
A pair of slits separated by 1.3 mm, are illuminated with monochromatic light of wavelength 573 nm. What is the thickness of the glass
Two converging lenses having focal lengths of f1 = 10.9 cm and f2 = 20.0 cm are placed d = 50.0 cm apart. What is the overall magnification of the system
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