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The Gravitron is an amusement park ride in which riders stand against the inner wall of a large spinning steel cylinder. At some point, the floor of the Graviton drops out, instilling the fear in riders that they will fall a great height. However, the spinning motion of the Gravitron allows them to remain safely inside the ride. Most Gravitrons feature vertical walls, but the example shown in the figure has tapered walls of 25.0o. According to knowledgeable sources, the coefficient of static friction between typical human clothing and steel ranges between 0.230 to 0.390. In the figure, the center of mass of a 54.6 kg rider resides 3.00 m from the axis of rotation. As a safety expert inspecting the safety of rides at a county fair, you want to reduce the chances of injury. What minimum rotational speed (expressed in rev/s) is needed to keep the occupants from sliding down the wall during the ride?
What is the maximum rotational speed at which the riders will not slide up the walls of the ride?
The current in a coil drops from 3.4 A to 2.8 A in 0.51 s. If the average emf induced in the coil is 12 mV, what is the self-inductance of the coil
An ?-particle has a charge of +2e and a mass of 6.64 × 10-27 kg. It is accelerated from rest through a potential difference that has a value of 1.75 × 106 V, what are the radius of its circular path
Explain in your own words the meaning of acute and chronic exposure, deterministic and stochastic effects from radiation. Give examples
The loop is leaving a region in which a 2.8 T magnetic field exists; the magnetic field outside this region is zero. During a time of 2.0 s, illustrate what is the magnitude of the change in the magnetic flux?
A spherical surface completely surrounds a collection of charges. Find the electric flux (with its sign) through the surface if the collection consists of (a) a single +1.90 × 10-6 C charge, (b) a single -2.40 × 10-6 C charge, and (c) both of the ..
Calculate the focal length required of glasses to be worn, A pair of eyeglasses are designed to allow a person with a near-point distance of 2.52 m to read a road sign at a distance of 25.2 m.
6 - two equal masses of charge 36 nC each are suspended at the end of two 1-m strings of negligible mass, The ropes make and angle of 5 with respect to each other
A baloon 1.2 g when empty has volume 800 cm ^3 and is filled with helium. density of air is 1.29 kg/m^3 while that of helium is .179 kg/m, calculate acceleration of balloon
Solar cells generate a potential difference when exposed to sunlight. In an experiment, you wish to charge a rechargeable battery by connecting it in series to an array of solar cells. What is the area of the array of solar cells
Two particles of charge Q(-L,0) and nQ(αL,0) where n = 10. When a third charge is placed at the origin, it is found that the force on it is zero. Find out α.
The drum of the photocopying machine in the problem above has a length of 48 cm and a diameter of 9 cm. What is the total charge on the drum
A particular guitar string is supposed to vibrate at 200Hz, but it is measured to actually vibrate at 209Hz. By what percent should the tension in the string be changed to get frequency to the correct value.
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