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Jill, who has a mass of 52 kg, is having a tug-of-war with Brian, who has a mass of 114 kg. Brian, being much stronger than Jill, easily pulls Jill towards him with an acceleration of 9.7 m/s2 by exerting a force of 460 N on the rope. How hard is Jill pulling on the rope?
The corroded contacts in a light bulb socket have 8.5? ohms total resistance. Find how much actual power is dissipated by a 110 Watt (120 V) light bulb screwed into this socket
What is the magnitude of buoyancy force ?
A box slides down a plane inclined at 24 relative to the horizontal, with coefficient of kinetic friction equal to 0.09. Calculate the acceleration of the box
Using Faraday's Law, derive the self-inductance per unit length of a long (ideal) solenoid with n turns per unit length, and of radius R. How much energy is stored in this solenoid
A cyclotron with a magnetic field B=0.9 T and a maximum orbital radius of 50 centimeter is used to accelerate deuterons (2Hnuclei). Find the frequency of the AC accelerating voltage
A 4.1-kg block slides down an inclined plane that makes an angle of 29° with the horizontal. Find the coefficient of kinetic friction between the block and plane
One kilogram of dry air is warmed from 20ºC to 70ºC under a constant pressure of 1atm. Calculate the change in internal energy
An electron enters a region of space containing a uniform 0.0000179-T magnetic field. Its speed is 151 m/s, Find the radius r of the electron\'s path
A hollow, conducting sphere with an outer radius of 0.243 m and an inner radius of 0.203 m has a uniform surface charge density of +6.45*10^(-6) C/m^2. What is the new charge density on the outside of the sphere
A 200g ball on a 70-cm-long string is swung in a vertical circle about a point 200 cm above the floor. What was the tension in the string an instant before it broke
A construction worker drags a box across the floor. If the frictional force between the floor and the box is 12.2 Newtons, how much work does friction do as the box moves 11.5 meters
A generator is designed to produce a maximum emf of140 V while rotating with an angularspeed of 3600 rpm. how many turns of wire are needed
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