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A rectangular block of metal of resistivity rho has dimensions dx2dx3d. A potential difference V is to be applied between two opposite faces of the block. What is the maximum current in terms of V, rho, and d?
A 76kg student consumes 2500 Cal each day and stays the same weight. One day, he eats 3500 Cal and, wanting to keep from gaining weight, decides to "work off" the excess by jumping up and down.
A student sits on a freely rotating stool holding two dumbels, each of mass of 3.00kg. find the kinetic energy rotating system before and after he pulls the dumbbells inward
If 7.50 kg of ice at -5.00°C is added to 12.0 kg of water at 15°C, compute the final temperature. T = 0 C, How much ice remains, if any
A scaffold that weighs 400 N supports two painters, one 500 N and the other 400 N. The reading in the left scale is 800 N. What is the reading in the right hand scale
A standing wave is established in a 89 cm long string fixed at both ends. The string vibrates in 6 segments when driven at 376 Hz. What is the fundamental frequency?
Three charges are positioned on a line. Q1= -2uC, Q2= +5uC, Q3= +3uC. The distance between Q1 and Q2 is a=0.25m. Find the direction of the electric force acting on the charge
Suppose that a 1800 kg car passes over a bump in a roadway that follows the arc of a circle of radius 20.8 m, What force does the road exert on the car as the car passes the highest point of the bump if the car travels at 40.0 km/h
A 1500kg car moving at 40Km/hr is brought to a sudden stop. If all the car's kinetic energy is dissipated in heating its four 5.0kg steel brake disks, by how much do the disk temperatures increase? The specific heat of steel is c=0.120cal/gdegree Cel..
The pressure exerted by a phonograph needle on a record is surprisingly large. what pressure is exerted on the record in N/m2
The mass of a robot is 5220 kg. This robot weighs 2650 N more on planet A than it does on planet B. Both planets have the same radius of 2.26 × 107 m
A shopper in a supermarket pushes a cart with a force of 37.5 N directed at an angle of 17.0° downward from the horizontal. Find the work done by the shopper on the cart as he moves down an aisle 45.0 m long
A 1200-turn coil of wire that is 2.1 cm in diameter is in a magnetic field that drops from 0.14 T to 0 T in 12 ms. What is the emf of the coil
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