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By what factor does the resistance of a copper wire change if its length doubles and its diameter triples? (If the resistance doubles, enter "2"; if it decreases by a factor of three, enter "1/3", etc.)
two balls A and B are thrown from the top of a vertical cliff. Ball A is thrown horizontally reaching the ground in 3.5 s. what is the height of the cliff
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.60×106N, What is the total work done by the two tugboats on the supertanker
You would like to produce an electric field of 640 N?C in theregion between two parallel plates that are separated by a distanceof 0.16m. What voltage should you connect across the plates?
a police car is traveling east at 39.5 ms along a straight road overtaking a car ahead of it moving east at 31.5 ms.
two masses m1 and m2 move in a plane and interact by potential energy U(r)=1/2kr^2. write down their Lagrangian in terms of the CM and relative position R and r, and find the equations of motion for the coordinates X,Y,x,y. Describe the motion and fi..
A thin bi-convex lens with index of refraction n=1.5has radii of curvature for its left and right surfaces of magnitude15 cm and 30cm respectively. Is the image upright or inverted
A 2kg cube of Aluminum is suspended by a rope tied to aballoon which is floating on a fluid of density 1.5x103kg/m3. What volume of the ballon is submerged in the liquid
A rectangular block of copper has sides of length 5 cm, 21 cm, and 38 cm. what are the currents that the block can carry
Determine the magnitude of the force on an electron traveling 7.85×105m/s horizontally to the east in a vertically upward magnetic field of strength 0.44T
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 hydraulic cylinder with a radius of 0.0281 m has a piston on the left end and a safety valve at the right end. The safety valve is a circular opening with a radius of 0.00650m, sealed with a disk. The disk is held in place by a spring (spring co..
A block of mass m = 5.0 kg is pulled along a rough horizontal surface by a rope as sketched in the figure below. The tension in the rope is 80 N, Find the work done by friction on the block
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