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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 convex spherical mirror with a radius of curvature of 11.0 cm produces a virtual image one third the size of the real object. Where is the object
A 3.8 kg ball is at rest on the floor in a 1.2 m ? 1.2 m ? 1.2 m room of air at STP. Air is 80% nitrogen (N2) and 20% oxygen (O2) by volume. What is the thermal energy of the air in the room
you want to lift a 500-lb object with a lever. you can place a falcrum under a long board a distance of 1.5 ft from the object. how long is the board (total length) needed to lift the object
What centripetal force will the ride exert. How far should the stone fall so that the pulley has 6.50 J of kinetic energy.
A lonely party balloon with a volume of 2.40 L and containing 0.100 mol of air is left behind to drift in the temporarily uninhabited, Calculate the entropy change of the air during the expansion
If you were to build a pipe organ with open-tube pipes spanning the range of human hearing (20 Hz to 20 kHz), what would be the range of the lengths of pipes required
A railroad freight car weighing 289 kN and traveling at 1.52 m/s overtakes one weighing 207 kN and traveling at 0.910 m/s in the same direction. Find the loss of kinetic energy during collision
A 0.030 kg lead bullet hits a steel plate, both initially at 20?C. The bullet melts and splatters on impact. How much heat is required to increase the temperature of the lead bullet and melt it
A solenoid has a diameter d = 1.5 cm, length l = 30.0 cm, and 440 turns. What is the magnetic flux through each turn of the solenoid
A 6.2-m radius playground merry-go-round with a moment of inertia of 2400 kg·m2 is rotating freely with an angular speed of 1.5 rad/s. What is the angular speed of the merry-go-round right after the two people have stepped on
Two charges are fired directly at each other. Both charges have different masses and different initial velocities so that the initial momentum of the system is not necessarily zero. Assume that the net momentum of the system is \(\overrightarrow{{..
The speed of the fastest-pitched baseball was 45.0 m/s , and the ball's mass was 145g. How many joules of kinetic energy did this ball have
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