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Q. A convex spherical mirror with a radius of curvature of 14.5 cm produces a virtual image one half the size of the real object. Where is the object?
Q. A man and a boy carry a canoe 5.90 m long and weighing 379 N. The canoe is held overhead in a horizontal position. The boy holds one end of the canoe. How far from the opposite end should the man stand so that the boy exerts a force of only 124 N?
A uniform electric field with a magnitude of 250N/C is directed in the positive x direction. A 12uC charge moves from the origin to the point (20.0 cm, 50.0 cm). what is the change in electrical potential energy of the system as a result of the ch..
A 3.10-m-long, 310 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 73.0 kg construction worker stands at the far end of the beam. What is the magnitude of torque abou..
Two diffraction patterns are formed on the screen. What is the distance between the common center of the diffraction patterns and the first occurrence of the spot where the dark fringe from one pattern falls on top of a dark fringe from the other p..
A playground merry go round of a diameter 6m and mass 240 kg is rotating at 12 rev/min about a frctionless vertical axle. Facing the axle, a 30kg child hops on to the merry go round and manages to sit down on its ledge. What is the new angular spe..
A bullet is fired horizontally from a 100 m, t all building with a speed of 900 m? How long will it take to hit the ground?
A 36.0 kg uniform beam is attached to a wall with the hinge while its far end is supported by a cable such that the beam is horizontal.
A stone of mass 0.31 kg is tied to a string of length 0.85 m and is swung in the horizontal circle with speed v. The string has a breaking-point force of 90 N. What is the largest value v can have without string breaking.
A bar AB of negligible mass and length 2 m balanced at its midpoint a 4 kg and 5 kg masses are suspended from both ends. A 4 kg mass is 0.4m away from the midpoint. At what point the mass of 5 kg is suspended to a bar keep the balance.
As an energy-efficiency consultant, you're asked to assess the pumped-storage facility. Its reservoir sits 136 above its generating station and holds 9.0×10^9 of water. The power plant generates 315 of electric power while draining the reservoir over..
Liquid nitrogen has a boiling point of 77.3 K and a latent heat of vaporization of 2.01 105 J/kg. A 60.0-W electric heating element is immersed in an insulated vessel containing 46.5 L of liquid nitrogen at its boiling point. How various kilograms of..
A dockworker applies a constant horizontal force of 79.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 15m in a time 4.50s. What is the mass.
You hold a spherical salad bowl 90 cm in front of your face with the bottom of the bowl facing you. The salad bowl is made of polished metal with a 35 cm radius of curvature. What is the image (your face's image) distance along the central axis fr..
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