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A uniform magnetic field points north; its magnitude is 4.5 T. A proton with kinetic energy 7.1 10-13 J is moving vertically downward in this field. What is the magnetic force acting on it?
magnitude N
direction
A skier who starts from rest reached a speed of 8.0m/s while goind down a ski slope for 5.0s. how far does the skier travel in this time
To make a simple microscope a student places two converging lenses of +20 D at opposite ends of a 34 cm long tube. How far should an object be placed from the objective lens
A 38.0 kg child swings in a swing supported by two chains, each 3.04m long. The tension in each chain at the lowest point is 429N. Find out the child's speeds at the lowest point.
suppose that two objects attract each other with a gravitational force of 16 units. what would be the new force of attraction between the two objects
An aircraft with a mass of 956 kg accelerates from 0 to 92 m/s in 6.7 seconds, What is the kinetic energy of the aircraft when the aircraft launches
A top loading washing machine has a spin cycle that rorates at frequency f. The spinning drum that holds the clothes has a radius R, Find an expression for the magnitude of the wall's normal force acting on the piece of clothing as the drum spins
Gas lanterns used on camping trips have mantles (small lacy bags that give off light) made from a rayon mesh impregnated with thorium and other materials. A typical mantle contains 439 mg of thorium. What is the reactivity of the mantle
A rod is initially at a uniform temperature of 0 o C throughout. One end is kept at 0oC , and the other is brought into contact with a steam bath at 100 o C.
a 30 year old women takes a trip on a rockect leaving her 30 year old brother behind. She travels at a speed of .8c and is gone for 20 years, how many years older/younger is she than her brother
drop a rock into a well. You hear the splash 2.40 s after you release the rock from rest. How far below the top of the well is the surface of the water
An iron heating coil for a burner on an electric range runs off a 240V circuit and produces 100 Watts of heat. Given a length of 1.2 m for the coil, find the diameter of the coil
The time constant of an RL circuit with L = 25 mH is five times the time constant of an RC circuit with C = 40 µF. What is the time constant of the RL circuit
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