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It is found experimentally that the electric field in a certain region of Earth's atmosphere is directed vertically down. At an altitude of 300 m the field has magnitude 60.0 N/C; at an altitude of 200 m, the magnitude is 100 N/C. Find the net amount of charge contained in a cube 100 m on edge, with horizontal faces at altitudes of 200 and 300 m.
A runner whose mass is 55 kg accelerates from a stop to a speed of 8 m/s in 3 seconds. How much work is done on the point-particle system by this force
A cannon fires a cannon ball at 769.26 m/s in a straight line that passes directly over an observer's head. how far is the cannon from the observer
Typically, a tennis ball hit during a serve travels away at about 47 m/s. what is the magnitude of the change in its momentum
You put a mass on the end of a light string so that it forms a simple pendulum that swings back and forth with a period T. If you double the mass on the end of the string, the period of the pendulum will... A mass is oscillating up and down on the ..
A rattlesnake can strike with the acceleration equivalent to an increase in speed from 0 to 60 mi/h in 1/2 s. If the rattlesnake's head weighs 0.33 lb, what average power does the rattlesnake generate throughout its strike.
A man pulls a block of mass m = 23 kg up an incline at a slow constant velocity for a distance of d = 5.5 m. The incline makes an angle q = 29° with the horizontal. The coefficient of kinetic friction between the block and the inclined plane is µk..
A bucket of water with a mass of 2.0 kg is attached to a rope that is wound around a cylinder. What is the acceleration of the bucket
Minh pulls a 10-kg crate on a rough inclined ramp with a cable tension F, directed towards the top and parallel to the plane. The angle of inclination of the plane is 30 and the coefficients of static and kinetic friction between the block and the in..
A hydraulic lift is used to jack a 970 kg car 12 cm off the floor. The diameter of the output piston is 18 cm, and the input force is 250 N. What is the area of the input piston
Two identical objects each hold a net charge of q = 9e. If the gravitational force between the two objects exactly cancels the electrostatic force between the objects, what is the mass of each object
A series RLC circuit has R = 50 %uF057, L = 2.7 %uF06DH, and C = 52 nF. What is the average power dissipated by the circuit
A football is kicked from the ground with a velocity of 38 m/s at an angle of 40 degrees and eventually lands at the same height. How far away does the ball land
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