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Two small plastic spheres are given positive electrical charges. When they are 15.0 cm apart, the repulsive force between them has magnitude 0.220 N. What is the charge on each sphere?
(a) If the two charges are equal and
(b) If one sphere has four times the charge of the other?
A solenoid 26 cm long has 2800 turns of wire and carries a current of 5.9 A. Find the magnetic field at the common center
Consider an idealgas at 27 degrees C and1.00 atm pressure. Imaginethe molecules to be, on average, uniformly spaced, What is the length of an edge of each small cube
A gun is fired 20 degrees to the horizontal at the edge of a cliff 300m above a flat plane where its target is located. how long is the shell in the air
A 40 g rifle bullet travelling 260 m/s buries itself in a 4.0 kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Find out the vertical and horizontal components of pendulum's displacement.
A 4 kg block is acted upon by three horizontal forces. 10n (to left) 5n(short arrow to right) 25n to right. what is the net horizontal force acting on the block? what is the horizontal acceleration of the block?
In western movies, the hero sometimes detects an approaching trainby "listening" to the railroad tracks. If the tracks are made ofsteel, how many times faster does sound travel in the tracks thanin air?
A 38.8-kg boy, riding a 2.27-kg skateboard at a velocity of +5.22 m/s across a level sidewalk, jumps forward to leap over a wall. What is the skateboard's velocity relative to the sidewalk
The ratio of the number of turns in the primary to the number of turns in the secondary of a step-down transformer is 25:1. how much power is delivered to the secondary
Kevin has a mass of 81.2-kg and is skating with in-line skates. He sees his 15.4-kg younger brother up ahead standing on the sidewalk, find Kevin's speed just before he grabbed his brother
an experiment youre designing needs a gas with ? 1.45. you recall from your physics class that no individual gas has
A 1kg ball with a speed of 3 m/s collides head on, elastically, with a 2 kg ball moving at 1 m/s. What will be the velocity of each ball after the collision
A 63.5-kg runner has a speed of 5.80 m/s at one instant during a long-distance event. If he doubles his speed to reach the finish line, by what factor does his kinetic energy change
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