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Four charges are at the corners of a square, with B and C on opposite corners. Charges A and D, on the other two corners, have equal charge, while both B and C have a charge of +1.0 C. What is the charge on A so that the force on B is zero?
A falling stone takes 0.28 s to travel past a window 2.2 m tall. From what height above the top of the window did stone fall.
Two charged bodies exert an electrostatic force of 144 N on each other. If the distance between them is quadrupled and magnitude of one charge is cut in half, what is the new force between them.
The moon in its orbital about the earth has a centripetal acceleration about 1/4200 of that an object dropped on Earth's surface. If the moon were twice as far away what would its centripetal acceleration be?
Get the expression for how moving clocks run slowly when seen by observers at rest.
The drawing shows an equilateral triangle, each side of that has a length of 2.00 cm. Point charges are fixed to each corner, as shown. The +4.0 C charge experiences a net force due to the charges qA and qB. This net force points vertically downwa..
A basketball player grabbing a rebound jumps 70.80 cm perpendicularly. How much total time (ascent and descent) does the player spend (a) in the top 11.2 cm of this jump and (b) in the bottom 11.20 cm? Do your results describe why such players see..
Three equal point charges, each with charge 1.50, are placed at the vertices of an equilateral triangle whose sides are of length 0.550. What is the electric potential energy of the system? (Take as zero the potential energy of the three charges w..
A plane is headed east with an air speed of 205.0 m/s. The wind blows southeast at 32.0 m/s. Determine the velocity of the plane relative to the earth.
A 43.0-N child is in a swing that is attached to ropes 1.60 m long. Find the gravitational potential energy associated with the child relative to her lowest position at the following times.
Helium (He), a monatomic gas, fills a 0.012 m3 container. The pressure of the gas is 6.90x 10^5 Pa. How long would a 0.25 hp engine have to run (1 hp = 746 W) to produce an amount of energy equal to internal energy of this gas.
Bats are capable of navigating using the earth's field-a plus for an animal that may fly great distances from its roost at night. If, as sleeping during the day, bats are exposed to a field of a equal magnitude but different direction than the earth..
Intuitively, the man will not catch the bus unless he is running fast enough. In mathematical terms, there is a constraint on the man's speed so that the equation above gives a solution for that is a real positive number.
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