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Starting from rest, a 2.4x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.42 N on it. This force does 1.5x10-4 J of work on the flea.
(a) What is the flea's speed when it leaves the ground?
(b) How far upward does the flea move while it is pushing off?
Ignore both air resistance and the flea's weight.
A light bulb has a resistance of 275 ohm when operating with a potential difference of 230 V across it. What is the current in the light bulb
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A speedboat starts from rest and accelerates at +2.01 m/s2 for 7.25 s. At the end of this time, Find the total displacement of the boat
Suppose all batteries are ideal unless told otherwise. Given three batteries with voltages of 1.0 V, 4.0 V and 8.0 V. What are the minimum and maximum voltages that could be achieved by connecting them in series?
A ball is tossed vertically upward with an initial speed of 26.4m/s. How long does it take before the ball is back on the ground
A circular coil consists of 60 turns of wire wound around the rim of a plywood disk of radius .15 m. what is the magetic field produced at the center of this disk
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An old campfire is uncovered during an archaeological dig. Its charcoal is found to contain less than 1/950 the normal amount of 14C. Obtain the minimum age of the charcoal
1. a street light is supported by two wires and each makes a different angle from each other. the one on the left
A slinky has a mass of 0.28 kg and negligible length. When it is stretched 1.2 m, it is found that transverse waves travel the length of the slinky in 0.68 s. What is the force constant, k, of the slinky
q1 = -2 ?C is at (-5cm, 3cm) and q2 = +8?C is at (0,0). Find the x component of the electric force exerted on q2 due to q1
A copper wire 40 cm long carries a current of 6.0 A and weighs 0.35 N. A certain magnetic field is strong enough to balance the force of gravity on the wire. What is the strength of the magnetic field?
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