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Two metal spheres, each of mass 20 g and initially at rest, are dropped from a height of 10 m in an evacuated chamber. One sphere has a charge of +90 ?C, and the other has a charge -90 ?C. Find the difference in final speeds of the two spheres (the speeds just before each one hits the ground). Assume that there is a downward electric field of about 150 V/m near the Earth's surface.
In a series R-L-C circuit, the phase angle is 40.5?, with the source voltage leading the current, Find the reactance of the inductor
Two astronauts, each having a mass of 79.0 kg, are connected by a 10.5 m rope of negligible mass. Calculate the rotational energy of the system
Neglect air resistance, as well as any energy absorbed by the pole, and clerify her altitude as she crosses the bar.
A girl is standing at the edge of the cliff 271 m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed of 6.17 m/s. a) how long does it take the rock to hit ground? b) What is the speed of the ro..
One particle has a mass of 3.00 10-3 kg and a charge of +8.40 µC. A second particle has a mass of 6.00 10-3 kg and the same charge. Find the initial separation between the particles
You are given a force versus distance graph and the initial velocity at the origin. How do you calculate velocity at any point in time on the graph
Capacitors won't hold a charge indefinitely; as time goes on, charge gradually migrates from the positive to the negative plate. What is the Leakage resistance
A professor's office door is 0.94 wide, 2.2 high, 4.0 thick; has the mass of 23, and pivots on frictionless hinges. A "door closer" is attached to door and top of the door frame. When the door is open and at rest, the door closer exerts a torque of 5..
A stone is thrown into the air with an initial velocity of 50 m/s at 37degress to the horizontal, find the total horizontal distance it travels
An iron bar 40 cm long is braised to a copper bar 50 cm long and of the same diameter. What is the heat flow down the rod if its cross-sectional area is 2.50 cm2
The potential in a region between x = 0 and x = 6.00 m has a linear relation, Calculate the potential at the following positions: x = 0, 3.00 m and 6.00 m and also find magnitude and direction
A sailboat is traveling east at 5.0 m/s . A sudden gust of wind gives the boat an acceleration a = (0.80 m/s^2 , 40 degrees north of east). A)What is the boat's speed 4.5s later when the gust subsides? B)What is the boat's direction 4.5s later whe..
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