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A charge Q = -820 nC is uniformly distributed on a ring of 2.4 m radius. A point charge q = +530 nC is fixed at the center of the ring. Points A and B are located on the axis of the ring, as shown in the figure. What is the minimum work that an external force must do to transport an electron from B to A?
Two sound waves have equal displacement amplitudes, but one has 2.1 times the frequency of the other. What is the ratio of their intensities?
A 3.0m length of straight wire carries a current of 18A in a uniform magnetic field of 70mT whose direction is at an angle of 36o from the direction of the current.
A 3.7-kg block of iron (c=0.11 kcal/kgoC) that has been brought to a temperature of 1,062oC is placed on top of a 2.5-kg block of ice (c=0.5 kcal/kgoC) that has been cooled to -50oC. what is the final temperature of the iron block
A certain thin, uniform rod has a mass of 2 kg and length 3 m. To what shorter length must you trim it (discarding the smaller part) so that the remaining length has half the original moment of inertia about its end.
the record of 203.1 km/h for speed skiing set by franz weber at velocity peak in colorado was achieved in a mountain slope inclined downward at 51 degrees. what is the rate at which gravity does work on the skier
Calculate the electrical potential at the center of the square described as follows: Four charges are placed at the corners of a 20 cm square
Blood flows through a vein at a rate of 3.5 mL/s. Among other things, it contains a protein with a molecular weight of 63,000, at a concentration of 2.9 g per 150 mL. How many grams of this protein are carried by the blood each second?
A converging lens (f = 12.4 cm) is located 31.8 cm to the left of a diverging lens (f = -5.4 cm). Find the overall magnification
One mole of gas obeys van der waal's equation of state and allowed to expand isothermally from v1 to v2. Derive equation for the change in Gibbs free energy for such expansion.
water in a rotating container of radius 50 mm is 30 mm lower in the center than it is on the edge. Find the angular velocity of the container
Find the resultant force of a tank that is entirely filled with an incompressible fluid and has a piston at end. Side going into take F=100N
A turntable has a moment of inertia of 0.030 kg-m2 and spins freely on a frictionless bearing at 25 rev/min. Find the new rate of rotation of the system
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