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A contact lens is made of plastic by an index of refraction of 1.48. The lens has an outer radius of curvature of +1.90 cm and an inner radius of curvature of+2.59 cm. What is the focal length of the lens?
Three blocks (1,2,3) of mass 3.00 kg, 2.00 kg, 1.00 kg sit linearly 10.0 cm apart from each other on a frictionless surface. What percent of the initial energy of the bullet was lost
An airplane has a mass of 1.8×10^6 kg , and the air flows past the lower surface of the wings at 94 m/s .f the wings have a surface area of 1300 m^2, how fast should the air flow over the upper surface of the wing if the plane is to stay in the ai..
An electric heater is rated at 1300 W, a toaster is rated at 1150W, and an electric grill is rated at 1530 W. The three appliancesare connected in parallel to a common 123 V circuit.
A step-up transformer has 24 turns on the primary coil and 780 turns on the secondary coil. what input current and voltage are needed
The isotope 210Po eventually decays after two transitions to stable 206Pb. Polonium was the isotope that was used to kill the former Russian KGB agent Alexander Litvinenko in November of 2006.
A 60 kg man is riding on a 30 kg cart traveling at a speed of 2.7 m/s. He jumps off with zero horizontal speed relative to the ground. What is the resulting change in the cart's speed
A charge of -4.04 μC is fixed in place. From a horizontaldistance of 0.0462 m, a particle of mass 8.45 x10-3 kg and charge -8.38 μC is fired with aninitial speed of 86.0 m/s directly toward the fixed charge. What is the distance of closest approach..
if the radius of the equipotential surface of a point charge is 23.0m and is at a potential of 1.30kv compared to zero
A ladder 2.05 m long, weighing 229 N, initially lies flat on the ground. The ladder is raised to a vertical position. Compute the work done by the force lifting the ladder
An ion harvester is scouring deep space for isolated xenon (Xe+) ions. A xenon ion is singly ionized and has the charge of +e. If the field meter reads 0.000000202 N/C, how far away is it from the ion.
a wire with a circular cross section and a resistance r is lengthened to 8.86 times its original length by pulling it
A thin film of alcohol (n = 1.36) lies on a flat glass plate (n =1.51). What is the thickness of the film
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