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An astronomical telescope has an angular magnification of -131. Its objective has a refractive power of 1.75 diopters. Evaluate the refractive power of its eyepiece?
A system consisting entirely of electrons and protons has a net charge of 1.83 10-15 C and a net mass of 4.61 10-23 kg. How many electrons are in this system
A 3.0 meter long ladder leans against a frictionless wall. The coefficient of static friction between the floor and the ladder is 0.40. Find the minimum angle the ladder can make with the floor without it slipping
An electron with a speed of 7.00 108 cm/s enters an electric field of magnitude 1.00 103 N/C, traveling along the field in the direction that retards its motion. (a) How far will the electron travel in the field before stopping momentarily?
find the magnitude of the electric field at a point midway between two charges 24.3 times 10-9 c and 75.5 times 10-9 c
A 20.00kg sled is being pulled across a horzontal surface at a constant velocity. Determine the kinetic frictional force
Suppose 0.0330 kg of steam (at 100.00°C) is added to 0.330 kg of water (initially at 21.1°C.). Find the final temperature (in °C) of the water after equilibrium is reached
A cable supports a uniformly distributed load. The max tension that the cable can withstand is 41 x 10^6 N. What min length of cable is needed
A person who weighs 684 N steps onto a spring scale in bathroom, and the spring compresses by 0.518 cm. (a) What is the spring constant? (b) What is the weight of another person who compresses spring by 0.328 cm.
A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 40-kg child sits on the other end. How long is the beam
1 you chose a an arbitary point to begin measuring the postion of the falling object. how fast was it going at the
The loaded cab of an elevator has a mass of 2.8 x 10^3 kg and moves 214 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab.
An eagle with a wing span of 2.0m flies due north at 8.0m/s in a region where the vertical component of the earth’s magnetic field is 0.2x10-4 T. What emf would be developed among the eagles wing tips?
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