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A battery with emf E = 15 V and internal resistance r = 0.60 Ω is used to power a motor. The motor lifts a weight w = 10 N. What is the maximum speed that the motor can lift the weight.
If one vibration has 4.8 times the energy of a second, but their frequencies and masses are the same, what is the ratio of their amplitudes
The ball is free from rest with the line taut and horizontal (θ = 90.0°). At what angle θ (measured from the vertical) would the fishline break.
A child's top is held in place, upright on a frictionless surface. The axle has a radius of r= 2.21 mm. Two strings are wrapped around the axle, How much angular momentum does the top acquire
The telescope at Yerkes Observatory in Wisconsin has an objective whose focal length is 19.4 m. Its eyepiece has a focal length of 10.0 cm. What is the angular magnification of the telescope
A student presses a book between his hands, as the drawing indicates. What is the magnitude of the minimum pressing force
a 90 ohm resistor has a current of .6A and is connect in series with a 150 ohm resistor. What is the emf of the battery to which the resistors are connected
A 10g bullet is fired horizontally into a 300g wooden block initially at rest on a horizontal surface and becomes embedded in it. The coefficient of friction between block and surface in 0.50. The combined system slides 4.0m before stopping. With ..
An alpha particle (helium nucleus) has total energy 4.1 GeV. Obtain the speed of an electron with same total energy
The heaviest and lightest strings on a certain violin have linear densities of 3.7 and 0.28 g/m. What is the ratio of the diameter of the heaviest string to that of the lightest string, assuming that the strings are of the same material?
A track has a height that is a function of horizontal position x, given by h(x) = x^3 + 2x^2 ? 14x + 16. What kind of equilibrium exists at each of these positions
A particle with positive charge q = 3.20e10-18 C moves with a velocity = (4i+ 4j -k ) m/s through a region where both a uniform magnetic field and a uniform electric field exist. Calculate the total force on the moving particle
The average speed of a nitrogen molecule in air is about 6.70 e2m/s, and its mass is about 4.68e-26 kilogram. Find what average force does the molecule exert on the wall
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