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Suppose that an electron is trapped within a small region and the uncertainty in its position is 7.20 multiply.gif 10-15 m (about the size of the nucleus of an medium sized atom). What is the minimum uncertainty in the electron's momentum?
kg · m/s
A 5.00--long ladder has mass 12.5 kg and is leaning against a frictionless wall, making a 64 degree angle with the horizontal. If the coefficient of friction between the ladder and ground is 0.42, what is the mass of the heaviest person who can safel..
A power line, running above the ground at the top of 8.0 m high poles, carries a current of 90 A. What is the magnitude of the magnetic field produced by this wire at the ground
A 54-kg skater initially at rest throws a 3.0-kg medicine ball horizontally to the left. Determine the acceleration of the ball during the throw
A dock worker applies a stable horizontal force of 79.0 {rm N} to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves 14.0 {rm m} in the first 6.00 {rm s}.What is the mass of the bl..
Its walls are equally high and 11 m apart. He takes off by driving a motorcycle up a short ramp sloped at an angle of 24°. Illustrate what minimum speed must he have in order to clear the canyon?
A 130- baseball, moving along the axis with speed 35 , strikes a fence at a 45 angle and rebounds along axis with unchanged speed Give the - and - components of its change in momentum.
A copper wire has a 25 m-ohmic resistance at 20 degrees C. When the wire is carrying a current, What is the change in the wire's resistance
A 4.6-{\rm Hz} wave with an amplitude of 20cm and a wavelength of 30cm travels along a stretched horizontal string. How far does a given peak on the wave travel in a time interval of 0.55s ? The answer is dpeak = .76m. How would your answer to par..
An air conditioner is used to keep the interior of a house at a temperature of 25C while the outside temperature is 34C a)If heat leaks into the house at the rate of 11kW, and the air conditioner has the efficiency of a Carnot engine, what is the ..
Angel Falls in southeastern Venezuela is the highest uninterrupted waterfall in the world, dropping 979 m (3212 ft). Assume that it takes 14 s for the water to fall from the lip of the falls to the river below. If the water lands 55 m from the bas..
A student eats a candy bar that may give 1.8 * 10^6 joules of energy. if the student has a mass of 60 kg, how high will he have a climb a ladder to offset completely the energy contained in the candy bar.
A sphere with mass 0.3 kg and radius 0.05 cm is rolling without slipping along a horizontal surface at a speed of 10 m/s. What height does the sphere come to rest
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