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A child finds a uniform metal rod of mass M and length L and then balances it against a wall at a very small angle θ with respect to the horizontal. The child is surprised to find that it stays put. The static friction between wall and rod-end is the same in magnitude as the force of static friction between floor and rod-end. What normal force does the wall exert on the rod?
Consider the reaction 4He + 40Ca -> 3H + 21Sc Find the minimum laboratory kinetic energy for the 4He projectile if 40Ca is stationary
An 18 kg sled starts up a 31 degree incline with a speed of 3.2 m/s. The coefficient of friction is 0.25. How far up the incline does the sled travel
The motion of the Andromeda galaxy relative to the Milky Way can be determined by measuring the wavelength of known spectral absorption lines. Find the wavelength of a line that would be observed in a spectrum from Andromeda if the same line had a..
A block of wood is placed on a frictionless horizontal surface and a 7.00 g bullet is fired from a gun into the 1.00-kg block of wood and remains embedded. find the average force exerted by the block on the bullet
Two charged objects experience a mutual repulsive force of 0.71 N. If the charge of one of the objects is reduced by half and the distance separating the objects is quadrupled, what is the new force? (Enter the magnitude of the force.)
a person sees clearly wearing eyeglasses that have a power of -5.00 diopters when the lenses are 1.65 cm in front of
Two identical 0.11 kg blocks (labeled 1 and 2) are initially at rest on a nearly frictionless surface, connected by an unstretched spring, how far did the center of mass of the real system move
A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 62.12 diopters, How far is the blackboard from her eyes
A photon has an energy E and wavelength lambda before scattering from a free electron. find the initial wavelength and energy of the photon
How many revolutions per minute would a 29 {rm m}-diameter Ferris wheel require to make for the passengers to feel "weightless" at topmost point.
Two charges, one is + 21 nC and other is -2 x 21 nC are separated by 1 meter distance. Find the electric field at the midpoint of the line joining the charges
The horsepower rating commonly utilized for engines indicates the rate at which they can do work. A one-horsepower engine can do 746 J of work each second. A lawn mower has a 6.50 horsepower engine that runs at 3800 rpm.
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