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An electron decays from the n = 4 orbit to the n = 1 orbit in the hydrogen atom. If the work function of aluminum is 4.3 eV, does the ensuing photon have enough energy to knock an electron out of aluminum? If so what is the wavelength of the electron that comes out of the aluminum?
An astronaut who is repairing the outside of her spaceship accidentally pushes away a 96.7-cm-long steel rod, What is the magnitude of the EMF, in millivolts, induced between the ends of the rod
A mortar crew is positioned near the top of a steep hill. Enemy forces are charging up the hill and it is necessary for the crew to spring into action. find How long will the mortar shell remain in the air
A vertical wall (7.2 m 2.8 m) in a house faces due east. A uniform electric field has a magnitude of 150 N/C. What is the electric flux through the wall
A 102g Frisbee is 25cm in diameter and has half its mass spread uniformly in the disk and the other half concentrated in the rim. What is the Frisbee's rotational inertia
a box of mass m1kg slides 20sqrt2m down an incline plane of angle pi4 and kinetic friction is 12.what are the
In an adiabatic centrifugal compressor atmospheric air at 15 degree Celsius is compared to 600kPa pressure. Find the specific compression work and the efficiency of the compressor
an ideal gas initially at 20c and atmospheric pressure is placed in a solid cylinder with height 100cm and radius 5cm
q1. a car at the indianapolis-500 accelerates uniformly from the pit area going from rest to 325 kmh in a semicircular
a particle has a velocity u 0.84c in the labortory. the laboratory is itself moving with velocity v 0.77c relative to
Two thin rods of length L lie along the x-axis, one between x=a/2 and x=a/2+L and the other between x= - a/2 and x= - a/2 - L. Each rod has positive charge Q distributed uniformly along its length.
Two boats are initially separated by distance d and head directly toward one another. The skippers of the boats want to arrive at the same time at the point that is halfway between their starting points.
A rock is thrown vertically upward with a speed of 19.0m/s from the roof of a building that is 70.0m above the ground. Assume free fall. What is the speed of the rock just before it strikes the ground?
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