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X rays with a wavelength of 0.14 nm undergo first-order diffraction from a crystal at a 70^\circ angle of incidence.
What is the angle of second-order diffraction?
What is the density of Kripton gas at standard temperature and pressure? The atomic mass of Kripton is 83.80 atomic mass unit
two 1.3kg masses are 1.2m apart (center to center) on a frictionless table. Each has + 9.2?Cof charge, What is the magnitude of the electric force on one of the masses
How much work must be completed to accelerate a baton from rest to an angular speed of 7.79 rad/s about its center? Consider the baton to be a uniform rod of length 0.596m and mass 0.495kg.
A spring has an unstretched length of 12cm. When an 80 g ball is hung from it, the length increases by 4.0 cm. What is the period of the oscillation
A compressed air cylinder stands at 93.0 cm tall and has internal diameter 20.7cm. At room temperature, its pressure is 172 atm. how many moles of air are in the cylinder
a 20 kg mass sits on an inclined plane with friction making an angle of 50 degrees with respect to the horizontal. calculate the frictional force required to keep the mass from sliding down the incline
A piece of copper wire joins a piece of aluminum wire whose diameter is twice that of the copper. The same current flows in both wires, Compare the drift speeds in each
Is the momentum change identical? If not, the ball would have the larger momentum change throughout the collision with the wall?
A daring ranch hand sitting on a tree limb wishes to drop vertically onto a horse galloping under the tree. How long (s) is he in the air
If the current in the circuit is 0.15 A and the resistances are R1 = 100 ? and R2 = 260 ?, what is the emf of the battery.
What is the initial (horizontal) velocity of the ball. An airplane needs to reach a velocity of 203 km/h to take off. On a 2000 m runway, what is the least acceleration necessary for the plane to take flight.
A 215.0 g piece of lead is heated to 89.0oC and then dropped into a calorimeter containing 500.0 g of water that initally is at 21.0oC. compute the final equilibrium temperature of lead and water
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