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A hydrogen atom, initially at rest, emits an ultraviolet photon with a wavelength of = 121 What is the recoil speed of the atom after emitting the photon?
Bill and Julie are both now on identical trains. Bill's train is moving to the right with velocity (/2)c with respect to Julie's train. How long does Bill measure Julie's train to be
Jill of the Jungle swings on a vine 6.9 m long. What is the tension in the vine if Jill, whose mass is 63 kg, is moving at 2.4 m/s when the vine is vertical
In the lab frame, a point charge of +q is at rest between two streams of positive charge moving at c/3. The charge per unit length in the line of moving charges is ?C/m. In the lab frame, the electrostatic forces on charge q add up to zero, and th..
A bullet hit a block of wood with a mass of 10 kg, traveling horizontally at 300 m/s. What is the recoil velocity of the block
A solid uniform disk of mass M = 9 kg and radius R = 29 cm rests with its flat surface on a frictionless table, What is the total kinetic energy of the disk
A hypodermic syringe has a piston area of 0.5 cm^2 and a needle with circular opening of diameter 0.2 mm. What is the gauge pressure in the syringe while pushing the piston with 1 N of force
Imagine that the only visible photons that an electron in a box of unknown length emits have wavelengths of 689nm and 413nm, Identify the transitions and find the length of the box
A rectangular copper strip 1.5 cm wide, 0.1 cm thick carries a current of 5 A. A 1.2 T magnetic field is applied perpendicularly to the strip. Find the Hall voltage that should be produced
A steel section of the Alaskan pipeline had a length of 65 m and a temperature of 12°C when it was installed. What is its change in length when the temperature drops to a frigid -38°C?
Unpolarized light is shone on a stack of 3 polarizers, What fraction of the initial intensity emerges from the stack
A triangular circuit is formed with a current of 2A running through each wire (3cm>4cm>5cm), find the net force on the circuit
A charge of +2q is fixed to one corner of a square, while a charge of -1q is fixed to the diagonally opposite corner. Expressed in terms of q, what charge should be fixed to the center of square, so the potential is zero at each of the two empty c..
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