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If a visible photon by wavelength 434 nm is emitted from an atom in a hydrogen gas lamp, what energy state was the atom in before the photon was emitted? That is, what was the number for that state?
suppose that the gold ions carry one elementary unit of positive charge.
Calculate the maximum torque that can be applied to the pedals of a bicycle by a rider with a body mass of 74.0 kg, if the pedalarm is 20.0 cm long.
A 400 g lemming (does anyone remember that old computer game?) waddles horizontally off a small 4.90 m high cliff with a speed of 0.5 ms-1.How far from the base of the cliff will the lemming land? What will be the lemmings speed upon landing.
to ensure a tight fit cylindrical metal elements are sometimes made the same size or even slightly larger than the
A fish takes the bait and pulls on the line with a force of 2.3N . The fishing reel, which rotates without friction, is a uniform cylinder of radius 0.060m and mass 0.86kg, What is the angular acceleration of the fishing reel
In an EM wave traveling west, the B field oscillates vertically and has a frequency of 80.0 kHz, What are the frequency and rms strength of the electric field
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, How long will the mortar shell remain in the air
A ball is being shot from a cannon that is on the ground. the basket is 100m away and is 10m off the ground. How long did this motion take
A block of weight wt1 = 409 N sits on a frictionless table of mass 118 kg. The block is connected via frictionless pulley to a hanging block with weight wt2 = 172 N. FIND the tension in the rope connecting the two masses
The total electric flux coming out of a cubical box, that is 28.0 cm on a side, is 94 GNm^2/C, How many coulombs of charge are enclosed by the box
A glass is half-full of water, by a layer of vegetable oil (n = 1.47) floating on top. A ray of light travelling downward during the oil is incident on the water at an angle of58.0°. Decide the critical angle for the oil-water interface
What is the greatest possible distance from the wall
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