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An unidentified flying object (UFO) flashes across the night sky. A UFO enthusiast on the top of Pike's Peak determines that the length of the UFO is 121 m along the direction of motion. If the UFO ismoving with a speed of 0.534c, how long is the UFO according to its pilot?
The temperature of the surface of a certain star is 7500 K. Most hydrogen atoms at surface of the star are in the electronic ground state. What is the approximate fraction of hydrogen atoms that are in the first excited state (and therefore could ..
A 27 pound meteorite struck a car, leaving a dent 26cm deep in the trunk. If the meteorite struck the car with a speed of 620m/s, what was the magnitude of its deceleration, assuming it to be constant.
A coil has an inductance of 0.45 H and a resistance of 42 ohms. The coil is connected to a 5.6 V ideal battery. At what rate is the energy being dissipated
A circular loop carries a current I = 20A, and the magnetic energy density at the loop's center is equal to 6 mJ/m^3. What is the radius of the loop
q1. a violin string that is 45.5 cm long has a fundamental frequency of 490 hz.what is the speed of the waves on this
How to find out the magnitude of the acceleration
Illustrate at what angle should a curve of radius 140 m be banked, so cars can travel safely at 33 m/s without relying on friction?
A proton is captured by an oxygen-16 atom which in turns emits a deuteron. find the mass number of the product isotope
A block of unknown mass, m, is brought into the configuration shown. It was measured that upon release the block shot upward a maximum distance of 2m. Calculate the mass of this block? The upper spring has a natural length of 1m, and the lower spr..
Find the final velocity of the combined mass after an in elastic collision 500g at 4m/s toward 300g 2 m/s and the change of KE
An electron moving at a speed of vi= 0.960c in the positivex direction collides with another electron at rest, Based only on the original data given in the problem, use conservation of energy to find the speed of the second electron
When switch S in the figure is open, the voltmeter V of the battery reads 3.10V . When the switch is closed, the voltmeter reading drops to 2.96V, Find the emf
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