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The energy of the first excited state of a hydrogen atom is -0.34 eV ± 0.0003 eV. What is the average lifetime of for this state?
What is height of the cliff
A skier is slinding downhill at 11 m/s when she reaches an icy path on which her skies more freely with negligible friction. find the speed of the skier at the bottom of the icy path
Assume that 36% of the body of a person floating in the Dead Sea will be above the water line, Find the density of the water in the Dead Sea
A magnifying glass has a converging lens of focal length of 18.80cm. At what distance from a nickel must you hold this lens to get an image with a magnification of +2.47.
Then find the force between them as a function of distance h. describe why the sign of the force does (or does not) make sense to you.
A distant galaxy emits light that has a wavelength of 699.1 nm. On earth, the wavelength of this light is measured to be 701.6 nm, Decide whether this galaxy is approaching or receding from the earth
The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.53 m and 1.03 m, respectively. The respective rotational speeds are 449 rev/min and 4147 rev/min. Compute the speeds of the tips of both rotors.
A piece of Nichrome wire has a radius of 5.50 10-4 m. It is used in a laboratory to make a heater that uses 3.00 102 W of power, estimate the necessary length of wire
find magnitudes of the tension forces in the first two ropes. what is the velocity of the cart when it reaches its greatest y coordinate.
An artillery shell is red with an initial velocity of 328 m/s at 51.1 degrees above the horizontal. To clear an avalanche, it explodes on a mountainside 42.1 s after fi ring. What are the (a) x and (b) y coordinates of the shell where it explod..
A person has severe hearing loss that reduces the intensity in his inner ear by 31.5 dB. What amplification factor is needed for this person
An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.4 10-6 T. What is the intensity S of the wave
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