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In a lab here on Earth, ionized hydrogen gas emits brightly at a wavelength of 6563A °.Similar ionized gas in M31 (or the Andromed a galaxy) is observed to emit at a wavelength of roughly 6547A °. What does this tell us about the motion of M31 relative to the Milky Way?
A hypothetical nucleus weighs 1 lb. How many nucleons are in this nucleus and What is the radius of this nucleus
If Michaela needs to wear reading glasses with refractive power of +3.0 D, what is her uncorrected near point
in a particular semiconductor device an oxide layer forms a barrier 0.6 nm wide and 9 ev high between two conducting
Two pieces of steel wire with the same area of transversalsection have lengths "L" and "2L". what is the frequency of the second harmonic of the larger wire
A tennis ball initially moves with a velocity of 26.0 m/s horizontally to the right. A tennis racket strikes the ball, giving it a velocity of 26.0 m/s to the left. Find the initial velocity of the racket
A pot of water is boiling under one atmosphere of pressure. Assume that heat enters the pot only through its bottom, What is the temperature of the heating element in contact with the pot
A 60-W light bulb consumes 60 W of electrical power. Find the intensity (W/m2 ) of the total radiated energy (light and heat) at a distance 4.1 m from the light bulb.
When the Earth, Moon, and Sun form a right triangle, with the Moonlocated at the right angle, as shown in the figure , the Moon is inits third-quarter phase. (The Earth is viewed here from above itsNorth Pole.)
A microscope objective lens has a focal length of 10mm. How close should the object be to the objective lens so that the image is formed in the microscope tube 160mm from the objective lens. FYI the answer is 10.67 mm
a proton accelerates from rest in a uniform electric field of 638 nc. at some later time its speed is 1.28 x 106a find
red light from three separate sources passes through a diffraction grating with 5.50times105 linesm. the wavelengths of
A siren is made by blowing a jet of air through 20 equally spaced holes in a rotating disk. Compute what must be the angular speed ω (in rad/s) of the disk
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