The Hubble Space Telescope has been repaired
Indicate whether the statement is true or false
T
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Energy Conservation With Conservative Forces: The figure shows a famous roller coaster ride. You can ignore friction. If the roller coaster leaves point Q from rest, what is its speed at the top of the 25-m peak (point S)
A. 10 m/s B. 22 m/s C. 44 m/s D. 62 m/s E. 120 m/s
The output voltage of a power supply is V = Vo sin (120. t) volts. At t = 0.010 s the output voltage is 4.2 V. What is the rms voltage of the generator?
What will be an ideal response?
Light shines through atomic hydrogen gas that was initially in its ground state. You observe that after awhile much of the hydrogen gas has been excited to its n = 5 state
What wavelength of light entering the gas caused this excitation? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 110 nm B) 91.4 nm C) 95.2 nm D) 2280 nm
Why are astronomers interested in building observatories capable of detecting neutrinos, cosmic rays, and gravitational waves?
A) These things are not forms of light, and therefore can provide different types of information than light about objects that emit them. B) These things are the highest energy forms of light, even more energetic than gamma rays, and therefore can tell us about explosive processes in the universe. C) These things should in principle be much easier to detect than light, which means we could build these observatories cheaply. D) These things are emitted from the same objects that emit x-rays, but unlike x-rays they can be detected with observatories on the ground.