For a galaxy 200 Mpc away, a useful standard candle would be the ________
Fill in the blank(s) with correct word
Type I supernova
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A person squeezes a balloon horizontally with both hands while holding it at rest, decreasing its width by a certain amount. Is the work done on the balloon by the person positive, negative, or zero?
A. Positive B. Negative C. Zero D. One needs more information to answer.
All of the following may be represented by vectors except:
a. velocity b. speed c. acceleration d. displacement.
A diffraction grating is to be used to find the wavelength of the light in the emission spectrum of a gas. The grating spacing is not known,
but a light having a known wavelength of 632.8 nm is deflected by 43.2° away from the central maximum in the second order by this grating. Light of the wavelength to be measured is deflected by 48.2° away from the central maximum in the second order. What is the wavelength of this light?
A 2-hp motor can do the same amount of work as a 1-hp motor in ______________ the time. n
Fill in the blank(s) with correct word