Suppose a 0.70-kg mass on a spring that has been compressed 0.26 m has elastic potential energy of 2.20 J. How much further must the spring be compressed to triple the elastic potential energy?
a. 0.45 m
b. 0.71 m
c. 0.78 m
d. 0.19 m
e. 0.52 m
d
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A galaxy is observed receding from Earth with a speed of 9800 km/s. A redshifted spectral line originating in the galaxy is compared to the same spectral line originating in the laboratory
If Hubble's law is valid for this galaxy, what is the ratio of the wavelength of the redshifted line to that of the unshifted line if the Hubble constant is 22 km/s per million light-years? (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s) A) 1.033 B) 1.072 C) 1.052 D) 1.091 E) 1.130
Hydrogen has an absorption line at a rest wavelength of 656.28 nm. This line is shifted to 656.50 nm in the spectrum of a star. How fast is the star moving? Hint: The Doppler shift formula is = where the speed of light is c ? 300,000 km/
A) about 100 km/s away from us. B) about 100 km/s toward us. C) about 1000 km/s away from us. D) about 1000 km/s toward us.
Explain the role of convection on the Sun's surface
What will be an ideal response?
The _______________ states that an observer cannot distinguish locally the difference between inertial forces due to acceleration and uniform gravitational forces due to the presence of a massive object
Fill in the blank(s) with correct word