Why do we see a gravitational redshift in the spectrum of the Sun?
A) Gravity makes light heavy, causing it to appear redder.
B) Because of gravity, the Sun is always moving away from us, so we see a redshift.
C) Time runs slower on the Sun than on Earth, making lines in the solar spectrum have lower frequency and hence longer wavelength than normal.
D) Spacetime curvature allows red photons of light to escape the Sun more easily than blue photons, leading to an apparent redshift.
C
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Wave Characteristics: How far does light travel in 1.0 ?s? (c = 3.0 × 108 m/s)
A. 3.0 × 1014 m B. 0.30 km C. 3.0 m D. 30 cm
How much work is done by a person lifting a 2.0-kg object from the bottom of a well at a constant speed of 2.0 m/s for 5.0 s?
a. 0.22 kJ b. 0.20 kJ c. 0.24 kJ d. 0.27 kJ e. 0.31 kJ
The maximum weight that can be held under the conditions illustrated is
1) 104 N. 2) 105 N. 3) 0 N. 4) need more information It is interesting to note that in this case the piston actually is 5) pushed up by air. 6) pulled up by the vacuum.
Determine the magnitude and sense (direction) of the current in the 10-? resistor when I = 1.8 A
a.
1.6 A right to left
b.
1.6 A left to right
c.
1.2 A right to left
d.
1.2 A left to right
e.
1.8 A left to right