The light from a distant star is shifted such that the peak of its spectrum, at 620 nm, is shifted to 635 nm. What is its radial velocity relative to Earth?
A. -0.11c
B. -0.024c
C. -0.15c
D. -0.012c
B. -0.024c
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According to the text, an orbiting object having energy E < 0 follows an elliptical orbit. When we specify the numerical value for an object’s energy, we are implicitly comparing it to the energy the object has in some reference situation. So, when we say that E < 0 in this case, we are comparing the energy of the orbiting object to the energy of an object with the same mass that is
A. At rest at the primary’s center. B. At rest on the primary’s surface. C. In a circular orbit just above the primary’s surface. D. At rest at r = ?. E. Some other situation (specify).
A ten-loop coil having an area of 0.23 m2 and a very large resistance is in a 0.047-T uniform magnetic field oriented so that the maximum flux goes through the coil
The coil is then rotated so that the flux through it goes to zero in 0.34 s. What is the magnitude of the average emf induced in the coil during the 0.34 s? A) 0.0032 V B) 0.00 V C) 0.032 V D) 0.32 V E) 1.0 V
A lens that is thicker at the center than at the edge is
a. a diverging lens only. b. a convex lens only. c. a converging lens only. d. both a convex lens and a converging lens.
What speed is required for a length to contract to 80% of its proper length?
A. 0.80 c B. 0.60 c C. 0.40 c D. 0.20 c E. 0.50