Suppose we look at a photograph of many galaxies. Assuming that all galaxies formed at about the same time, which galaxy in the picture is the youngest?
A) the one that is farthest away
B) the one that is reddest in color
C) the one that is bluest in color
D) the one that is closest to us
E) the one that appears smallest in size
A
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The far side of the Moon was first mapped
A) by early Russian spacecraft. B) by Galileo in 1610 with his first telescope. C) by NASA with its Lunar Orbiters in the 1960s. D) by the Apollo astronauts on the first orbit of the Moon with Apollo 8. E) by William Herschel with his large reflectors in the early 1800s.
Liquid nitrogen at 77.2 K (its saturation temperature) and 100 kPa is in a well-insulated flask having a surface temperature of 100 K. Estimate the convection heat transfer coefficient between the liquid nitrogen and the flask surface. The critical pressure of nitrogen is 33.54 atm.
What will be an ideal response?
The spectral lines of a star will appear ________ if the star is moving away from the Earth.
A. blue shifted (i.e., shifted toward the shorter wavelengths) B. the same (no shift) C. red shifted (i.e., shifted toward the longer wavelengths)
Two baseballs are released at the same time. One is dropped from rest and the other is given an initial horizontal velocity. Which of the following is not true? Ignore atmospheric drag
a. Both baseballs hit the ground at the same time. b. Both have the same vertical component of velocity as they reach impact. c. The horizontal component of velocity increases at a greater rate than the vertical component of velocity for both while they are both in the air. d. The horizontally-released ball has a greater speed than the other ball for the whole trip.