Suppose that 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 reddest in color
B) the one that is bluest in color
C) the one that is farthest away
D) the one that is closest to us
E) the one that appears smallest in size
C
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Gravitational Force: As a 70-kg person stands at the seashore gazing at the tides (which are caused by the Moon), how large is the gravitational force on that person due to the Moon? The mass of the Moon is 7.35 × 1022 kg, the distance to the Moon is 3.82 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2.
A. 0.24 N B. 0.024 N C. 0.0024 N D. 0.00024 N
Simple Pendulum: Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs slow. Which of the following adjustments of the weight would make it more accurate? (There could be more than one correct choice.)
A. Raise the weight. B. Lower the weight. C. Add more mass to the weight. D. Remove some mass from the weight. E. Increase the amplitude of swing by a small amount.
Red sunset, red lunar eclipses, blue skies, and reflection nebulae are all the result of the ________ of visible light off tiny dust particles
Fill in the blank(s) with correct word
What are some of the uncertainties in obtaining radiometric carbon dates?
What will be an ideal response?