In the sum A + B + C, A is accurate to 5 decimal places, B is accurate to 2 decimal places, and C is accurate to 3 decimal places. What is the correct number of decimal places in the sum?
A) 2
B) 3
C) 4
D) 5
E) 10
A
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Suppose that Earth's rotation axis were tilted by 45 degrees instead of 23.5 degrees. Which of the following would be true, and why?
A) The seasons would be more extreme, because the Sun's rays would be more direct in summer and less direct in winter. B) The seasons would be more extreme, because the Earth's surface would be closer to the Sun in the summer and farther from the Sun in the winter. C) The seasons would be less extreme, because the Sun's rays would be less direct in summer and more direct in winter. D) The seasons would be less extreme, because the Earths' surface would be farther from the Sun in the summer and closer to the Sun in the winter.
In the future, adaptive optics will greatly enhance the resolution of the Hubble Space Telescope
Indicate whether the statement is true or false
A binary system that looks like the one depicted in this painting should shine brightly in x-rays. Which one of the four labeled regions is the source of most of the x-rays?
A) Region I B) Region II C) Region III D) Region IV
Two charged particles 1 m apart exert a 1-N force on each other. If the particles are instead 0.5 m apart, the force on each particle will be
A) 1.0 N. B) 2.0 N. C) 4.0 N. D) 8.0 N. E) 16.0 N.