Which photo shows what we call a first-quarter moon? (Note: Assume these photos were taken in the Northern Hemisphere.)

A) 1
B) 2
C) 3
D) 4


B) 2

Physics & Space Science

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How are the jets produced by radio galaxies similar to those produced by protostars?

What will be an ideal response?

Physics & Space Science

What speed dilates 1.000 second into 70.71 seconds?

A) 0.9999c B) 0.9666c C) 0.9888c D) 0.9777c E) 0.8777c

Physics & Space Science

Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions

Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30° above the horizontal. Which of the following statements are true about just before the snowballs reach the ground below? (There could be more than one correct choice.) A) Debra's snowball will stay in the air longer than Mary's snowball. B) Mary's snowball will stay in the air longer than Debra's snowball. C) Both snowballs will take the same amount of time to hit the ground. D) Debra's snowball has exactly the same acceleration as Mary's snowball. E) Mary's snowball has a greater downward acceleration than Debra's snowball.

Physics & Space Science

A particle of light is called a ________________

Fill in the blank(s) with correct word

Physics & Space Science