A bullet shot straight up returns to its starting point in 10 s. What is the initial speed of the bullet, assuming negligible air resistance?
A) 9.8 m/s
B) 25 m/s
C) 49 m/s
D) 98 m/s
C
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The cause of Venus' slow rotation is unknown at present
Indicate whether the statement is true or false
What conclusion can we draw about the motion of a star that does not show any Doppler shift in its spectrum?
A. The star does not have a magnetic field. B. The star may be moving perpendicular to our line of sight. C. The star is spinning fast. D. The star is not moving. E. We cannot draw any conclusions about the motion of this star.
Which of the following statements is an explanation, not an observation?
A) Stars can shine brightly for millions of years. B) Stars shine with energy generated by nuclear fusion in their cores. C) More distant galaxies are moving away from us faster than nearby galaxies. D) All planets orbit the Sun in the same direction and in nearly the same plane.
In a polarized plug, the large slit connects to the hot side and the small slit connects to the neutral, or ground, side
Indicate whether the statement is true or false