Al is moving by you at a very high speed (close to the speed of light). You get out a clock and measure 10 seconds going by. If you also watch a clock in Al's ship, how much time will you see it record during your 10 seconds?
A) Al's clock will record less than 10 seconds.
B) Al's clock will record more than 10 seconds.
C) Al's clock will agree that 10 seconds go by.
A
Twin sisters, Gwen and Jackie, were both 20 years old in the year 2000. Jackie took off on a round trip to Vega, 25 light-years away. She traveled at an average speed very close to the speed of light—say, 0.9999c.
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What is the maximum radiation pressure exerted by sunlight in space (S = 1350 W/m2) on a highly polished silver surface?
A. 1.4 × 10?2 Pa B. 0.12 Pa C. 9.0 × 10?6 Pa D. 4.5 × 10?5 Pa E. 2.3 × 10?6 Pa
A light year is the unit of _____________
Fill in the blank(s) with the appropriate word(s).
It's 6 a.m. and the Moon is at its highest point in your sky (crossing the meridian). What is the Moon's phase?
A) new B) first quarter C) full D) third quarter
The change in constellations with the seasons are caused by ________.
A. the rotation of Earth B. the Sun's orbit around the center of the galaxy C. zodiacal shift D. the precession of Earth's axis E. the revolution of Earth