The ________ magnitude of a star depends on its luminosity and distance from us
Fill in the blank(s) with correct word
apparent
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The period-luminosity relation for Cepheid and RR Lyrae variable stars can be used for ______________
Fill in the blank(s) with correct word
A professional skier reaches a speed of 39.6 m/s on a 30° ski slope. Ignoring friction, what was the minimum distance along the slope the skier would have had to travel, starting from rest?
a. 110 m c. 320 m b. 160 m d. 640 m
The time taken by the Moon to circle the sky once and return to the same position among the stars is known as the Moon's _____
A) synodic period B) annular period C) sidereal period D) ecliptic period
Two experiments are performed. In (A), an 18.0-N force pushes horizontally on a 2.00-kg block that then pushes on a 4.00-kg block. In (B), an 18.0-N force pushes on a 4.00-kg block that then pushes on a 2.00-kg block. Which statement is correct?
a. The acceleration is 3.00 m/s2 in both (A) and (B). b. The acceleration is 4.50 m/s2 in both (A) and (B). c. The acceleration is 6.00 m/s2 in both (A) and (B). d. The acceleration is 9.00 m/s2 in both (A) and (B). e. The 2.00-kg block has a 9.00 m/s2 acceleration. The 4.00-kg block has a 4.50 m/s2 acceleration.