Why are astronauts weightless in the Space Station?
A) because the Space Station is traveling so fast
B) because the Space Station is constantly in free-fall around the Earth
C) because there is no gravity in space
D) because the Space Station is moving at constant velocity
B
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Momentum: A satellite with a mass of 200 kg and a speed of 0.800c and a second satellite with a mass of 100 kg and a speed of 0.600c are traveling toward each other in deep space. The satellites collide and somehow manage to stick together. What is the mass of the combined object after the collision?
A. 300 kg B. 389 kg C. 416 kg D. 457 kg E. 587 kg
Which of the following studies is best suited to astronomical observations that fall into the category called timing?
A) studying how different planets differ in their surface compositions B) studying how a star's brightness varies over a period of 3 years C) measuring the rotation rate of a distant star D) determining the age of the solar system
Stellar paralax proves that Earth is
a. rotating. b. revolving. c. precessing. d. an oblate spheroid.
Conglomerate and breccia are classified as ______________ rocks
Fill in the blank(s) with correct word