What is the transit method of finding extrasolar planets?
A) measuring the spectrum of the star for a periodic variation in its Doppler shift
B) monitoring a star to detect periodic dips in its brightness from the planet passing behind the star
C) monitoring a star to detect periodic dips in its brightness from the planet passing in front of the star
D) observing a star during the rare occasion of another star passing directly in front of it; slight changes in how the light is bent by gravity can indicate the presence of planets around the closer star
C
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Which of these events is NOT possible?
A) low-mass stars swelling up to produce planetary nebulae B) red giants exploding as Type II supernovae C) close binary stars producing recurrent novae explosions D) white dwarfs and companion stars producing recurrent Type I supernova events E) a white dwarf being found in the center of a planetary nebula
300-nm light has a lower frequency than 500-nm light
a. True b. False Indicate whether the statement is true or false
Collisions in Two Dimensions: A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south. The two cars stick together after the collision. What is the direction of motion of the cars after collision?
A. 36.9° S of E B. 36.9° E of S C. 53.1° S of E D. 53.1° E of S
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°
When the snowballs reach the ground below, A) Debra's snowball will have a higher speed than Mary's. B) Mary's snowball will have a higher speed than Debra's. C) Both snowballs will hit the ground with the same speed. D) Debra's snowball never hits the ground since it is thrown upwards. E) Mary's snowball never hits the ground since it is thrown downwards.