A solar system contains
a. primarily planets.
b. large amounts of gas and dust but very few stars.
c. large amounts of gas, dust, and stars.
d. a single star and planets.
e. thousands of superclusters.
d
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A clown 2 m tall looks at himself in a full-length mirror (floor-to-ceiling). Where in the mirror must he look to see his feet?
a. 1 m from the floor b. 50 cm from the floor c. 25 cm from the floor d. at the bottom of the mirror e. 1.5 m from the floor
The radio waves emitted from Sagittarius A* region take how long to travel to Earth?
A. 220 million years B. 50,000 years C. 100,000 years D. 8.5 years
An artillery shell is fired with an initial velocity of 300 m/s at 55.0° above the horizontal. It explodes on a mountainside 42.0 s after firing. If x is horizontal and y vertical, find the (x, y) coordinates where the shell explodes
A simple magnifying glass has a focal length of 6.0 cm. An object is placed 4.0 cm from it. Sketch a ray diagram and give the characteristics of the image