A concave mirror has a focal length of 20 cm. What is the position (in cm) of the resulting image if the image is inverted and four times smaller than the object?
a. 15
b. 25
c. 50
d. 100
e. ?15
b
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Light can behave as a particle or as a wave
a. True b. False Indicate whether the statement is true or false
In 1924, Edwin Hubble proved that the Andromeda Galaxy lay far beyond the bounds of the Milky Way, thus putting to rest the idea that it might have been a cloud within our own galaxy. How was he able to prove this?
A) He proved this by observing individual Cepheid variable stars in Andromeda and applying the period-luminosity relation. B) He was able to measure the parallax of the Andromeda Galaxy. C) He found that the universe is expanding, and therefore concluded that Andromeda must lie outside our own galaxy. D) He was the first person ever to look through a telescope at the object we now call the Andromeda Galaxy.
When the standing wave pattern in a pipe is NANA, the pipe has which of the following set of properties? (N stands for node, A for antinode.)
a. It is open at both ends. b. It is closed at both ends. c. It is open at one end and closed at the other end. d. Any of the above could be true.
A cart of weight 15.0 N is accelerated across a level surface at 0.15 m/s2 . What net force acts on the wagon? (g = 9.8 m/s2)
a. 22 N b. 0.23 N c. 2.3 N d. 10 N e. 100 N