Consider a scale on which our entire Milky Way Galaxy is about the size (diameter) of a grapefruit. Which of the following best describes the size and distance of the Andromeda Galaxy on the same scale?
A) a grapefruit about 3 meters away
B) a grapefruit about 3 centimeters away
C) a beach ball about the length of a football field away
D) a peanut about 3 centimeters away
E) a grapefruit about 3 kilometers away
A) a grapefruit about 3 meters away
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A hair is placed at one edge between two flat glass plates. When this arrangement is illuminated with yellow light of wavelength (l = 600 nm), a total of 61 dark bands are counted starting at the point of contact between the plates. How thick is the hair? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact
a. 3.6 × 10^-4 m c. 1.8 × 10^-5 m b. 1.8 × 10^-4 m d. 3.6 × 10^-5 m
Multiple-Object Accelerating Systems: A 3.0-kg mass and a 5.0-kg mass hang vertically at the opposite ends of a very light rope that goes over an ideal pulley. If the masses are gently released, what is the resulting acceleration of the masses?
A. 0.00 m/s2 B. 3.7 m/s2 C. 2.5 m/s2 D. 4.9 m/s2 E. 6.1 m/s2
In the condensation theory of the Moon's origin,
a. the Moon broke from a rapidly spinning Earth. b. Earth and its Moon formed from the same cloud of matter. c. the Moon formed elsewhere in the solar nebula and was later captured by Earth. d. the Moon formed when a very massive planetesimal smashed into the young Earth.
The vertical displacement y(x,t) of a horizontal string aligned along the x-axis is given by the equation y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 s-1)t]. What are the (a) speed and (b) amplitude of this wave?
What will be an ideal response?