It is harder to map the structure of the Milky Way in visible wavelengths than with radio and infrared waves
Indicate whether the statement is true or false
TRUE
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How many planet Earths could fit inside the Sun?
A) 110 B) about a thousand C) a little over a million D) almost ten million E) close to a billion
The SI unit of mass, the kilogram, is currently defined
A) as 10-22 the mass of the Earth's moon. B) as 10-24 the mass of the Earth. C) by the President's weight. D) by a prototype platinum-iridium cylinder kept at the International Bureau of Weights and Measures in Sevres, France. E) the mass of 5.9786332 × 1026 protons.
A 1.0-kg object moving 9.0 m/s collides with a 2.0-kg object moving 6.0 m/s in a direction that is perpendicular to the initial direction of motion of the 1.0-kg object. The two masses remain together after the collision, and this composite object then collides with and sticks to a 3.0-kg object. After these collisions, the final composite (6.0-kg) object remains at rest. What was the speed of the 3.0-kg object before the collisions?
A. 15 m/s B. 10 m/s C. 5.0 m/s D. 20 m/s E. 25 m/s
Four traveling waves are described by the following equations, where all quantities are measured in SI units and y represents the displacement
I: y = 0.12 cos(3x + 2t) II: y = 0.15 sin(6x - 3t) III: y = 0.23 cos(3x + 6t) IV: y = -0.29 sin(1.5x - t) Which of these waves have the same speed? A) I and III B) I and IV C) II and III D) I and II E) III and IV