Star A has an apparent magnitude = 3 and star B has an apparent magnitude = 5. Which star is brighter in our sky?
A) Star A
B) Star B
C) There is not enough information to answer the question.
D) The two stars have the same brightness in our sky, but Star A is closer to us than Star B.
A) Star A
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A horse-power is equal to 550
A) J/s. B) Kw-h. C) ft-lb/minute. D) ft-lb/s. E) J/hour.
A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the vertical component of its velocity at the highest point of its trajectory?
A) 0 m/s B) 9.8 m/s C) 19.6 m/s D) 4.9 m/s E) 17 m/s
An 800-N woman stands at rest on two bathroom scales so that one scale shows a reading of 500 N. The reading on the other scale is
A) 200 N. B) 300 N. C) 400 N. D) 800 N. E) none of the above
The colors you see with a prism result because the light is diffracted
a. True b. False Indicate whether the statement is true or false