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. True b. False Indicate whether the statement is true or false
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
A horse-power is equal to 550
A) J/s. B) Kw-h. C) ft-lb/minute. D) ft-lb/s. E) J/hour.
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