If the velocity of an aircraft is doubled, the kinetic energy of the aircraft is also doubled
a. True
b. False
Indicate whether the statement is true or false
False
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A 75-N box rests on a perfectly smooth horizontal surface. The minimum force need to start the box moving is
A) 75 N. B) 7.5 N. C) 750 N. D) any horizontal force greater than zero.
Graphical Analysis: The figure shows the velocity-versus-time graph for a basketball player traveling up and down the court in a straight-line path. Find the displacement of the player(a) during the first two seconds.(b) between t = 4 s and t = 8 s.
Fill in the blank(s) with the appropriate word(s).
If a star system 30 parsecs distant is found to be broadcasting intelligent radio signals, then their news is already approximately ________ years old
A) 10 B) 30 C) 100 D) 300 E) 1,000
A 34-kg child on an 18-kg swing set swings back and forth through small angles
If the length of the very light supporting cables for the swing is how long does it take for each complete back-and-forth swing? Assume that the child and swing set are very small compared to the length of the cables. A) 4.4 s B) 4.8 s C) 5.3 s D) 5.7 s