A 180-hp engine can deliver, in SI units, an average power of ____. (1 hp = 746 W)
a. 2.4E–1 W
b. 4.1E+3 W
c. 1.3E+5 W
d. 1.8E+2 W
e. 9.3E+2 W
c
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A foul ball is hit straight up into the air with a speed of 30.0 m/s. (a) Calculate the time required for the ball to rise to its maximum height. (b) Calculate the maximum height reached by the ball
(c) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball. (d) Explain why there are two answers to part (c).
A Hooke's law spring is compressed a distance d and is used to launch a mass m vertically to a height h above its starting position. Under the same compression d, the spring is now used to launch a mass of 2m. How high does this second mass rise?
a. h c. h/1.41 b. h/2 d. h/4
A Kuiper Belt object was discovered that may be larger than Pluto
Indicate whether the statement is true or false
When observing an object, such as a space ship that is moving very quickly relative to you, the length of objects on that object will appear to be
A) longer than when they are at rest. B) the same length as when they are at rest. C) shorter than when they are at rest. D) narrower than when they are at rest. E) wider than when they are at rest.