A river flows due east at 2.0 m/s. A boat crosses the 300-m-wide river by maintaining a constant velocity of 15 m/s due north relative to the water. If no correction is made for the current, how far downstream does the boat move by the time it reaches the far shore?
a. 80 m
b. 30 m
c. 25 m
d. 40 m
e. 50 m
d
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A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The net force on the body
a. is zero. b. has its largest magnitude. c. points up. d. points down.
A baseball is pitched, reaching the batter with a speed of 37 m/s and is hit such that it returns on the same line at 48 m/s. If the ball was in contact with the bat for 0.22 seconds, what was the average acceleration experienced by the ball during the time of contact?
A. 220 
B. 41
C. 390
D. 170
Gravity waves are produced when a mass accelerates
Indicate whether the statement is true or false
In the closed universe model, the geometry of spacetime in two dimensions resembles the surface of a
A) saddle. B) cylinder. C) flat piece of paper. D) pyramid. E) sphere.