Chris and desiree are resting on an offshore raft after a swim. they estimate that 3.0 m separates the trough from the adjacent crest of each surface wave on the lake. they count 12 crests that pass by the raft in 20.0 s. how fast are the waves moving?
a. 1.2 m/s c. 2.3 m/s
b. 3.6 m/s d. 3.2 m/s

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2

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What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass