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April swims at v = 1.25 m/s in still water. Starting on the west bank of a south-flowing 50m-wide river, she swims directly east across the river, then immediately turns around and returns to the west bank of the river. Upon reaching this shore, she finds that she is 60 m downstream (south) from her starting point.
(a) What is the speed of the river's current?
(b) If, on first swimming to the east bank, she had wanted to swim straight across the river, ending up directly across the river from her starting point, at what angle (with respect to the east) should have been her heading?
According to what I've been reading, the propellant is moving at subsonic speeds before the throat, and is accelerated to supersonic speeds as it passes the throat. Furthermore, the propellant continues to accelerate as the nozzle expands again. W..
A large truck and a Volkswagen "bug" have a head-on crash. Answer the following questions, and explain your answers.
A surfboard of mass S rests on a frictionless surface. The surfboard is attached to a spring (constant K) which is in turn attached to an immobile wall. The surfboard is displaced a distance of C from equilibrium and then is released.
A dog on a merry-go-round undergoes a 1.2 m/s2 linearacceleration. If the merry-go-round's angular acceleration is .63rad/s2, how far is the dog from the axis of rotation?
A certain LCD projector contains a single thin lens. An object 31.7 mm high is to be projected so that its upright image ?lls a screen 2.8 m high. The object-to-screen distance is 1.33 m. Find the focal length of the projection lens. Answer in units ..
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Estimate the pressure increase required to impart
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