Project #84800 - physics

A novice golfer on the green takes three strokes to sink the ball. The successive displacements of the ball are d1 = 3.90 m to the north, d2 = 2.00 m northeast, andd3 = 1.10 m at θ = 35.0° west of south (figure below). Starting at the same initial point, an expert golfer could make the hole in what single displacement?

 m
 ° (north of east)

 

 
 
A firefighter a distance d from a burning building directs a stream of water from a fire hose at angle θi above the horizontal as in the figure. If the initial speed of the stream is vi, at what height h does the water strike the building? (Use any variable or symbol stated above along with the following as necessary: g.)
h = 
 
 
 
A soccer player kicks a rock horizontally off a 36.0-m-high cliff into a pool of water. If the player hears the sound of the splash 2.88 s later, what was the initial speed given to the rock? Assume the speed of sound in air is 343 m/s.
 m/s
 
 
 
A boy stands on a diving board and tosses a stone into a swimming pool. The stone is thrown from a height of 2.50 m above the water surface with a velocity of 4.00 m/s at an angle of 60.0° above the horizontal. As the stone strikes the water surface, it immediately slows down to exactly half the speed it had when it struck the water and maintains that speed while in the water. After the stone enters the water, it moves in a straight line in the direction of the velocity it had when it struck the water. If the pool is 3.67 m deep, how much time elapses between when the stone is thrown and when it strikes the bottom of the pool?
 s
 

 

Subject Science
Due By (Pacific Time) 10/02/2015 11:00 pm
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