Answer:
A) 11223450 J
B) 18705750 J
Explanation:
Work done = force x distance moved.
Force of fluid at bottom of the pool = pghA
Where
P = density of water = 1000 kg/m3
g = acceleration due to gravity = 9.8 m/s2
h = depth of water = 1.5 m
A = area of pool of diameter d = 18 m
A = (¶d^2)/4 = (3.142 x 18^2)/4 = 254.5 m2
Total wall height of pool = 3 m
Force on pool bottom due to water is
F = 1000 x 9.8 x 1.5 x 254.5 = 3741150 N
A) work (in Joules) required to pump all of the water over the side
Height of wall H = 3 m
Work = F x H = 3741150 x 3 = 11223450 J
B) work (in Joules) required to pump all of the water out of an outlet 2m over the side?
Total height will be 2 + 3 = 5 m
Work = F x H = 3741150 x 5 =
18705750 J
<span>D. in back of the lens, because the rays are unaffected until it goes through the lens. In that moment the direction of the rays is modified, making them get closer to each other and all of them converge in a point behind the lens.</span>
Answer: 1
Explanation:
Given
Tension is the string 
mass of object 
Tension is greater than the weight of the object i.e. elevator is moving upward
we can write
Answer: "One object speeds up before it slows to a stop
"
(the top one)
Explanation:
Ok, first a little recall on how to read this type of graph.
If the points are far apart, the object is moving fast.
If the points are close together, the object is moving slow.
If the distance between the points changes then the velocity of the object changes, which means that the object is accelerated.
If we have a lot of points clustered in one location, then the object is not moving.
We can see:
The top object starts slow, then it increments the speed, then it slows down again, and then it comes to stop.
The bottom object starts fast, and it slows down.
then:
"One object speeds up before it slows to a stop
"
This describes the motion of the top object, this is the only correct option that describes one of the graphs.
The answer is downwards because the ball is pulling down the spring due to its weight
