Ii) water flows with an average speed of 3.0 m/s through a section of a stream that is 30 m wide and 1.0 m deep. the water then enters a 15 m wide section where the average speed of the water is 2.0 m/s. how deep is that 15 m wide section of stream (3 points)?

The 15 m wide section of the stream is 3 m deep.

Explanation:

The Flow rate of the water remains constant throughout.

Flow rate = Velocity x depth x width

Flow rate = (3)(30)(1)

Now the depth,width and velocity of the flow stream has changed but the flow rate still remains same. So,

Assuming depth to be D,

90 = (2)(15)(D)

D = 3 m

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

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