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LenaWriter [7]
4 years ago
12

A riverbed slopes steeply down a hill. Which statement BEST explains the water’s potential energy at the top and bottom of the h

ill, all else being equal?
A. The potential energy of the water at the top of the hill will be less than the potential energy at the bottom because the water at the top is higher in Earth’s gravitational field.

B.The potential energy of the water at the top of the hill will be greater than the potential energy at the bottom because the water at the top is higher in Earth’s gravitational field.

C. The potential energy of the water at the top of the hill will be less than the potential energy at the bottom because the water at the bottom is higher in Earth’s gravitational field.

D. The potential energy of the water at the top of the hill will be greater than the potential energy at the bottom because the water at the bottom is higher in Earth’s gravitational field.
Physics
1 answer:
sergejj [24]4 years ago
7 0

B

Potential energy is the energy intrinsic of an object due to its relative position or motion, charge it holds, or stress within itself.

Explanation:

The water at the top of the hill can do work, when compared to the water at the bottom of the hill, because it is capable of acceleration, by gravity, down the hill and this kinetic energy can then be used to turn turbines to produce electricity.  The higher the elevation of the summit of the hill the higher the potential energy of the water at the top. The potential difference is the difference in potential energy of the water at the top and that at the bottom (which translates to the height of the hill).

Learn More:

For more on potential energy check out;

brainly.com/question/3076614

brainly.com/question/12489105

#LearnWithBrainly

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Ilia_Sergeevich [38]
3.92s
Ultrasound works by the waves traveling to the object, bouncing off, then returning. So the distance traveled is twice that of the actual distance.
Therefore d=6,000m
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6000 = 1530 * t
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3 0
3 years ago
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Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 80.5 N, Jill pulls with 81.7 N in the
Gnesinka [82]

Answer:

F = 233.52 N,  θ' = 351.41º

Explanation:

In this exercise we must find the net force applied on the donkey.

For this we use Newton's second law, where we create a reference frame with the horizontal x axis

let's decompose the forces

Jack

        = 80.5 N

Jill

       cos 45 = F_{2x} / F₂2

       sin 45 = F_{2y} / F₂2

       F_{2x} = F₂ cos 45

       F_{2y} = F₂ sin 45

       F_{2x} = 81.7 cos 45 = 57.77 N

       F_{2y} = 81.7 sin 45 = 57.77 N

Jane

      cos (270 + 45) = F_{3x} / F₃3

      sin 315 = F_{3y} / F₃

      F_{3x} = 131 cos 315 = 92.63 N

      F_{3y} = 131 sin 315 = -92.63 N

the force can be found in each axis

X axis

         F_{x} = F_{1x} + F_{2x} + F_{3x}

         F_{x} = 80.5 +57.77 + 92.63

         F_{x} = 230.9 N

Axis y

         F_{y} = F_{1y} + F_{2y} + F_{3y}

         F_{y} = 0 + 57.77 -92.63

         F_{y} = -34.86 N

we can give the result in two ways

a) F = (230.9 i ^ - 34.86 j ^) N

b) in the form of module and angle

we use the Pythagorean theorem

         F = √(Fₓ² + F_{y}²

        F = √(230.9² + 34.86²)

        F = 233.52 N

let's use trigonometry for the angle

        tan θ = \frac{F_y}{F_x} }

        θ = tan⁻¹ (\frac{F_y}{F_x} })

        θ = tan⁻¹ (-34.86 / 230.9)

        θ = -8.59º

if we measure this angle from the positive side of the x-axis counterclockwise

          θ' = 360 -θ

          θ‘= 360- 8.59

          θ' = 351.41º

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While the current in the wire produces a magnetic field and exerts a force on the needle. The insulation on the wire becomes energized and exerts a force on the needle. Hence, the compass needle moves and changes its position.

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