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Grace [21]
2 years ago
15

A boy pushes a rock up a hill in 20 seconds. If he applied a force of 20 N over a distance of 5 m on the rock, calculate the pow

er required in this situation.
80 watts
0.2 watts
2,000 watts
5 watts
Physics
1 answer:
aksik [14]2 years ago
4 0

Here is your answer

5 watts

REASON :

Given,

t= 20 secs

F= 20 N

s (displacement)= 5m

Now,

Power= \frac{Work done}{time}

P= W/t ...... (i)

W= F×s×cos(theta)

W= 20×5 × 1 (theta is 0 degree; so cos0= 1)

W= 100 J

Hence,

P= 100/20 (from eq. i)

P= 5 watts

HOPE IT IS USEFUL

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timofeeve [1]

Answer:

d = 3.54 x 10⁴ Km

Explanation:

Given,

The distance between the two objects, r = 2.5 x 10⁴  Km

The gravitational force between them, F = 580 N

The gravitational force between the two objects is given by the formula

                                         F = GMm/r² newton

When the gravitational force becomes half, then the distance between them becomes

Let us multiply the above equation by 1/2 on both sides

                                        ( 1/2) F = (1/2) GMm/r²

                                                   =  GMm/2r²

                                                   =  GMm/(√2r)²

Therefore, the distance becomes √2d, when the gravitational force between them becomes half

                                           d = √2r = √2 x 2.5 x 10⁴  Km

                                               = 3.54 x 10⁴  Km

Hence, the two objects should be kept at a distance, d = 3.54 x 10⁴  Km so that the gravitational force becomes half.

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Volcanoes are often formed at plate boundaries. This is a convergent plate boundary. From the choices listed, pick the correct d
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F 1 = 40 N, d 1 = 6 m;
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A hockey puck slides off the edge of a table with an initial velocity of 23.2 m/s and experiences no air resistance. The height
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Answer:

15.1°

Explanation:

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v_x = 23.2 m/s

Instead, the vertical velocity changes, due to the presence of the acceleration due to gravity:

v_y(t)= v_{y0} -gt (1)

where

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Since the hockey puck falls from a height of h=2.00 m, the time it needs to reach the ground is given by

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Now that we have both components of the velocity, we can calculate the angle with respect to the horizontal:

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Explanation:

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