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2 years ago

Jill is pushing a box across the floor. Which represents the upward force perpendicular to the floor?

Physics

1 answer:

Georgia [21]2 years ago

5 0

Answer:

When Jill is pushing a box across a floor, it represents the upward motion and it is natural force is applied.

So it is represented as FN and normal force takes place in considering the force perpendicular to the floor.

It seems to support that forced applied on an object when the object is in contact with other.

Explanation:

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The cable of a crane is lifting a 950 kg girder. The girder increases its speed from 0.25 m/s to 0.75 m/sin a distance of 5.5m

Umnica [9.8K]

Explanation:

a) How much work is done by gravity?

w = f x d
w = 950 x 10 x 5.5 = 52250j

b) How much work is done by tension?

v²=u²+2as
0.75²=0.25²+2a x5.5
0.56=0.06+2a x5.5
2a x5.5 = 0.56 - 0.06
2a x 5.5 =0.5
11a=0.5
a = 0.5/11 = 0.05m/s²

w = f x d

w = 950 x 0.05 x 5.5 = 261.25j

7 0

2 years ago

A steel needle when placed carefully on water can be made to float.when the detergent is added to the water it sink.explain the

Dvinal [7]

Answer:

The surface tension of plain water can cause a needle to float.

Evidently, the addition of detergent to the water reduces the surface tension of the liquid causing the needle to sink.

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1 year ago

Calculate the gravitational potential energy of the interacting pair of the Earth and a 4 kg block sitting on the surface of the

STALIN [3.7K]

Answer:

- 2.425 x 10^5 J

Explanation:

The gravitational potential energy between earth and the bock is given by

$U=-G\frac{Mm}{r}$

Where, G is the universal gravitational constant = 6.67 x 10^-11 Nm^2/kg^2

M is the mass of earth = 5.8 x 10^24 kg

m is the mass of block = 4 kg

r be the radius of earth = 6380 km = 6380 x 10^3 m

by substituting the values in the above expression, we get

$U=-6.67\times10^{-11}\frac{5.8\times 10^{24}\times 4}{6380\times 10^{3}}$

U = - 2.425 x 10^5 J

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2 years ago

Read 2 more answers

In a free body diagram, the force arrows always point what way?

swat32

Forces are presented as straight arrows pointing in the direction they function on the body.

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2 years ago

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Shine the flashlight on the liquid crystal sheet. Did you observe evidence that light carries energy?

Artemon [7]

Answer:

no i did not observe anything

Explanation:

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2 years ago