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3 years ago

How much work does a man perform on a lawnmower if he applies 25 N of force to push it 100 meters

Physics

2 answers:

egoroff_w [7]3 years ago

8 0

Explanation:

Solution,

Given:-

Force applied (F)=25 N
Distance travelled (S)=100m

By the formula of work, we have

W=F×S
W=25×100
W=2500 J

So, the work done is 2500 J.

zmey [24]3 years ago

3 0

Force=25N
Displacement=100m

$\\ \sf\longmapsto Work\:Done=Force\times Displacement$

$\\ \sf\longmapsto Work\:Done=25(100)$

$\\ \sf\longmapsto Work\:Done=2500J$

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Vlad1618 [11]

Answer:

F = 1.128 10⁸ Pa

Explanation:

Pressure is defined by

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we calculate

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3 years ago

What is the refractive index of air if light travels through it at 3.0 108 m/s?

olchik [2.2K]

Answer:

n = c/v = (3.00 x 108 m/s)/(2.76 x 108 m/s) = 1.09. This does not equal any of the indices of refraction listed in the table.

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3 years ago

Two satellites A and B orbit the Earth in the same plane. Their masses are 5 m and 7 m, respectively, and their radii 4 r and 7

Dmitry [639]

Answer:

The ratio of their orbital speeds are 5:4.

Explanation:

Given that,

Mass of A = 5 m

Mass of B = 7 m

Radius of A = 4 r

Radius of B = 7 r

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$v_{A}=\sqrt{\dfrac{GM_{A}}{R_{A}}}$ ......(I)

The orbital speed of satellite B,

$v_{B}=\sqrt{\dfrac{GM_{B}}{R_{B}}}$ ......(I)

We need to calculate the ratio of their orbital speeds

Using equation (I) and (II)

$\dfrac{v_{A}}{v_{B}}=\sqrt{\dfrac{\dfrac{GM_{A}}{R_{A}}}{\dfrac{GM_{B}}{R_{B}}}}$

Put the value into the formula

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Answer:

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Explanation:

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3 years ago

An airplane cruises at 900 km/h relative to the air. It is flying from Denver, Colorado, due west to Reno, Nevada, a distance of

Ulleksa [173]

Answer:

26.5 minutes

Explanation:

When the airplane is flying due West from Denver to Reno, the due-East wind with speed of 80km/h would reduce the ground speed by 80 km/h.

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On the other hand, when it returns from Reno to Denver in the due-East direction, the due-East wind with speed of 80km/h would add to the ground speed by 80 km/h

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3 years ago