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3 years ago

Each large pizza can feed three teenage boys. How many pizzas would be needed to feed the

Physics

2 answers:

Blababa [14]3 years ago

6 0

Answer:

19 pizzas

Explanation:

1 pizza = 3 boys

=> 56 ÷ 3 = 18.666666666666.. or about 19 pizzas

Xelga [282]3 years ago

4 0

18.666666666666666 or round to 19

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Some workers are trying to lift up to the third floor of a building, which is 8.0 meters above the ground. The piano is 500 kg w

irina1246 [14]

Answer:

Weight = 4900 N

Explanation:

Given:

Mass of the piano is, $m=500\ kg$

Acceleration due to gravity is, $g=9.8\ m/s^2$

Height to which the piano is raised is 8.0 m.

We are asked to determine the weight of the piano.

We know that, weight of a body is nothing but gravitational force acting on it by the center of Earth. It is equal to the product of mass and acceleration due to gravity.

Weight is independent of height til the height is very less than the radius of Earth. At very high altitudes which are comparable to the radius of Earth, the value of 'g' changes and hence the weight. But, here the height is very small and hence the value of 'g' equals 9.8 m/s² only.

Thus, weight of the piano is given as:

Weight = Mass $\times$ Acceleration due to gravity

Weight = $mg$

Weight = $(500\ kg)(9.8\ m/s^2)=4900\ N$

Weight is a force so, its unit is same as that of force and hence it is measured in Newtons.

Therefore, the weight of the piano is 4900 N.

8 0

3 years ago

Why don’t we feel the gravitational force of a large object such as a skyscraper semi-truck?

Kobotan [32]

Answer:

Se the explanation below

Explanation:

We do not feel these forces of these bodies, because they are very small compared to the force of Earth's attraction. Although its mass is greater than that of a human being, its mass is not compared to the Earth's mass. In order to understand this problem we will use numerical data and the universal gravitation formula, to give validity to the explanation.

Force exerted by the Earth on a human being

$F=G*\frac{m_{1}*m_{2}}{r^2}$

Where:

G = universal gravitation constant = 6.673*10^-11 [N*m^2/kg^2]

m1 = mass of the person = 80 [kg]

m2 = mass of the earth 5.97*10^24[kg]

r = distance from the center of the earth to the surface or earth radius = 6371 *10^3 [m]

Now replacing we have

$F = 6.673*10^{-11} *\frac{80*5.97*10^{24}}{(6371*10^{3})^{2} } \\F = 785[N]$

Force exerted by a building on a human being

Where:

G = universal gravitation constant = 6.673*10^-11 [N*m^2/kg^2]

m1 = mass of the person = 80 [kg]

m2 = mass of the earth 300000 [ton] = 300 *10^6[kg]

r = distance from the building to the person = 2[m]

$F = 6.673*10^{-11}*\frac{80*300*10^6}{2^{2} } \\F= 0.4 [N]$

As we can see the force exerted by the Earth is 2000 times greater than that exerted by a building with the proposed data.

8 0

3 years ago

17. During a game of tug of war, two teams of students pull on opposite sides of a rope. During the

cupoosta [38]

Answer:

Explanation:

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3 years ago

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How do I remove the paint from the carpet. Please I need a real answer.

4vir4ik [10]

Answer:

Explanation:

(water based paint)

If the paint stain is still wet, simply blot the spot with a wet paper towel - don’t scrub, just blot.

If the paint stain is dry, use hot water and a little bit of dish detergent. Let the solution sit for a few minutes to soften the paint.

Once the paint is softened, use a knife or pin to scrape the paint stain. Continue to add more solution as you scrape.

If the paint is still not softening, consider using a handheld steamer while you scrape to eventually remove the paint stain from the carpet.

(latex based paint)

Blot the spot to remove as much wet paint as possible – don’t scrub, or you’ll push the paint further down into the carpeting.

Mix a cup of lukewarm water with one teaspoon of dishwashing detergent – just make sure the detergent is mild.

Work from the outside of the paint stain to the inside, gently blotting the affected area.

After letting the area dry completely, follow up by vacuuming.

(oil based paint)

If the paint stain is dry, you’ll want to use a steamer to soften the stain.

Apply steam directly to the stain.

Simultaneously pick at the paint stain with a needle or a pin to try and break it up.

Continue until stain is removed, without damaging fibers.

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3 years ago

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1The Drifting Rocks are a strange phenomenon still unexplained by science. 2Located in Death Valley, California, the rocks sit o

igor_vitrenko [27]

The description doesn't mention a cause, it isn't in chronological order,
and it doesn't give any solution to the problem.

The only choice left is "fact by fact".

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3 years ago

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