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oksano4ka [1.4K]

3 years ago

14

If I drop a feather and a elephant from an equal height in a vacuum which will hit the ground first?

2 answers:

rewona [7]3 years ago

8 0

Whichever one you drop first will hit the ground first. If you drop them simultaneously, and they don't interfere with each other on the way down, then they will hit the ground simultaneously.

attashe74 [19]3 years ago

4 0

They will both hit the ground at the same time, as there is no air resistance in a vacuum, and weight does not determine which object will fall faster even where there is gravity.

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A spherical balloon has a radius of 7.40 m and is filled with helium. Part A How large a cargo can it lift, assuming that the sk

malfutka [58]

Answer:

The mass of the cargo is $M = 188.43 \ kg$

Explanation:

From the question we are told that

The radius of the spherical balloon is $r = 7.40 \ m$

The mass of the balloon is $m = 990\ kg$

The volume of the spherical balloon is mathematically represented as

$V = \frac{4}{3} * \pi r^3$

substituting values

$V = \frac{4}{3} * 3.142 *(7.40)^3$

$V = 1697.6 \ m^3$

The total mass the balloon can lift is mathematically represented as

$m = V (\rho_h - \rho_a)$

where $\rho_h$ is the density of helium with a value of

$\rho_h = 0.179 \ kg /m^3$

and $\rho_a$ is the density of air with a value of

$\rho_ a = 1.29 \ kg / m^3$

substituting values

$m = 1697.6 ( 1.29 - 0.179)$

$m = 1886.0 \ kg$

Now the mass of the cargo is mathematically evaluated as

$M = 1886.0 - 1697.6$

$M = 188.43 \ kg$

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3 years ago

What was the name of the voyages taken by Zheng he during the Ming dynasty on behalf of China

telo118 [61]

Answer:

Ming treasure voyages

Explanation:

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3 years ago

sveticcg [70]

Answer:

I believe the answer is A and D.

I am unsure of C.

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Think about a typical school day. In the space provided below, describe how each of the different forms of energy we have learne

Nezavi [6.7K]

Answer:

During a typical school day all forms of eneergy is being utilised and also transfer of energy takes place from one form to another.

Explanation:

Chemical energy- A bunsen burner burning a beaker filled with water.

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Electrical energy- Running Fans and lights in a classroom by switches.

Solar energy- Solar energy harnessed by solar panels to run the fans and lights by converting it into electrical energy.

Potential energy- A ball being held by a student at a certain height possesses energy due to gravity.

Kinetic energy- The same ball being left by the boy from a certain height produces kinetic energy

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2 years ago

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Congugar verbos en primera persona del singular

stira [4]

This is Spanish !!!!

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3 years ago