What are the advantages and disadvantages for methods used to reduce the impact of human activity?

A spherical balloon has a radius of 7.15 m and is filled with helium. The density of helium is 0.179 kg/m^3, and the density of

tekilochka [14]

The largest mass of cargo the balloon can lift is 791.06 kg

First, we need to calculate the mass of helium.

Since the radius of the spherical balloon is r = 7.15 m, its volume is V = 4πr³/3.

The volume of the balloon also equals the volume of helium present.

Now, the mass of helium m = density of helium, ρ × volume of helium, V

m = ρV

Since ρ = 0.179 kg/m³

m = ρV

m = ρ4πr³/3.

m = 0.179 kg/m³ × 4π(7.15 m)³/3

m = 0.179 kg/m³ × 4π(365.525875 m³)/3

m = 0.179 kg/m³ × 1462.1035π m³/3

m = 261.7165265π/3 kg

m = 822.207/3 kg

m = 274.07 kg

Since the mass of the skin and structure of the balloon is 910 kg, the total mass, M of the balloon = mass of skin and structure + mass of helium gas is 910 kg + 274.07 kg = 1184.07 kg.

The weight of this mass W = Mg where g = acceleration due to gravity.

The buoyant force on the balloon due to the air is the weight of air displaced, W' = mass of air, m' × acceleration due to gravity, g.

W' = m'g

Now, the mass of air m' = density of air, ρ' × volume of air displaced, V'

We know that the volume of air displaced, V' = volume of balloon, V

So, V' = V = 4πr³/3.

Since the density of air, ρ' = 1.29 kg/m³,

m' = ρ'V

m = 1.29 kg/m³ × 4π(7.15 m)³/3

m = 1.29 kg/m³ × 4π(365.525875 m³)/3

m = 1.29 kg/m³ × 1462.1035π m³/3

m = 1886.113515π/3 kg

m = 5925.4/3 kg

m = 1975.13 kg

So, the net weight W" that the balloon can lift is W" = W' - W = m'g - Mg = (m' - M )g = (1975.13 kg - 1184.07 kg)g = 791.06g.

So, the net mass m" = W"/g = 791.06g/g = 791.06 kg

This net mass is the largest mass of cargo that the balloon can lift.

Thus, the largest mass of cargo the balloon can lift is 791.06 kg

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8 0

3 years ago

Internal energy changes that do not register on a thermometer are due to changes in the ______ energy of the particles.

raketka [301]

<span>Internal energy changes that do not register on a thermometer are due to changes in the p</span>otential energy of the particles.

<span>Explanation: A thermometer measures the temperature, which is a measure of the average kinetic energy of the particles. </span>

I hope this helps! :)

4 0

3 years ago

Read 2 more answers

“Do you think that the role of culture, gender,

Serjik [45]

Answer:

this is based on your opinion but mine is...

Explanation:

Do you think that the role of culture, gender, and/or race has changed in sclence between the times we are learning about and today's times? If so, how? If not, explain your thoughts?

Yes by how because Race’ cannot be biologically defined due to genetic variation among human individuals and populations. (A) The old concept of the “five races:” African, Asian, European, Native American, and Oceanian. According to this view, variation between the races is large, and thus, the each race is a separate category. Additionally, individual races are thought to have a relatively uniform genetic identity. (B) Actual genetic variation in humans. Human populations do roughly cluster into geographical regions. However, variation between different regions is small, thus blurring the lines between populations. Furthermore, variation within a single region is large, and there is no uniform identity.

3 0

3 years ago

A 90 kg firefighter needs to climb the stairs of a 20-m-tall building while carrying a 40 kg backpack filled with gear. How much

Alexxx [7]

The power required will be equal to 463.3 watt

Power is defined as the rate of work

$P=\frac{W}{t}$

here P is power , W is work done , t is time taken

work done is defined as force times displacement

here s is displacement

here total force will be the weight of the firefighter plus the weight of gear

therefore F=(90+40)×9.8 N

so substituting value in equation of power we get

P= $\frac{25480}{55}$

p=463.3 watt

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7 0

2 years ago

rank the reservoirs of freshwater on earth by volume, with that containing the highest volume on top.

lukranit [14]

The freshwater reservoirs on earth are ranked by volume, with the one with the biggest volume at the top is-

1. ice caps; 2. groundwater; 3. lakes; 4. rivers.

<h3>Explain the freshwater reservoirs on earth?</h3>

The atmosphere, the earth's surface, and the earth's interior are the three main locations where water can be kept.

Oceans, glacier ice, underground, lakes, soil humidity, living organisms, atmospheric atmosphere, and rivers are examples of these reservoirs, which are used to store water.
There is an estimated 1.386 billion km3 (330 million cubic miles) of water on Earth, of which 97.5% is salt water and 2.5% is fresh water.
Only 0.3% of a fresh water is liquid at the surface.
More than 70% of freshwater is utilized for agriculture in the majority of the world's areas.
An estimated 50% increase in agricultural output and a 15% increase in water flows are needed by 2050 to feed a globe of 9 billion people.

Thus, the freshwater reservoirs on earth are ranked by volume, with the one with the biggest volume at the top is-

1. ice caps
2. groundwater
3. lakes
4. rivers

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7 0

1 year ago