Why does a hot air balloon float?The shape of the balloon prides lift.
The volume of the air displaced by the balloon is less than the volume of the balloon
The weight of the air displaced is less than the volume of the balloon
The weight of the balloon is less than the weight of the air displaced by the balloon
Answers
Right answer: The weight of the air displaced is less than the volume of the balloon
A hot air balloon is a cloth wrap that contains several thousand cubic meters of air inside (a large volume of air). The burner (which is the motor of the balloon and responsible for its elevation) heats the liquid propane to a gaseous state to generate a huge flame, thus heating the air mass inside the balloon. In this way, its density is modified with respect to the air that surrounds it, because the hot air is lighter than the outside air (less dense), causing the balloon to rise and float.
Now, if we know that the density of a body is directly proportional to its mass
and inversely proportional to its volume
:
We can deduce that
by increasing the volume of the body, its density will decrease.
This is proof of Archimedes' Principle:
A body totally or partially immersed in a fluid at rest, experiences a vertical upward thrust equal to the mass weight of the body volume that is displaced.
In this case the fluid is the air outside. So, the warm air inside the balloon, being less dense, will weigh less than the outside air and therefore will receive an upward pushing force or thrust that will make the balloon ascend.
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Maurice directs a beam of light on a sheet of glass at an angle of 51°. What is the angle of refraction in the glass? The refractive index of glass is 1.46.A: 22 degrees B: 29 degrees C: 32 degrees D: 36 degrees
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Answers
Answer:
x = 400 [m]
Explanation:
To solve this problem we must use the following kinematics equations, first, we find the final speed, and then we proceed to find the distance traveled.
where:
Vf = final velocity [m/s]
Vi = initial velocity = 15 [m/s]
a = acceleration = 5 [m/s^2]
t = time = 10 [s]
Note: the positive sign in the Equation indicates that the car is accelerating, i.e. its speed is increasing.
Now replacing
Vf = 15 + (5*10)
Vf = 65 [m/s]
Now using the second equation:
where:
x = distance traveled [m]
x = (65^2 - 15^2)/ (2*5)
x = 400 [m]
an increase in atmospheric carbon dioxide
an increase in biodiversity in the region
a decrease in the use of alternative energy
Answers
The immediate result of deforestation in the Amazon rain forest is an increase in atmospheric carbon dioxide.
What is meant by deforestation ?
Deforestation is the process of cutting down trees and clearing forest areas by burning them on a larger scale for the human purposes.
Here,
According to the information released by the government of Brazil in 2005, it was shown that about 10,000 square miles of the Amazon rainforest had been destroyed.
This is due to the enormous loss of forest habitat which caused because of the higher deforestation done over there on a larger scale.
The amazon rainforest is the largest rainforest in the world. Half of the rainforests of the planet is represented by the Amazon rainforest. It comprises most of the biodiversity in the earth.
As a result of deforestation and burning of trees, the Amazon rain forest has been destroyed.
As per the reports, the cattle sector of the Amazon was mostly responsible for the deforestation.
The deforestation and conversion of the forest areas into land area for cultivation and other purposes lead to the destruction of the Amazon forests. This is because, due to the increased level of deforestation and burning of trees, enormous amount of carbon dioxide was emitted and this resulted in a more temperature atmosphere that caused more destruction to the biodiversity of the Amazon rainforest.
Hence,
The immediate result of deforestation in the Amazon rain forest is an increase in atmospheric carbon dioxide.
To learn more about deforestation, click:
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Answer:
An increase in atmospheric carbon dioxide since the trees were taking in carbon dioxide from the environment
Explanation:
Answers
on Earth's equator indefinitely because its orbit is continually adjusted
to ...
-- be in the plane of the equator,
-- be as perfectly circular as possible,
-- have a period exactly equal to the Earth's rotation period ...
about 23 hours 56 minutes 4 seconds, not 24 hours.
Answers
d = -2 m
a = - 9.81 m/s^2
t = ?
Formula
d = vi*t + 1/2 a t^2
- 2 = 6m/s *t - .5 * 9.81 * t^2
Put the - 2 on the right.
4.905 t^2 + 6 m/s t +2 = 0
a = -4.905 m/s^2
b = 6 m/s
c = 2 m
t = [- b +/- square root(b^2 - 4ac)]/(2a)
t = [ -6 +/- square root (6^2 - 4*(-4.905)*2)] / (- 4.905*2)
t = [-6 +/- 8.674) / - 9.81
t = -14.674/-9.81
t = 1.69 seconds.
Answers
Answer:
The presence of minerals in a country can significantly impact its prosperity in various ways. Minerals, such as precious metals, rare earth elements, and energy resources like coal and oil, can play a pivotal role in a nation's economic development. First, mineral extraction and exportation can generate substantial revenue, contributing to the country's gross domestic product (GDP) and foreign exchange earnings. Additionally, the mining industry often creates job opportunities, fostering employment and income growth. However, the dependence on mineral resources can also lead to economic volatility and resource depletion if not managed sustainably. Moreover, the equitable distribution of wealth generated from mineral resources and effective governance are crucial factors in ensuring that the prosperity derived from these minerals benefits the entire population rather than a select few. Ultimately, the presence of minerals can be a double-edged sword, offering economic opportunities while demanding careful management to achieve lasting prosperity.
Explanation:
10 amps
80 amps
180 amps
Answers
Answer: The current of value 10 ampere runs through the vacuum.
Explanation;
Power of the water heater = 1,200 watts
Voltage applied to the water heater = 120 V
Duration of the use of water heater = 1.5 seconds
The current of value 10 ampere runs through the vacuum.