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3 years ago

15 POINTS! ANSWER CORRECTLY FOR BRAINLIEST!

Physics

2 answers:

Minchanka [31]3 years ago

5 0

Answer:

Explanation: I agree with A

igor_vitrenko [27]3 years ago

5 0

Credit: Larus (Full Credits to Larus I didn't make this answer)

The correct answer is that it is too high for the weather balloons.

The mesosphere refers to the layer of the atmosphere of the Earth. It is present directly above the stratosphere and below the thermosphere. It elongates from about 50 to 85 kilometers above the Earth. The coldest temperatures in the atmosphere of the Earth, that is, around -90 degree C, is found close to the top of the layer.

It is tough to study mesosphere, therefore, less is known about the layer of the atmosphere in comparison to the other layers. It is tough as weather balloons cannot fly high enough to reach the mesosphere. The satellites orbit above the mesosphere, and cannot directly determine the traits of the layer.

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A force of 4 kg weight acts on a body of mass 9.8 kg calculate the acceleration

White raven [17]

Answer:

here given is a weight

then force becomes mg

that is F=Mg

=4*9.8

then by using the formula

F=Ma

a=F/M

=4*9.8/9.8

Explanation:

3 0

3 years ago

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What are the potential products of volcanic eruptions

Nostrana [21]

The ash, cinders, hot fragments, and bombs thrown out in these explosions are the major products observed in volcanic eruptions around the world. These solid products are classified by size. Volcanic dust is the finest, usually about the consistency of flour.

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3 years ago

A 60-kg passenger is in an elevator which is initially at rest. The elevator starts to travel downward. It reaches a downward sp

Delvig [45]

Answer:

a. Acceleration = 1.75 m/s²

b. Force = 105 Newton.

Explanation:

Given the following data:

Mass = 60kg

Final velocity = 7m/s

Time = 4 seconds

Required to find the acceleration and force of the body;

a. To find the acceleration;

Mathematically, acceleration is given by the equation;

$Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}$

Where;

a is acceleration measured in $ms^{-2}$
v and u is final and initial velocity respectively, measured in $ms^{-1}$
t is time measured in seconds.

Since the elevator is starting from rest, its initial velocity is equal to 0m/s.

Substituting into the equation, we have;

$Acceleration = \frac{7 - 0}{4}$

$Acceleration = \frac{7}{4}$

Acceleration = 1.75 m/s²

b. To find the force;

$Force = mass * acceleration$

Substituting into the equation, we have;

$Force = 60 * 1.75$

Force = 105 Newton.

4 0

3 years ago

(a) What is the vapor pressure of water at 20.0ºC ? (b) What percentage of atmospheric pressure does this correspond to? (c) Wha

DENIUS [597]

Answer:

a). Vapour pressure = 2333.141 Pa

b). Percentage of atmospheric pressure = 99 %

c). Percentage of water vapour = 1.4 %

Explanation:

a). From water saturation pressure table,

Vapour pressure of water at 20°C is 17.5 torr

We know, 1 torr = 133.322 Pa

Therefore, 17.5 torr = 2333.141 Pa

Therefore, vapour pressure at 20°C is 2333.141 Pa

b). At 20°C, the pressure at atmospheric unit = 0.0231 atm

= 0.0231 x $10^{5}$ Pa

= 2310 Pa

Therefore, $\frac{2310}{2333.141}$

= 0.99

Therefore percentage of atmospheric pressure = 0.99 x 100

= 99 %

c). We Know

Relative Humidity (Rh)= $\frac{P_{v}}{P_{saturation}}$

where $P_{v}$ is vapour pressure

Rh is given as 100% = 1

∴ 1 = $\frac{P_{v}}{P_{saturation}}$

$P_{v}=P_{saturation}$ = 2333.141 Pa

Now humidity ratio is

$w = \frac{m_{v}}{m_{a}}$ , where $m_{v}$ is mass of vapour

$m_{a}$ is mass of air

$w = 0.622\times \frac{P_{v}}{P_{total}-P_{v}}$

Let the total pressure be $10^{5}$ Pa

$w = 0.622\times \frac{2333.141}{10^{5}-2333.141}$

$w = 0.01485$

Therefore, percentage of water vapour is 0.01485 x 100

= 1.4 %

8 0

3 years ago

Why is respiration considered a chemical change?

igor_vitrenko [27]

Answer:

In the oxidation of glucose, carbon dioxide and water are formed. As new products are formed of different composition and characteristics, the respiration is considered as a chemical change.

Explanation:

hope that works

5 0

3 years ago

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