I NEED HELP WITH NUMBER 7 I WILL GIVE U BRAINLIEST

Answer:

c

Explanation:

The complete question is :

A hot-air balloon has a volume of 2100 m3 . The balloon fabric (the envelope) weighs 860 N . The basket with gear and full propane tanks weighs 1300 N .

If the balloon can barely lift an additional 3400 N of passengers, breakfast, and champagne when the outside air density is 1.23kg/m3, what is the average density of the heated gases in the envelope?

Solution :

Given volume of the hot air balloon [tex]$=2100 \ m^3$[/tex]

The balloon fabric weights = 860 N

The weight of the basket with the gear and propane tank = 1300 N

Density of outside air [tex]$= 1.23 \ kg/m^3$[/tex]

∴  Total pay load = Weight of the air displaced - weight of gas inside the balloon

Total pay load = 860 + 1300 + 3400

                        = 5560 N

Mass = density x volume

Weight  [tex]$= \text{mass} \times g$[/tex]

Weight = volume x density [tex]$\times \text{ acceleration due to gravity (g)}$[/tex]

Weight of the displaced air = 2100 x 1.23 x 9.8

                                             = 25313 N

Weight of the gas inside the balloon = density [tex]$\times \text{ acceleration due to gravity (g)}$[/tex] x volume

                                                             = density x 9.8 x 2100

                                                             = density x 20580 N

Therefore substituting the values, we get

⇒ 25313 - (density x 20580) = 5560

⇒ density [tex]$=\frac{19753}{20580}$[/tex]

                 [tex]$= 0.96 \ kg/m^3$[/tex]

So the density of the heated gas [tex]$= 0.96 \ kg/m^3$[/tex]

Answer:

shivering raises your body temperature

Answer:

The acceleration is 5 m/s² and the distance is 562.5  m.

Explanation:

Given that,

Initial velocity of the plane, u = 0 (at rest)

Final speed, v = 75 m/s

Time, t = 15 s

We need to find the acceleration of the plane and distance it travel before takeoff.

[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{75-0}{15}\\\\a=5\ m/s^2[/tex]

Let the distance is d.

[tex]v^2-u^2=2ad\\\\d=\dfrac{v^2-u^2}{2a}\\\\d=\dfrac{(75)^2-(0)^2}{2\times 5}\\\\d=562.5\ m[/tex]

So, the acceleration is 5 m/s² and the distance is 562.5  m.

Answer:

E_total = 0

Explanation:

In this exercise we are asked for the electric field created by two charges at the midpoint between them, since the electric field is a vector magnitude it must be added as vectors. The equation that describes the electric field for a charge is

           [tex]E = k \frac{q}{r^{2} }[/tex]

in this case the two charges are positive, therefore the field is salient, in the adjoint we can see a diagram of the system

          E_total = E₁ -E₂

we calculate the electric field of charge 1 with q = + 5 10⁻³ C and a distance r = L / 2 = 100/2 = 50 m

           E₁ = [tex]\frac{9 10^{9} \ 5 10^{-3} }{ 50^{2} }[/tex]

           E₁ = 1.8 10⁴ N / C

the magnitude of the electric field of charge 2 is equal, but the sense is opposite.

Since the two charges have the same sign, the addition of vectors gives zero

           E_total = 0

if the charges were of different signs, the fields would be added

            E_total = 3.6 10⁴ N / A

Answer:

P = 24525 [Pa]

Explanation:

The pressure at the bottom of any vessel can be determined, only by knowing the depth or height of the liquid level. By means of the following equation.

[tex]P=Ro*g*h[/tex]

where:

P = pressure [Pa]

Ro = density of the water = 1000 [kg/m³]

g = gravity acceleration = 9.81 [m/s²]

h = elevation = 2.5 [m]

Now replacing:

[tex]P=1000*9.81*2.5\\P=24525 [Pa][/tex]

Answer:

which sport are you referring to?

Explanation:

Answer:

sorry I don't really know about that question.

Explanation:

Answer:

Explanation:

The iron ring to be put on the rim of a cart wheel is always of slightly smaller diameter than that of the wheel. When the iron ring is heated to become red hot, it expands and slips on to the wheel easily. When it is cooled, it contracts and grips the wheel firmly.

Explanation:

Iron rims are made slightly smaller than the wheels. They are heated red hot before fixing them on the cart wheels to expand them so that they can be easily fixed on the wheels and water is poured on them to cool them. As the rims cool they contract and take the shape of the wheel and get firmly fixed on the wheels.

So iron-rims are heated before putting them on the wheels of Bullock-carts

Hope it will help :)

Answer:

A. Asymptotic giant branch star

Explanation:

Hope this helped.

Answer:

asymptotic giant branch star

Explanation:

Plato/Edmentum

Answer:

Chemical energy into Kinetic energy

Explanation:

Answer:

its 24 hours

Explanation:

12 hours during the night and 12 hours during the day

Yes that's right...did anyone tell you something else?

Answer:

the light is reflected, because light is white when the spectrum is combined, and white reflects white. that's why wearing a white shirt outside feels cooler than wearing a black shirt, since it doesn't absorb light.

Answer:

All the light is reflected, so the shirt appears white.

Explanation:

"Wet pavement dries after a rain shower" is not an example of vaporization. The correct answer is D.

Vaporization is the process by which a liquid is converted into a gas or vapor. The two main types of vaporization are boiling and evaporation.

Here in the Question,

Option A: Bubbles form as water boils on the stove. This is an example of vaporization by boiling, which occurs when a liquid is heated to its boiling point and its vapor pressure becomes equal to the atmospheric pressure.

Option B: Water droplets form on a mirror during a shower. This is an example of vaporization by evaporation, which occurs when a liquid changes into a gas at temperatures below its boiling point. In this case, the water on the mirror evaporates due to the heat and humidity in the shower.

Option C: Air gains moisture as it moves over the ocean. This is also an example of vaporization by evaporation. The warm air over the ocean absorbs moisture from the water surface, causing the water to evaporate and form water vapor in the air.

Option D: Wet pavement dries after a rain shower. This is not an example of vaporization. The water on the pavement may evaporate due to the heat and dryness of the surrounding air, but this process does not involve a liquid changing into a gas or vapor. Rather, the water on the pavement may be absorbed by the ground, run off into nearby drainage systems, or be removed by physical means like squeegees.

Therefore, among the given options, option D is not an example of vaporization.

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Answer:

52.5 g of the salt

Explanation:

From the question given above, we were told that concentration of the mixture that is needed can be obtained as by dissolving 35 g of salt in 1000 mL of water.

Thus, we can obtain the mass of the salt needed to make 1500 mL of the salt water mixture as follow:

35 g of salt dissolves in 1000 mL of water.

Therefore, Xg of the salt will dissolve in 1500 mL of water i.e

Xg of salt = (35 × 1500)/1000

Xg of salt = 52.5 g

Thus, 52.5 g of the salt is needed to make 1500 mL of the salt water mixture.

Answer:

yes basketball is played with nine players

Answer:

Explanation:

A military jet cruising at an altitude of 12.0 km and speed of 1200 km/h burns fuel at the rate of 80.1 L/min. How would you calculate the amount of fuel the jet consumes on a 750 km mission?

In order to calculate the amount of fuel that would be consumed, first, there is a need to find the time it will take to complete the 750 km mission.

Recall that: speed = distance/time, at a speed of 1200 km/h, the time taken to cover a distance of 750 km would be;

time = distance/speed

      = 750/1200 = 0.625 h

The rate of fuel burning is 80.1 Liters in a minute, there are 60 minutes in 1 hr;

1 hr = 60 minutes

0.625 h = 0.625 x 60 = 37.5 minutes

It takes 37.5 minutes to cover 750 km and the fuel burning rate is 80.1 liters per minute, hence, the amount of fuel consumed by the jet would be;

80.1 x 37.5 = 3000 liters

Answer:

We must duplicate the length of the rope (R'=2R) to get

[tex]F'=\frac{1}{2}F[/tex]

Explanation:

The equation of the centripetal force is given by:

[tex]F_{c}=ma_{c}[/tex]

[tex]F_{c}=m\frac{v^{2}}{R}[/tex]

Where:

R is the length of the rope

m is the mass of the object

v is the speed of the object

If we want to reduce the centripetal force in half, we can duplicate the length of the rope (R'=2R), which means:

[tex]F'_{c}=m\frac{v^{2}}{R'}[/tex]

[tex]F'_{c}=m\frac{v^{2}}{2R}[/tex]

[tex]F'_{c}=\frac{1}{2}F_{c}[/tex]

I hope it helps you!

Answer:

a = 0.7267 ,  acceleration is positive therefore the speed is increasing  

Explanation:

The definition of acceleration is

         a = dv / dt

they give us the function of speed

         v = - (t-1) sin (t² / 2)

         a = - sin (t²/2) -  (t-1) cos (t²/2)  2t / 2

         a = - sin (t²/2) - t (t-1)  cos (t²/2)

the acceleration for t = 4 s

          a = - sin (4²/2) - 4 (4-1) cos (4²/2)

          a = -sin 8 - 12 cos 8

remember that the angles are in radians

          a = 0.7267

the problem does not indicate the units, but to be correct they must be m/s²

We see that the acceleration is positive therefore the speed is increasing

Answer:

9800 J

Explanation:

From the question given above, the following data were obtained:

Mass (m) = 5 kg

Height (h) = 200 m

Potential energy (PE) =?

Potential energy (PE) is the energy stored in an object by virtue of its location. Mathematically, it is expressed as:

PE = mgh

Where:

PE => is the potential energy.

m => is the mass of the object.

g => is the acceleration due to gravity.

h => is the height to which the object is located.

With the above formula, we can obtain the potential energy of the ball at its original height as follow:

Mass (m) = 5 kg

Height (h) = 200 m

Acceleration due to gravity (g) = 9.8 m/s²

Potential energy (PE) =?

PE = mgh

PE = 5 × 9.8 × 200

PE = 9800 J

Therefore, the potential energy of the ball at its original height is 9800 J

Answer:

[tex]F = 0.3\ Hz[/tex]

Explanation:

Given

See attachment for the graph

Required

Determine the frequency

Frequency (F) is calculated as:

[tex]F = \frac{1}{T}[/tex]

Where

T = Time to complete a period

From the attachment, the wave complete a cycle or period in 3 seconds..

So:

[tex]F = \frac{1}{3s}[/tex]

[tex]F = 0.333\ Hz[/tex]

[tex]F = 0.3\ Hz[/tex] --- Approximated

Answer:

0.3Hz

Explanation:

I took the test :)

Answer:

1. Letter A indicates the crest.

2. Letter E indicates the wavelength.

3. Letter C indicates the trough.

Explanation:

1. Determination of the the crest.

A crest is simply defined as a point on a wave where the displacement is maximum (i.e highest).

Considering the diagram given above, the point where the displacement is maximum is A. Therefore, A is the crest of the wave.

2. Determination of the wavelength.

The wavelength of a wave is simply defined as the distance between two successive crest or trough.

Obeserving the diagram above, we can see that E gives the distance between two successive crest. Therefore, E is the wavelength of the wave.

3. Determination of the trough.

A trough is simply defined as a point on a wave where the displacement is minimum (i.e lowest). Thus we can say that the trough is the opposite of the crest.

Considering the diagram given above, the point where the displacement is minimum is C. Therefore, C is the trough of the wave.

Answer:

hope this was good for u and I believe it would be solid

Answer:

No

Explanation:

Earthquakes cannot occur in an area with no fault and no volcanoes.

An earthquake is the sudden movement of within the earth usually along a fault surface.

Therefore, earthquakes are closely and tightly related to faults and volcanoes.

Answer:

Pitch is the correct answer!

Explanation:

~Hope this helps! :)

A matchstick has a lot of chemical energy stored in it. When the match is struck, it burns and the chemical energy in it produces heat energy and light energy.

A matchstick has a lot of substance energy set aside in it. Right when the match is struck, it consumes and the engineered energy in it produces heat energy and light energy.

Chemical energy is the energy that is released when organic compounds engage in a chemical reaction and change into other substances. Batteries, food, and gas are a few examples of chemical energy storage mediums.

The types of energy are as follows:

The energy can not be made and it can not be vanished. But it can be transform from one form to another form.

A matchstick has a ton of substance energy put away in it. At the point when the match is struck, it consumes and the synthetic energy in it produces heat energy and light energy.

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Answer:

Workdone = 113778 Joules

Explanation:

Given the following data;

Force = 903N

Distance = 126m

To find the workdone;

Workdone = force * distance

Substituting into the equation, we have

Workdone = 903 * 126

Workdone = 113778 Joules

Therefore, the amount of work, in joules, the gravity did on the asteroid is 113778.