Pls help quick too.................

Answer:

 v = 1.078 10⁴ m / s

Explanation:

To solve this exercise we can use conservation of mechanical energy

Starting point. Just clearing

          Em₀ = K + U = ½ m v² - G m M / [tex]R_{e}[/tex]

Final point. At r = 14R_{e}

        Em_{f} = U = -G m M / 14R_{e}

how energy is conserved

         Em₀ = [tex]Em_{f}[/tex]

         ½ m v² - G m M /R_{e} = -G m M / 14R_{e}

        ½ v² = G M / R_{e} (-1/14 + 1)

        v² = 2 G M / R_{e} 13/14

we calculate

       v² = 2 6.67 10⁻¹¹ 5.98 10²⁴ / 6.37 10⁶ 13/14

       v = √ (1,16 10⁸)

       v = 1.078 10⁴ m / s

The launch speed of a projectile that rises above the earth will be

v = 1.078 10⁴ m / s

Speed is defned as the movement of any object with respect to the time the formula of speed is given as the ratio of the distance with time.

To solve this exercise we can use conservation of mechanical energy

Starting point. Just clearing

[tex]E_{mo} = K + U = \dfrac{1}{2}m v^2 - \dfrac{G m M} { r}[/tex]

Final point. At[tex]r = 14R_{e}[/tex]

 [tex]Em_{f} = U = \dfrac{-G m M }{14R_{e}}[/tex]

how energy is conserved

 [tex]E_{mo }= \dfrac{1}{2} m v^2 -\dfrac{-G m M }{R_{e}} = \dfrac{-G m M }{ 14R_{e}}[/tex]

  [tex]\dfrac{1}{2} v^2 = \dfrac{G M }{ R_{e} (\dfrac{-1}{14} + 1)}[/tex]

    [tex]v^2 = \dfrac{2 G M} { R_{e} \dfrac{13}{14}}[/tex]

we calculate

[tex]v^2 = \dfrac{2 6.67 \times10^{-11}\times 5.98 \times 10^{24}} { 6.37 \times 10^{6} \times \dfrac{13}{14}}[/tex]

  [tex]v = \sqrt{ (1,16\times 10^8)}[/tex]

  v = 1.078 10⁴ m / s

Hence the launch speed of a projectile that rises above the earth will be

v = 1.078 10⁴ m / s

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Answer:

1. Photosynthesis releases oxygen gas as a product.

2. Subtracting cellular respiration from gross primary productivity

3. True

Explanation:

1. Photosynthesis is the process by which autotrophic organisms synthesize their food in form of sugars in the presence of sunlight. Photosynthetic process combines carbon dioxide (CO2) and water (H2O) to form glucose (C6H12O6) and oxygen gas as products. The equation is as follows:

6CO2 + 6H2O → C6H12O6 + 6O2

2. Net primary productivity, denoted by NPP, refers to the amount of biomass present in an ecosystem. It can be calculated by subtracting the amount of CO2 lost via cellular respiration from the amount produced called Gross primary productivity (GPP). That is;

NPP = GPP - cellular respiration

3. The process by which organic matter is synthesized from inorganic ones by organisms called AUTOTROPHS or PRIMARY PRODUCERS is called PRIMARY PRODUCTIVITY. Examples of autotrophic organisms are green plants, algae etc. Hence, in an ecosystem that have a high primary productivity, there would be a rapid rate of conversion of solar energy to biomass via PHOTOSYNTHESIS.

Answer:

Both are subject to a persons interpretation

Explanation:

We hear people describe this when somebody is making an irresistible sound. usually people say the baby has a pitch scream.

Answer:

Explanation:

D

The net force acting on the car is -1320 N. Option B is the closest force that is acting on the car.

Given that the mass m of the car is 1100 kg and its acceleration a is -1.2 m/s2. The force on the car is calculated by Newton's second law of motion.

Newton's second law states that the force on an object is equal to the products of its mass and acceleration.

[tex]F = ma[/tex]

Substituting the values, we get the force on the car.

[tex]F = 1100 \times -1.2[/tex]

[tex]F = -1320 \;\rm N[/tex]

Hence we can conclude that the net force acting on the car is -1320 N. Option B is the closest force that is acting on the car.

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Answer:

400 Hz

Explanation:

The frequency of a sound wave is found by the velocity/wavelength.  Therefore, f = v/wavelength = (200 m/s)/(0.5 m) = 400 Hz

I hope this helps! :)

Answer:

Explanation:

Sure!

Cars do it all the time. Do you mean without some sort of guidance system, or some sort of computerized brain? That's getting a little tougher. It's possible I think, if you let some sort of timer turn it on.

Answer:

Answer:

because Hydropower is fueled by water, so it's a clean fuel source, meaning it won't pollute the air like power plants that burn fossil fuels, such as coal or natural gas. Hydroelectric power is a domestic source of energy, allowing each state to produce their own energy without being reliant on international fuel sources.

Explanation:

please mark as brainlest

Answer:

I would choose refrigerator.

Explanation:

In my opinion, such a battery could be invented by changing the device as a low power mode. Plus, it is a must in order to decrease the CFC gas spreading through the atmosphere. That's all, thank you.

Answer:

Explanation:

To convert Celsius to Fahrenheit, use the following formula;

= (°C * 9/5) + 32

= (453 * 9/5) + 32

= 847.4 °F

To convert Celsius to Kelvin, use the following;

= °C + 273.15

= 453 + 273.15

= 726.15K

A)Linear motion

If there is not net force on the car, then by the Newton Second Law, the acceleration is zero, and the only valid option for zero acceleration is A).

Answer:the nucleus controls and regulates the activities of the cell

Explanation:trust me bro

Answer:

The nucleus controls and regulates the activities of the cell and carries the genes, structures that contain the hereditary information.

Answer:

which of the cars are speeding up: c

which of the cars or slowing down: a

which of the cars are maintaning a constant speed: b

Explanation:

Answer:

Explanation:

I gave a good enough explanation in your other posting. I'm sorry that I'm eating up your points.

The orange line is speeding up

The blue line is neither speeding up nor slowing down. It's speed is constant.

The green line is starting from 4 m/s and is slowing down to 0.

The diagram helps a lot. Thank you for that.

Answer:

the answer is PHOTOSYNTHESIS..

Explanation:

photosynthesis is the process when plants make their food from taking energy from the sun creating sugar.

Answer:

[tex]y = 4.36[/tex]

Explanation:

Let the height of the ladder be L

[tex]L = 10[/tex]

Also:

When the ladder leans against the wall, it forms a triangle and the length of the ladder forms the hypotenuse.

So, we have:

[tex]L^2 = x^2 + y^2[/tex] --- Pythagoras Theorem

When the base is 9ft from the wall, this means that:

[tex]x = 9[/tex]

Substitute 9 for x and 10 for L in [tex]L^2 = x^2 + y^2[/tex]

[tex]10^2 = 9^2 + y^2[/tex]

[tex]100 = 81 + y^2[/tex]

Make [tex]y^2[/tex] the subject

[tex]y^2 = 100 - 81[/tex]

[tex]y^2 = 19[/tex]

Make y the subject

[tex]y = \sqrt{19[/tex]

[tex]y = 4.36[/tex]

Hence, the true distance at that point is approximately 4.36ft

The true statement about the true distance between the top of the ladder and the ground when the base is 9 feets from the wall is - 9/√19

Let :

Ladder forms a right angle triangle as it leans against the wall :

Hence, we have :

Taking the implicit derivative of both sides:

2xdx/dt + 2ydy/dt = 0

xdx/dt + ydy/dt = 0

ydy/dt = - xdx/dt

dy/dt = (-xdx/dt) / y

When the ladder is 9 ft from the wall;

81 + y² = 100

y² = 100 - 81 = 19

y = √19

Substituting into the equation :

dy/dt = -9(1)/√19

Hence, dy/dt = - 9/√19

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Answer:

[tex]0.75623\ \text{kN/m}[/tex]

[tex]55.6\ \text{cm}[/tex]

Explanation:

m = Mass of object = 7.94 kg

g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]

x = Change in length of the spring = [tex](42.4-32.1)\ \text{cm}[/tex]

F = Force on the spring

Force of gravity on the object and the force on the spring will be equal

[tex]mg=kx\\\Rightarrow k=\dfrac{mg}{x}\\\Rightarrow k=\dfrac{7.94\times 9.81}{0.424-0.321}\\\Rightarrow k=756.23\ \text{N/m}[/tex]

The spring constant is [tex]756.23\ \text{N/m}=0.75623\ \text{kN/m}[/tex]

F = 178 N

Force on spring is given by

[tex]F=kx\\\Rightarrow x=\dfrac{F}{k}\\\Rightarrow x=\dfrac{178}{756.23}\\\Rightarrow x=0.235\ \text{m}=23.5\ \text{cm}[/tex]

The length of the spring will be [tex]32.1+23.5=55.6\ \text{cm}[/tex].

Answer:

400cos(60) = 200m/s

100(v) = 0.035(200)

v= 0.07m/s

Answer:

An atom of sodium (Na) donates one of its electrons to an atom of chlorine (Cl) in a chemical reaction, and the resulting positive ion (Na+) and negative ion (Cl−) form a stable ionic compound (sodium chloride; common table salt) based on this ionic bond.

Explanation:

All the info i can give you

Answer:

b.

Explanation:

Answer:

conduction

Explanation:

A blue "H" means a center of high pressure (usually calm, sunny weather). A red "L" means low pressure (which can mean storminess). Most fronts extend from low-pressure centers.

The weather symbol blue 'H' represents high pressure while red 'L' represents Low pressure.

Weather symbols can be described as symbols with which meteorologists indicate various atmospheric and natural conditions on special weather maps such as temperature, pressure, precipitation, wind, or the percentage of cloud coverage in the sky. These maps can be used to be paper maps or digital.

Warm fronts can be described as indicated by curved red lines with red semicircles. Cold fronts can be curved blue lines with blue triangles. Stationary fronts exhibit alternating red curves with semicircles and blue curves with triangles. There are 99 present weather symbols used in meteorology.

The eight elements observed by meteorologists for creating weather forecasts are air temperature, humidity, wind speed, wind direction, visibility, clouds, precipitation, and atmospheric pressure.

On weather maps, readings are represented as a red “L” for low pressure or a blue “H” for high pressure.

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Answer:

Explanation:

Force of friction acting on the body = μ mg cosθ

= .4  x 70 x 9.8 x cos30

= 237.63 N

component of weight = mgsinθ

= 70 x 9.8 x sin30

= 343 N  

Net upward force = 600 - mgsinθ - μ mg cosθ

= 600 - 343 - 237.63

= 105.37 N

acceleration in upward direction = 105.37 / 70

= 1.5 m /s²

s = ut + 1/2 a t²

= 0 + .5 x 1.5 x 3²

= 6.75 m .

The crate will move at a distance of 1.215 m in 3 seconds.

Given that the mass m of the crate is 70 kg and the angle above the horizontal is 30°. External force F on the crate is 600 N and the coefficient of friction is 0.4.

The friction force applied to the crate is calculated as given below.

Friction force = [tex]\mu mgcos \theta[/tex]

Where [tex]\mu[/tex] is the friction constant, g is the gravitational acceleration and [tex]\theta[/tex] is the angle above the horizontal.

Friction Force = [tex]0.4\times 70\times 9.8\times cos30^\circ[/tex]

Friction force = 237.63 N.

There is a force applied on the crate due to its weight is calculated as given below.

Force (weight component) = [tex]mgsin\theta[/tex]

Force (weight component) = [tex]70\times 9.8\times sin 30^\circ[/tex]

Force (weight component) = 343 N.

The net force applied to the crate is given below.

Net force = External force - friction force - force (weight component)

Net force F' = [tex]600 - 237.63 - 343[/tex]

Net force F' = 19.37 N.

The acceleration of the crate can be calculated as given below.

[tex]a = \dfrac {F'}{m}[/tex]

[tex]a =\dfrac {19.37}{70}[/tex]

[tex]a = 0.27 \;\rm m/s^2[/tex]

Hence the distance traveled by the crate in 3 seconds is calculated by the formula given below.

[tex]s = ut + \dfrac {1}{2} at^2[/tex]

Where, s is the distance, u is the initial velocity, a is the acceleration and t is the time of motion of the crate.

[tex]s = 0\times 3 + \dfrac {1}{2} \times 0.27 \times 3^2[/tex]

[tex]s = 1.215[/tex]

Hence we can conclude that the crate will move a distance of 1.215 m in 3 seconds.

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Answer:

The mass of first body is double, since mass is double.

This is due to momentum

The same net force is applied to two bodies. The first body acquires half of the acceleration of the second body. The mass of first body is double, since mass is double.

In Newtonian physics, an object's mass and velocity are combined to form momentum, more precisely linear momentum and translational momentum. It has both a magnitude as well as a trajectory, making it a vector quantity. If an item has a mass of m and a velocity of v (also a vector quantity).

The kilogram metre per second (kg m/s), or newton-second inside the International System of Units (SI), is the unit used to measure momentum. The same net force is applied to two bodies. The first body acquires half of the acceleration of the second body. The mass of first body is double, since mass is double.

Therefore, the mass of first body is double, since mass is double.

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Answer:

because the cohesive forces within the drops are stronger than the adhesive forces between the drops and the wax. Water wets glass and spreads out on it because the adhesive forces between the liquid and the glass are stronger than the cohesive forces within the water.

Answer:

the adhesive forces between the drops are stronger than cohesive force between the liquid

The box is accelerated from rest to 4 m/s in a matter of 2.5 s, so its acceleration a is such that

4 m/s = a (2.5 s)   →   a = (4 m/s) / (2.5 s) = 1.6 m/s²

Then the force applied to the box has a magnitude F such that

F = (10 kg) (1.6 m/s²) = 16 N

Answer:

875.59 N/m

Explanation:

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

Force (F) = 10 lb

Extention (e) = 2 in

Spring constant (K) =?

Next, we shall convert 10 lb to Newton (N). This can be obtained as follow:

1 lb = 4.448 N

Therefore,

10 lb = 10 lb × 4.448 N / 1 lb

10 lb = 44.48 N

Thus, 10 lb is equivalent to 44.48 N

Next, we shall convert 2 in to metre (m). This can be obtained as follow:

1 in = 0.0254 m

Therefore,

2 in = 2 in × 0.0254 m / 1 in

2 in = 0.0508 m

Thus, 2 in is equivalent to 0.0508 m.

Finally, we shall determine the spring constant i.e the stiffness of the spring as follow:

Force (F) = 44.48 N

Extention (e) = 0.0508 m.

Spring constant (K) =?

F = Ke

44.48 = K × 0.0508

Divide both side by 0.0508

K = 44.48 / 0.0508

K = 875.59 N/m

Therefore the spring constant i.e the stiffness of the spring is 875.59 N/m

Answer:

Conservation of momentum

Explanation:

Out of the two options given, the more appropriate one is the law of conservation of momentum. This is particularly so because momentum deals with the velocity or speed of the car while considering its mass. So, if a large car is to collide with another car, small one, then the momentum is what is considered. Energy on the other hand is talking about the work that is done, while the momentum considers the mass of the car while it is moving and considering its speed also

Answer:

[tex]R=519.61N[/tex]

Explanation:

From the question we are told that

Tension T on a cable are T=300N

Generally the tensions on a pulley is

       [tex]\sum f_x=T+T*cos(\theta)[/tex]

Therefore

      [tex]\sum f_x=300+300*cos(60)[/tex]

      [tex]\sum f_x=300 *1.5[/tex]

      [tex]\sum f_x=450N[/tex]

Hence

      [tex]T*sin(60) = 259.81N[/tex]

     [tex]R= 450\=i +259.81\=i[/tex]

     [tex]R=\sqrt{450^2+259.8^2}[/tex]

     [tex]R=519.61N[/tex]

Answer:

9.807 m/s²

Explanation:

PLS make me brainliest

Answer:

[tex]\huge\boxed{\sf 9.8 \ m/s^2}[/tex]

Explanation:

The acceleration due to gravity is g the value of which is 9.8 m/s².

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

The angle from vertical of the axis of the second polarizing filter is 50.57⁰.

Explanation:

Given;

intensity of the unpolarized light, I₀ = 300 W/m²

intensity of emergent polarized light, I = 121 W/m²

let the angle from vertical of the axis of the second polarizing filter = θ

Apply Malus's law, intensity of emergent polarized light is given as;

I = I₀Cos²θ

[tex]Cos^2 \theta = \frac{I}{I_o} \\\\Cos^2 \theta =\frac{121}{300} \\\\Cos^2 \theta =0.4033\\\\Cos \theta = \sqrt{0.4033} \\\\Cos \theta = 0.6351\\\\\theta = Cos^{-1} (0.6351)\\\\\theta = 50.57 ^0[/tex]

Therefore, the angle from vertical of the axis of the second polarizing filter is 50.57⁰.