Use Newton's second law of motion and a free-body diagram to...
1. ...calculate the normal force acting upon a 50-kg passenger who accelerates upward at a rate of 3.0 m/s/s.
2. ...calculate the normal force acting upon a 50-kg passenger who accelerates downward at a rate of 3.0 m/s/s.
Please don't put any links or I will report you.

Answer:

The spring constant will be "1333.33 N/m".

Explanation:

The given values are:

Mass,

m = 1.2 kg

Displacement compression,

x = 0.15 m

Block's velocity,

[tex]v_i=5 \ m/s[/tex]

As we know,

⇒  [tex]E_i=E_f[/tex]

or,

⇒  [tex]K_i+v_i=K_f+v_f[/tex]

⇒  [tex]\frac{1}{2}mv_i^2+0=0+ \frac{1}{2}Kx^2[/tex]

So,

⇒  [tex]K=\frac{mv_i^2}{x_2}[/tex]

On substituting the values, we get

⇒       [tex]=\frac{1.2\times 5\times 5}{0.15\times 0.15}[/tex]

⇒       [tex]=\frac{30}{0.0225}[/tex]

⇒       [tex]=1333.33 \ N/m[/tex]

Answer:

B

Explanation:

Answer:

Find the letter below.

Explanation:

                                                                                1237 Richmond Avenue,

                                                                                Houston, Texas,

                                                                                U.S.A.

                                                                                3rd May, 2021.

The Principal,

Carnegie Vanguard High School,

Houston, Texas,

U.S.A.

Dear Sir,

           APPRECIATION FOR THE ADMISSION OFFER IN YOUR SCHOOL

          I humbly write this letter to express my sincere appreciation for the offer of admission in your highly esteemed institution of learning. The admission letter states that I was admitted to pursue a programme in Computer Science and this is a source of great delight for me. The opportunity is a unique one because I stand a great chance of acquiring deeper knowledge of programming software that will prove invaluable to me in my future career.  

         Over the years, I have been particularly thrilled with all the inventions that have been made possible with information technology and programming of many useful software. These inventions have made life a lot easier, hence my interest in getting the required knowledge that will enable me to contribute my quota to the society.

         This programme will also afford me the opportunity to relate with seasoned professionals in the field of Information Technology. When in contact with these professionals, I hope to ask them several questions on programming, the technicalities involved in it, and what is obtainable in the real-world scenario. Armed with these pieces of information, I believe that the programme will shape me to be an excellent professional that will be useful to the society.

         Once again, thank you for this very special opportunity. I hope to fully maximize the privilege.

Yours Sincerely,

Jessica Liam.

Answer:

Option C, The 30 m telescope can observe objects 9 times fainter, and with 3 times smaller angular size, than the 10 m telescope.

Explanation:

As we know,

The surface brightness of the object viewed through telescope is proportional to the square of the diameter of the lens

Thus, Brightness ([tex]B_{30}[/tex]) of 30 m telescope would be proportional to [tex]30^2[/tex]

Brightness of 10 m ([tex]B_{10}[/tex]} telescope would be proportional to [tex]10^2[/tex]

Thus, the ration of the two would be

[tex]\frac{B_{30}}{B_{10}} = \frac{30^2}{10^2} \\\frac{B_{30}}{B_{10}} = \frac{9}{1} \\B_{30} = 9 * B_{10}[/tex]

Thus, brightness of 30 m telescope would be able to view 9 times fainter object as compared to the 10 m telescope.

Also , 30 m telescope would be able to view 3 times smaller angular sized object as compared to the 10 m telescope

Hence, option C is correct

Answer:

The thickness of the film is = 3.183e-9m

Explanation:

It will help us if we understand that the shape of the circular film can be approximated to be a cylinder. The height of this cylinder, or its thickness, in this case, will be very small.

Since we can approximate the shape of the drop of oil to be a cylinder, after it has spread out on the surface of the water, we can use the cylindrical geometric formulas to find out how thick the film is.

The volume of a cylinder = [tex]\pi r^2 h[/tex]

our radius is given as [tex]10^{-1}m = 0.1m[/tex]

the volume is [tex]10 ^{-10} m^3=1e-10m^3[/tex]

Remember that our task is to find the height of the cylinder. We can do this by making the height the subject of the formula.

[tex]h = \frac{Volume}{\pi r^2} = \\\\\frac{1e-10}{\pi \times 0.1^2} = 3.183e-9m[/tex]

Therefore, the thickness of the film is = 3.183e-9m

Answer:

Will start to decrease until it reaches the room temperature where it transforms from solid to liquid as the bonds are weakening and thus water has a low melting point also known as h20

Explanation:

Answer: Natural selection is taking place.

Explanation:

As you can see, the lighter colored mice are more visible than their surroundings, so the hawk picks them off one by one. the brown mice on the other hand are less visible, blending in with their surroundings, so they are successful, and pass on the genes that allow them to survive better.

- anonymous

In the first picture, the mice are in the environment looking for resources necessary for their survival. In the second picture, mice are being hunted by a predator. In the third figure, the rat population decreased as the light rats died and the dark rats survived.

The three figures represent a process called Natural Selection.

In the figures, we can see that there is a community of dark and light mice. Dark mice are more adapted to the environment, as they can camouflage themselves more easily.

This camouflage allows the dark mice to evade predators more efficiently. On the other hand, light mice are easily noticed by predators and for this reason, they are quickly devoured.

This causes the number of light mice to decrease to the point where they cease to exist. Meanwhile, the dark mice survive and pass this trait on to their descendants.

More information about natural selection at the link:

https://brainly.com/question/2725702

Answer:

13 N

Explanation:

From the question,

(F₁+F₂)-F' = ma................ Equation 1

Where F₁= Jack's force, F₂ = Jill's force, F' = Friction force, m = mass of the object, a = acceleration of the object.

Given: F₂ = 4 N, F' = 2 N, m = 3 kg, a = 5 m/s²

Substitute these values into equation 1 and solve for F₁

(F₁+4)-2 = 3×5

(F₁+4)-2 = 15

F₁+4 = 15+2

F₁+4 = 17

F₁ = 17-4

F₁ = 13 N

Hence the force applied by Jack is 13 N

Answer:

Option D. 0.061 J

Explanation:

We'll begin by converting 5 cm to m. This can be obtained as follow:

100 cm = 1 m

Therefore,

5 cm = 5 cm × 1 m / 100 cm

5 cm = 0.05 m

Next, we shall convert 250 g to Kg. This can be obtained as follow:

1000 g = 1 Kg

Therefore,

250 g = 250 × 1 Kg / 1000

250 g = 0.25 Kg

Next, we shall determine the weight of the object. This can be obtained as follow:

Mass (m) = 0.25 Kg

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

Weight (W) =?

W = m × g

W = 0.25 × 9.8

W = 2.45 N

Next, we shall determine the spring constant. This can be obtained as follow:

Compression (e) = 0.05 m

Weight = Force (F) = 2.45 N

Spring constant (K) =?

F = Ke

2.45 = K × 0.05

Divide both side by 0.05

K = 2.45 / 0.05

K = 49 N/m

Finally, we shall determine the potential energy contained in the compressed spring. This can be obtained as follow:

Compression (e) = 0.05 m

Spring constant (K) = 49 N/m

Energy (E) =?

E = ½Ke²

E = ½ × 49 × (0.05)²

E = 24.5 × 0.0025

E = 0.061 J

Therefore, the potential energy contained in the compressed spring is 0.061 J

Answer:

106.4V

Explanation:

Voltage = resistance * current

Answer:

14.4

Explanation:

distance / time

so

72/5

14.4

Answer:

you are right

Explanation:

Answer:20 g/cm.

Explanation:

Answer:4g/cm3.

Explanation: The Density of a substance or object  is the mass of the substance per unit  volume of the object.

M is mass, =100g

V is volume = 25cm3

Answer:

b

Explanation:

Answer:

And the same can be said of a pendulum vibrating about a fixed position or of a guitar ... along the time axis, it is possible to determine the time for one complete cycle. ... It takes 2.3 seconds to complete the first full cycle of vibration. ... Since the standard metric unit of time is the second, frequency has units of cycles/second.

Explanation:

Plz mark brainliest im only 12. and i have never been marked brainliest.

Answer:

Explanation:

Amplitude does not affect wavelength. It also does not affect wave speed. Amplitude is the energy of the wave measured from the rest position to the top of the crest.

Hope this Helped!!!

Answer:

False

Explanation:

Amplitude does not affect wavelength. It also does not affect wave speed.

Amplitude is the energy of the wave measured from the rest position to the top of the crest. A wave with more energy has a higher up crest/ higher amplitude.

Answer:

D

Explanation:

the 3 products of photosynthesis are glucose (sugar), oxygen and water. D just doesn't include water.

Answer:

It would be C

Explanation:

plants convert carbon dioxide from the air into oxygen.

Answer:

Explanation:

This is one-dimensional motion on an incline which makes it so much more funner :/

The equation for this is

w*sinθ - f = ma which is just a fancy version of Newton's second law that says that the sum of the forces acting on an object are equal to that object's mass times its acceleration.

w is the weight of the teen which is also the normal force, [tex]F_n[/tex]. Therefore,

[tex]w=F_n=mg[/tex] where m is mass and g is gravity:

[tex]w=F_n=(74.2)(9.8)[/tex] and we need 2 sig figs for this since there are 2 in 9.8:

w = 730N

Since there is no friction in this problem, the value for f, frictional force, is 0, making our job a bit shorter. Filling in the main equation:

730sin38 - 0 = 74.2a

Since the left side is subtraction and we will eventually have to divide, and the rules for subtraction/addition are different from those for multiplication/division, we will have to subtract first, get the correct number of sig figs for that difference, and then divide, following the rules for division.

730sin38 will have 2 sig figs which is 450. Now

450 - 0 = 74.2a and

450 = 74.2a and divide to 2 sig figs:

a = 6.1 m/s/s

Answer:

    #_photons = 30 photons / s

Explanation:

Let's start by finding the energy of a photon of light, let's use the Planck relation

         E = h f

the speed of light is related to wavelength and frequency

         c = λ f

we substitute

         E = h c /λ

         E₀ = 6.63 10⁻³⁴ 3 10⁸/500 10⁻⁹

         E₀ = 3.978 10⁻¹⁹ J

now let's use a direct proportion rule. If the energy of a photon is Eo, how many fornes has an energy E = 1.2 10⁻¹⁷ J in a second

          #_photons = 1 photon   (E / Eo)

          #_photons = 1  1.2 10⁻¹⁷ /3.978 10⁻¹⁹

          #_photons = 3.0 10¹

          #_photons = 30 photons / s

Answer:

I think the answer is C but I'm probably wrong.

According to Coloum's law, when two charged eggs are brought closer, the magnitude of the electrostatic force between the eggs increases, and they attract each other. Hence, option D is correct.

Coloumb's law equals the magnitude of charges and distance of charges. It gives force of attraction or repulsion between the charged bodies. Like charges repel each other and unlike charges attract each other.

Coloumb's law states that the force of attraction or repulsion between charged bodies is directly proportional to the product of charges and inversely proportional to the square of distance between them.

The force of attraction or repulsion is given by,F = q₁×q₂ / r². q₁,q₂ is the product of charges and r is the distance of seperation of charges. The force decreases with increase of distance as distance and force are inversely proportional to each other.

From the given, two metal egg is given, one is with positive and other is negatively charged metal egg. When two metal eggs are brought closer, they attract each other as the metal eggs are oppositively charged.

When two oppositvely charged metals are brought closer, the distance of seperation of two metal eggs decreased. When distance of seperation decreases, electrostatic force increases.

Hence, as the metal eggs come closer to each other without touching the distance decreases with increase of electrostatic force and they are unlike charges, thus they attract each other. Hence, the correct option is D.

Learn more about Coloumb's law:

https://brainly.com/question/21083799

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Answer: longitudinal wave in which the particles of the wave move in a direction parallel to the wave motion

The sound wave is a longitudinal wave in which the particles of the wave move in a direction parallel to the wave motion.

A sound wave can be described as the pattern of distribution caused by the movement of energy that is traveling through a medium, such as air, water, or any liquid or solid matter, etc, as it is traveling away from the source of the sound. There are two types of sound waves:

Longitudinal wave: When the particles of the medium move in a direction parallel to the direction that the wave moves then the wave is known as the longitudinal wave.

Transverse Wave: When the particles of the medium move in a direction perpendicular to the direction that the wave moves then the wave are known as the transverse wave.

As it is given that the sound wave formed by the speaker travels through the air to your ear as a series of compressions and rarefactions of air molecules, therefore, the particles of the medium move in a direction parallel to the direction that the wave.

Hence, the sound wave is a longitudinal wave in which the particles of the wave move in a direction parallel to the wave motion.

Learn more about Sound Wave:

https://brainly.com/question/11797560

Answer:

16 miles

Explanation:

112 miles/ 7 hours= 16 miles per hour

Answer:

b mate im pretty sure ig :)

Answer:

You add up all the individual resistances of the resistors in the series circuit to get the total resistance of the circuit

Explanation:

A series circuit is a circuit that has most of its components connected end-to-end

following what was stated above, in a series circuit, the resistors are connected end to end. This means that the current that flows out from one of the resistors flows into the next one. As a result of this, the current through all the resistors is the same.

To get the total equivalent resistance in a series circuit, you add up all the individual resistances of the resistors in the series circuit. This should give you the total resistance in the circuit.

i.e

Total resistance = R1 + R2 + R3 ....

Answer:

Im only 12 and i need the points so ima try my best.

Explanation:

574.780616 m6 kg3 s-6 K-3 mol-3

Answer:

ummmmmmmmmmmm ask your teacher or perant for help

Explanation:

so umm ask an adult or teen figure and maybe you will get it write not sure do

Answer:Earth has more mass than the car.

in the question

Answer:

that one i know only pe not that sorry again

Answer:

1.12

Explanation:

it is correct on Acellus

The total force on charge q(3) is 1125 x [tex]10^{-3}[/tex] Newton

We have three charges in a straight line.

We have to find the force on charge q3 due to charge q1 and q2.

The force between two point charges is directly proportional to the product of the magnitude of two point charges and inversely proportional to the square of the distance between them. Mathematically-

[tex]F = \frac{1}{4\pi\epsilon_{o}}{\frac{qQ}{r^{2} } } }[/tex]

We have -

[tex]q_{1} =q_{2} =q_{3} = -5 \times 10^{-6} C[/tex]

The distance between -

[tex]q_{1}\;and\;q_{2} = q_{2} \;and\;q{3}[/tex] = 0.5 m

Now, Force on charge q(3) due to charge q(1) -

F(1 → 3) = [tex]\frac{1}{4\pi\epsilon_{o}}{\frac{5\times 10^{-6} \times 5\times 10^{-6} }{1^{2} } } } = 9\times 10^{9} \times 25 \times 10^{-12} = 225\times 10^{-3}[/tex] N (repelling force)

Force on charge q(3) due to charge q(2) can be calculate similarly as -

F(2 → 3) = 900 x [tex]10^{-3}[/tex] N(repelling force)

Now, both the forces are in same direction, so we can add them algebraically -

[tex]F_{net}[/tex] = F(1 → 3) + F(2 → 3) = 1125 x [tex]10^{-3}[/tex] N

Hence, the total force on charge q(3) is 1125 x [tex]10^{-3}[/tex] Newton

Hence, the wavelength of light in nano meters is 0.0177 x   nm.

To solve more questions on Coulomb's law, visit the link below -

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