What’s the power if a student does 2240j of work for 2.8 seconds

Answer:

it should be 1.8

The shift in the frequency of hydrogen line is 1.65 x 10¹² Hz.

The relationship between frequency and speed of wave is given in the following formula;

v = fλ

[tex]\frac{c}{c_o} = \frac{71.6 \times 10^5}{3 \times 10^8} = 0.00239[/tex]

The shift in the frequency of hydrogen line is calculated as follows;

[tex]0.00239 \times 6.91 \times 10^{14} = 1.65 \times 10^{12} \ Hz[/tex]

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Answer:

electromagnetic radiation

Hope this helps :)

Explanation: The mantle is divided into several layers: the upper mantle, the transition zone, the lower mantle, and D” (D double-prime), the strange region where the mantle meets the outer core. The upper mantle extends from the crust to a depth of about 410 kilometers (255 miles).

Answer:

B)

translucent

Hope this helps♡♡♡

Take "to the right" to be the positive direction. By conservation of momentum,

m₁v₁ + m₂v₂ = m₁(v')₁ + m₂(v')₂

where the v-s denote initial velocities and the v'-s denote final velocities. m₁ and m₂ are of course masses, but we're told that m₁ = m₂, so we can eliminate these factors altogether:

v₁ + v₂ = (v')₁ + (v')₂

We're given that v₁ = +4.0 m/s, (v₁)' = -1.5 m/s, and (v')₂ = +4.0 m/s.

Solve for v₂ :

v₁ + v₂ = (v')₁ + (v')₂

4.0 m/s + v₂ = -1.5 m/s + 4.0 m/s

⇒   v₂ = -1.5 m/s

Answer:

C

Explanation:

Basically force is given by the formula.

F= ma

Where m is mass of the body and 'a' is acceleration.

Here the time is not given, hence it is not possible to calculate acceleration, as acceleration is given by the formula

a= v/t

So most probably the question is wrong.

However if we take acceleration= 2m/s^2

Then F= ma= 50*2= 100N

However if the question was to find energy then it is sufficient to find kinetic energy as moving objects possess kinetic energy.kinetic energy is given by the formula:

KE= 1/2*m* v^2

I.e, KE= 1/2 * 50 * 2* 2

We have that Gravity a force acting down ward against any object and frictional force is a force acting a against  movement, Hence

Generally, Gravity a force acting down ward against any object on earth at an acceleration of about  9.8m/s

and frictional force is a force acting a against the movement based on contact with another surface

Therefore

Gravity is a field force acting downward on the couch:

This is True

Friction from the carpeted floor is a contact force acting against your push.

This is True

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Answer:

500 Pascals or 500N/m²

Explanation:

Pressure = Force/Area

P= 200/0.4 = 500

Answer:

10kj should be the answer so I think

Answer:

In continuum mechanics, stress is a physical quantity that expresses the internal forces that neighboring particles of a continuous material exert on each other, while strain is the measure of the deformation of the material.

Strain energy density functions (W) establish the relation between the amount of energy employed to deform a volume unit of a solid and imposed strain.

Explanation:

Stress, strain and strain-energy density is discussed below.

In physics and materials science, elasticity is the ability of a body to resist a distorting influence and to return to its original size and shape when that influence or force is removed

Given is to define stress and strain and establish the relation among energy, density stress and strain.

        [tex]$u = U/V =\int\limits^\epsilon_0 \, \sigma_{x} d\epsilon_{x}[/tex]

Therefore, stress, strain and strain-energy density is discussed above.

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Answer:

22/2 = 11

Explanation:

A quotient means the result of a division problem. When it says the quotient of a and b, this means of "a divided by b". Remember to always go in the right order, because in division, order matters.

Therefore the quotient of 22 and 2 is equal to 11 is written: 22/2 = 11

Answer:

9.86m/s

Explanation:

let's get to the formula

kinetic energy = 1/2*m*v^2= .5*1140*(13.6)^2=105427.2 j

it looses 50k j of energy. so new energy = 105427.2-50000 = 554227.2

again use the formula for k.e

ans = 9.86 m/s

Answer:

Warm colours are those with a yellow-ish or black undertone. Imagine how everything looks through your tinted sunglasses or on a beautiful day in autumn when the leaves are falling. The hints of yellow give these colours a sunny warmth, while those with more black mixed in appear darker and can seem more muted.

So, the force of gravity that the asteroid and the planet have on each other approximately [tex] \boxed{\sf{2.9 \times 10^{17} \: N}} [/tex]

Hi ! Now, I will help to discuss about the gravitational force between two objects. The force of gravity is not affected by the radius of an object, but radius between two object. Moreover, if the object is a planet, the radius of the planet is only to calculate the "gravitational acceleration" on the planet itself,does not determine the gravitational force between the two planets. For the gravitational force between two objects, it can be calculated using the following formula :

[tex] \boxed{\sf{\bold{F = G \times \frac{m_1 \times m_2}{r^2}}}} [/tex]

With the following condition :

We know that :

What was asked :

Step by step :

[tex] \sf{F = G \times \frac{m_X \times m_Y}{r^2}} [/tex]

[tex] \sf{F = 6.67 \cdot 10^{-11} \times \frac{1.55 \cdot 10^{22} \cdot 3.95 \times 10^{28}}{(3.75 \times 10^{11})^2}} [/tex]

[tex] \sf{F \approx \frac{40.84 \times 10^{-11 + 22 + 28}}{14.0625 \times 10^{22}}} [/tex]

[tex] \sf{F \approx 2.9 \times 10^{39 - 22}} [/tex]

[tex] \sf{F \approx 2.9 \times 10^{17} \: N} [/tex]

So, the force of gravity that the asteroid and the planet have on each other approximately

[tex] \boxed{\sf{2.9 \times 10^{17} \: N}} [/tex]

Answer:

this kind of force is proportional directly to the speed of the object and inversely to the radius of the curved path. Therefore, Hence, the force becomes 2.25 times the original force.

Explanation:

Answer:

vector quantities are resolved into their component form (along the x and y-axis) before adding them. Let us assume that two vectors are

→

a

=

x

1

^

i

+

y

1

^

j

and

→

b

=

x

2

^

i

+

y

2

^

j

, we can find the sum of two vectors as follows.

→

a

+

→

b

=

x

1

^

i

+

y

1

^

j

+

x

2

^

i

+

y

2

^

j

=

(

x

1

+

x

2

)

^

i

+

(

y

1

+

y

2

)

^

j

The direction of the sum of the vectors (with positive x-axis) is,

θ

=

tan

−

1

(

y

1

+

y

2

x

1

+

x

2

)

Out of all the largest x component is of Vector C of value 150i and Vector B will have highest y component of value 173j

Vectors are objects which have both, magnitude and direction. Magnitude defines the size of the vector. It is represented by a line with an arrow, where the length of the line is the magnitude of the vector and the arrow shows the direction.

Vector A = direction is in y direction = 100j

Since , this vector is only in y direction and have no component in x direction , so its x component will be = 0i

Vector B = direction is at angle of 60.0 degrees above the +x axis  

Resolving into x and y components

x component = Vector B*cos(60) = Vector B * (1/2) = Vector B /2 = 200 /2

                                                                                                           = 100i

y component = Vector B * sin(60) = Vector B  * [tex]\sqrt{3}[/tex]/2  = 173j

Vector C = direction is along the +x axis

hence , it will not have any y component

x component = 150i

y component = 0j

Out of all the largest x component is of Vector C of value 150i and Vector B will have highest y component of value 173j

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Answer:

[tex]a=\frac{F}{m}[/tex]

Explanation:

Just divide mass from both sides

Answer:

5seconds

Explanation:

because she was going through the same time

Answer:

290 Hz

Explanation:

Resonance, in terms of physics and biology, describes the pitch and the vocals. The frequency of the first formant is 0.30 m.

Resonance has been the production of the phonation or the vocal that gets increased in intensity and timbre by the cavities that are filled out by the air as present in the vocal system with an open-closed tube.

From the graph, the frequency of the individual line is, calculated by dividing 1000 Hz with 7 sections shown in the graph as,

f = 1000 ÷ 7

= 142.85 Hz

Further, the frequency of the first formant is calculated as:

f' = 2f

= 2(142.85 Hz)

= 285.71 Hz

= 290 Hz

Now for the open-closed tube, the fundamental frequency is,

f = ν ÷ 4L

L = ν ÷ 4f

= 343 ÷ 4( 290 Hz)

= 0.30 m

Therefore, 0.30 m is the frequency of the first formant.

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The displacement of this train is equal to 2.2 meters.

Given the following data:

To determine the displacement of a train:

Mathematically, the displacement of an object is given by this formula:

[tex]d = \frac{V\;+\;U}{t}[/tex]

Where:  

Substituting the given parameters into the formula, we have;

[tex]d = \frac{33\;+\;11}{20}\\\\d = \frac{44}{20}[/tex]

d = 2.2 meters.

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Hi there!

Recall the following:

[tex]V \text{ (Electric Potential Energy) } = \frac{kq_1q_2}{r}\\\\F_E = \frac{kq_1q_2}{r^2}[/tex]

k = Coulomb's Constant (Jm/C²)

q = Charge (C)
r = distance between charges (m)

To calculate the electric force between the two charges, we can simply divide by another 'r' (distance):

[tex]F_E = \frac{70}{0.049} = \boxed{1428.57 \mu J}[/tex]

Answer:

i think the correct answer is (a)

Answer:

B

absorption

black colour absorbs colour

Answer:

I think it's absorption

Hope this helps ;)

Answer:

The change in the mass of box = 0.01 kg

Volume of air in the polythene bag = Volume of air in the rigid box

Therefore, Volume of air in the box = 0.008 m^3

Now, Density = Mass/ Volume

=> Density = 0.01 / 0.008 = 1.25 Kg / m^3

Explanation:

I looked it up

The current through each resistor in the circuit connection is non-zero.

Grounding in a circuit connection implies a point of zero volt. It is achieved in an electrical system when a part of current flow in the circuit is intentionally directed or connected to the earth.

As long as there is potential difference in a circuit, current will flow in the resistor. Grounding a circuit creates a potential difference between two points (low potential and high potential) in the circuit and consequently, current will flow across the resistors.

Thus, the current through each resistor is non-zero.

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The acceleration and velocity of the plane is 78.57 m/s² and 157.14 m/s respectively

To calculate the acceleration of the plane, we use the formula below.

Where:

From the question,

Given:

Substitute these values into equation 1

To calculate the velocity, we use the formula below.

Where:

From the question,

Given:

Substitute these values into equation 2

Hence, The acceleration and velocity of the plane is 78.57 m/s² and 157.14 m/s respectively.
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Answer:

Brainliest pls

Explanation:

the playing of musical tones together in chords. 2: a pleasing arrangement of parts a harmony of colors. 3: agreement sense 1, accord The committee worked in harmony.

agreement; accord; harmonious relations. a consistent, orderly, or pleasing arrangement of parts; congruity. Music. any simultaneous combination of tones. the simultaneous combination of tones, especially when blended into chords pleasing to the ear; chordal structure, as distinguished from melody and rhythm.

What is harmony? What is the meaning of it.