please help..!

How many photons does it emit in 1 sec. Lamp with a power of 90 W, if it emits monochromatic light with
wavelength 600 nm?

Hello. You forgot to put the image that shows information needed to answer that question. The image is attached below:

Answer:

The cuboid and the cube exert the same pressure on the floor.

Explanation:

To answer this question, we must first consider that the area of the cuboid is equal to 24cm^2, while the area of the cube is equal to 16cm^2.

With that, we must calculate the pressure that each exerts, with the formula:

P = F / A

Cuboid: P = 60 / 0.0024 = 25000 N/m^2

Cube: P = 40 / 0.0016 = 25000 N/m^2

Answer:

Check Explanation

Explanation:

Pressure applied on a surface is defined as the force applied divided by the perpendicular cross sectional Area to the applied force

Pressure exerted by the cuboid = (weight of the cuboid)/(surface Area of the base of the cuboid touching the ground)

Weight of the cuboid = 60 N

surface Area of the base of the cuboid touching the ground = A(cuboid)

P(cuboid) = [60/A(cuboid)]

Pressure exerted by the cube = (weight of the cube)/(surface Area of the base of the cube touching the ground)

Weight of the cube = 40 N

surface Area of the base of the cube touching the ground = A(cube)

P(cube) = [40 ÷ A(cube)]

So, the diagram for the two structures, a cube and a cuboid is still missing from the internet, without this diagram and the surface area of their bases, we cannot truly tell which structure is undergoing which pressure. So, what I've done will make it very much simpler if all the diagrams are beyond.

P(cuboid) = [60/A(cuboid)]

P(cube) = [40/A(cube)]

Plugging in the surface areas, esp when their surface areas would be known wicked.

That way, the pressure appears so, you will go!!!

Hope this Helps!!!

Answer:

nicotine

Explanation:

Answer:

a

Explanation:

i took the test

Five workers from the same factory developed angiosarcoma, a rare cancer of the veins and arteries. This is observation of the scientific method.

Since at least the 17th century, the scientific method—an empirical approach to learning—has guided the advancement of science. Since one's interpretation of the observation may be distorted by cognitive presumptions, it requires careful observation and the application of severe skepticism regarding what is observed.

It entails developing hypotheses through induction based on these observations, testing the validity of those hypotheses through experimental and measurement-based statistical testing of the inferences made from them, and then fine-tuning (or discarding) those hypotheses in light of the experimental results.

These are the guiding principles of the scientific process, as opposed to a predetermined set of steps that apply to all scientific endeavors.

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Answer:

483.6 centimeters³

Explanation:

Taking into account the definition of density, 1 pound of butter occupies 482.54 cm³.

First of all, you have to know that density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

In this case, you know:

Replacing in the definition of density:

[tex]0.94\frac{grams}{cm^{3} } =\frac{453.592 grams}{volume}[/tex]

Solving:

volume× 0.94 [tex]\frac{grams}{cm^{3} }[/tex]= 453.592 grams

[tex]volume =\frac{453.592 grams}{0.94\frac{grams}{cm^{3} }}[/tex]

volume= 482.54 cm³

Finally, 1 pound of butter occupies 482.54 cm³.

Learn more about density:

Explanation:

For 787 dreamliner airplane,

Mass, [tex]m_1=2450\ kg[/tex]

Height, [tex]h_1=11500\ m[/tex]

Potential energy of 787 dreamliner airplane is given by :

[tex]E_1=m_1gh_1\\\\E_1=2450\times 9.8\times 11500\\\\E_1=2.76\times 10^8\ J[/tex]

For a boeing 747,

Mass, [tex]m_2=3150\ kg[/tex]

Height, [tex]h_2=9000 \ m[/tex]

:

Potential energy of a boeing 747 airplane is given by

[tex]E_2=m_2gh_2\\\\E_2=3150\times 9.8\times 9000\\\\E_2=2.77\times 10^8\ J[/tex]

So, the potential energy of a boeing 747 airplane is more than the 787 dreamliner airplane.

Answer:

°F = (9/5 x °C) + 32

Explanation:

Using the upper and lower fixed point as shown in the attached photo, we can obtain the formula for converting from degrees Celsius to degrees Fahrenheit. This is illustrated below:

°C – 0/100 – 0 = °F – 32/212 –32

°C/100 = °F – 32 /180

Cross multiply

100(°F – 32) = 180 x °C

Divide both side by 100

°F – 32 = 180 x °C /100

°F – 32 = 9/5 x °C

Make °F the subject

°F = 9/5 x °C + 32

°F = (9/5 x °C) + 32.

Answer:

the first choice

Explanation:

got it right on the test. hope this helps! :)

Answer: There are seven main stores of energy: magnetic

internal (thermal)

chemical

kinetic

electrostatic

elastic potential

gravitational potential

Explanation: So you can have any of these

Answer:

B dropping a marble from the roof

Explanation:

You aren't putting force on it

Dropping a marble from a roof  does not represent a contact force.

A contact force is a force that an object can only apply to another object by physically touching it.

An illustration of contact forces is: (1) Muscular force(2) Force of friction.

In this question, Pushing an object on the floor and kicking a soccer ball across the field is example of muscular force, which is a contact force. Even a weight of a pen on a table applied force via contact. But during dropping a marble from a roof, gravitational force comes into play which is a field force - not a contact force.

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Answer:

the two objects are in thermal equilibrium

Explanation:

thermal equilibrium us the state where two bodies or objects have the same amount of temperature thus no heat conduction

Answer:

Option A = 1.

Explanation:

So, in order to solve this question we are given the Important infomation or data or parameters in the question above as;

(1). First, Both objects A and D represent fixed.

(2).  Both objects A and D are negatively-charged particles of equal magnitude.

(3). "Object B represents a fixed, positively-charged particle (equal, but opposite charge from A and D)."

(4). "Object C shows a moving, positively-charged particle."

So, our mission is to determine the arrow that would correctly show the force of attraction or repulsion on object C caused by the other two objects.

We can do that by drawing out the forces of attraction and the resultants. Therefore, CHECK THE ATTACHED FILE/PICTURE FOR THE DRAWINGS.

The forces of attraction due to objects A and B on on object C will be towards themselves. Hence, the resultant is ONE(1).

Answer:

Its actually 3

Explanation: USATESTPREP

Answer: 0.8

Explanation:

The efficiency is defined as the ratio of total imput energy that is actually utilized to the end of the device.

So if we have a total transfer of 1500j of energy, and 1200j are used to heat the thing inside the kettle, 300j are not used to the actual function of the kettle.

So the efficiency is n = 1200j/1500j = 0.8

This means that a 80% of the energy imput is actually used to heat the kettle.

Answer:

-10.8°, or 10.8° below the +x axis

Explanation:

The x component of the resultant vector is:

x = 3.14 cos(30.0°) + 2.71 cos(-60.0°)

x = 4.07

The y component of the resultant vector is:

y = 3.14 sin(30.0°) + 2.71 sin(-60.0°)

y = -0.777

Therefore, the angle between the resultant vector and the +x axis is:

θ = atan(y / x)

θ = atan(-0.777 / 4.07)

θ = -10.8°

The angle is -10.8°, or 10.8° below the +x axis.

Answer:

f ’= 97.0 Hz

Explanation:

This is an exercise of the doppler effect use the frequency change due to the relative movement of the fort and the observer

in this case the source is the police cases that go to vs = 160 km / h

and the observer is vo = 120 km / h

the relationship of the doppler effect is

          f ’= f₀ (v + v₀ / v- [tex]v_{s}[/tex])

let's reduce the magnitude to the SI system

            v_{s} = 160 km / h (1000 m / 1km) (1h / 3600s) = 44.44 m / s

            v₀ = 120 km / h (1000m / 1km) (1h / 3600s) = 33.33 m / s

we substitute in the equation of the Doppler effect

          f ‘= 100 (330+ 33.33 / 330-44.44)

          f ’= 97.0 Hz

Answer:

Voltage V = 117.65 volts

the voltage across the light bulb's filament is 117.65 V

Explanation:

The power of a light bulb can be expressed with respect to voltage and current flow.

Power = voltage × current

P = VI

Making Voltage V the subject of formula;

V = P/I

Given;

Power P = 4.0W

Current I = 0.034A

Substituting the given values;

V = 4/0.034

V = 117.65 volts

Answer:

Current

Explanation:

Convection is the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat. Simply put, Convection is the circular motion that happens when warmer air or liquid — which has faster moving molecules, making it less dense — rises, while the cooler air or liquid drops down.

An everyday example of convection is boiling water ; The heat passes from the burner into the pot, heating the water at the bottom. The water at the bottom rises and is replaced by the water at the top of the pot.

This rise of less dense water at a higher temperature and fall of denser water at a lower temperature sets up a convention current circularly until the water boils. This is a typical example of the day to day application of convection currents.

The statemengt is false. Electromgnetic waves do not require a medium to transfer energy. They can transfer energy through vacuum (empty space with nothing in it). If electrimagnetic waves needed a medium to move through from place to place, then we could never see the sun, and also it would get very cold here.

Answer:

The dog's mass is 15.3kg.

Explanation:

Given that the formula for kinetic energy is k.e = 1/2×m×v² where m represents mass and v is the velocity. Then, you have to substitute the following values into the formula :

[tex]k.e = \frac{1}{2} \times m \times {v}^{2} [/tex]

Let k.e = 6000,

Let v = 28,

[tex]6000 = \frac{1}{2} \times m \times {28}^{2} [/tex]

[tex]6000 \div 784 = \frac{1}{2} \times m[/tex]

[tex] \frac{1}{2} \times m = \frac{375}{49} [/tex]

[tex]m = \frac{375}{49} \div \frac{1}{2} [/tex]

[tex]m = \frac{375}{49} \times 2[/tex]

[tex] m = \frac{750}{49} [/tex]

[tex]m = 15.3kg \: (3s.f)[/tex]

Answer:

2)primary mirror

Explanation:

A reflecting telescope contains mirrors and a refracting telescope contains lenses. There are two mirrors in basic reflecting telescope. The primary mirror gathers the light from the bodies at distance and reflects it towards the secondary mirror. The secondary mirror is placed at such an angle that it then reflects the light towards the eye piece and we can observe the faraway body.

Answer:

B. Primary mirror

Explanation:

Answer:

A. Pp - square pant

    pp - round pant

B. 1 out of 2 or 50%

C. 1 out of 2 or 50%

Explanation:

Assuming that square pant shape is represented by the allele P, the alternate version (round pant) will be p.

Spongebob's genotype will be Pp since he is heterozygous for his square pant shape.

SpongeSusie's genotype will be pp since she is homozygous for her round pant shape.

Pp   x   pp

Progeny: 2Pp, 2pp (See the attached image for the Punnet's square)

Possible genotypes and phenotypes of the children:

Pp - Square pant

pp - round pant

Chances of a child with a square shape = 1/2 or 50%

Chances of a child with a round shape = 1/2 or 50%

Answer:

50

Explanation:

Answer:

I believe it would be Pennsylvania and New Jersey they both border Maryland. Didn't see any other states that border Maryland with West Virginia and Virginia being exempt from the question.

Explanation:

Answer:  the correct answer is Maryland and Virginia

Explanation:  

Answer:

(a) 165.46 V

(b) 7.78 A

Explanation:

(a) From the question,

Vrms = V₀/√2...................... Equation 1

Where V₀ = maximum potential difference across a lamp connected to the outlet.

make V₀ the subject of the equation.

V₀ = √2(Vrms)............... Equation 2

Given: Vrms = 117 V.

Substitute into equation 2

V₀ = (√2)(117)

V₀ = 165.46 V.

(b) Similarly,

I₀ = √2(Irms)....................... Equation 3

Given: Irms = 5.5 A

Substitute into equation 3

I₀ = (√2)(5.5)

I₀ = 7.78 A.

Answer:

Answer is radiant and chemical.

Hope this help:)

Sry if wrong

Answer:

Resultant amplitude = 1 unit.

Explanation:

The amplitude of a wave is its maximum displacement during propagation.

Since the two waves are out of phase, the resultant amplitude can be determine by;

Resultant amplitude, [tex]A_{R}[/tex] = [tex]\sqrt{A_{1} ^{2} + A_{2} ^{2} + 2A_{1} A_{2}cos \alpha }[/tex]

                                        = [tex]\sqrt{(A_{1} - A_{2} )^{2} }[/tex]

                                        = [tex]A_{1}[/tex] -  [tex]A_{2}[/tex]

where [tex]\alpha[/tex] is the phase difference.

Given that: [tex]A_{1}[/tex] = 75 units, [tex]A_{2}[/tex] = 74 units, so that;

[tex]A_{R}[/tex] = 75 - 74

     = 1

The resultant amplitude of the two wave when out of phase is 1 unit.

Answer:

Resultant amplitude = 1 unit.

Explanation:

The amplitude of a wave is its maximum displacement during propagation.

Since the two waves are out of phase, the resultant amplitude can be determine by;

Resultant amplitude,  =

                                       =

                                       =  -  

where  is the phase difference.

Given that:  = 75 units,  = 74 units, so that;

= 75 - 74

    = 1

The resultant amplitude of the two wave when out of phase is 1 unit.

Answer:

its B

Explanation:

Answer:

It's B, No, because the grains are arranged in thin, parallel layers.

Explanation:

I literally took the test 5 seconds ago and it was right.

Answer:

It will increase

Explanation:

All other things being equal, an increase in voltage will produce a corresponding increase in current, or flow of electrons. Voltage and current are related in a positive way, as one increases the other increases and vice versa.

Answer:

Junior Member. A 60 lb weight is located 3 feet from the fulcrum of a lever.

Explanation:

Answer:

7.8 J/g °C

Explanation:

0.39 J/g °C x 200 J / 10g

= 7.8 J/g °C

Answer:

above is the answer to your question.

Answer:  b)Gases

Explanation: Because the Particle are moving freely

Answer:

Tools that require electricty like drills

Explanation:

Answer: Power tools are those tools that are use with electricity...

Explanation: