Which statements are true?​

[tex]{\underbrace{\sf{PHOTO-ELECTRIC~EFFECT }}}[/tex]

The photoelectric effect is a phenomenon in which electrons are ejected from the surface of a metal when light is incident on it. These ejected electrons are called photoelectrons. It is important to note that the emission of photoelectrons and the kinetic energy of the ejected photoelectrons is dependent on the frequency of the light that is incident on the metal’s surface.

Answer:

Photoelectric effect is the phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it.

Answer:

Just convert the answers down, plug in the numbers and move the decimal to where it needs to be equal to.

Answer:

I have already given answer

Explanation:

see in upper comment there is my answer :)

Answer:

Unbalanced forces

When two forces acting on an object are not equal in size, we say that they are unbalanced forces. The overall force acting on the object is called the resultant force. If the forces are balanced, the resultant force is zero.

If the forces on an object are unbalanced, this is what happens:

a stationary object starts to move in the direction of the resultant force

a moving object changes speed and/or direction in the direction of the resultant force

In the example below, the resultant force is the difference between the two forces:

100 – 60 = 40 N (to the right)

Using moments

A see-saw will balance if the moments on each side of the pivot are equal. This is why you might have to adjust your position on a see-saw if you are a different weight from the person on the other end.

If a nut is difficult to undo with a short spanner, a longer spanner will help. This is because there will be a bigger moment on the nut, when the same force is applied further from the pivot.

Using the same principle you can increase the moment applied by a lever or a crowbar, and this can help you move heavy objects more easily.

Answer:

right about everything real life and doing or you love doing

Explanation:

I did the same thing I got a hundred on it

Answer: static friction

Explanation:

During sliding, contact points do not get enough time to get interlocked properly. Therefore, less friction. But, when the object is at rest, the surfaces interlock well, therefore friction is more. This explains why sliding friction is less than static friction.

The simple pendulum concept and rotational kinematics relationships allow finding the result for the velocity relationship

               w₁ = [tex]\sqrt{2}[/tex]  w₂

The simple harmonic movement is a periodic movement where the restoring force is proportional to the elongation, in the case of the simple pendulum it is fulfilled for angles less than 10º.  The expression for motion is

          θ  = θ₀ cos ωt

         ω² = g / l

the angular velocity is defined by

         w = [tex]\frac{d \theta}{dt}[/tex]  

         w = - θ₀ ω sin ωt

Where θ₀ is the initial angle or amplitude, w is the angular velocity, t the time, g the acceleration of gravity and l the length of the pendulum

Let's find the angular velocity for each pendulum

          ω ₁ = [tex]\sqrt{ \frac{g}{l_1} }[/tex]

Indicate that the second pendulum length is

          l₂ = 2 l₁

         ω₂ = [tex]\sqrt{\frac{g}{2l_1} }[/tex]  

the pendulum speed is maximum at the lowest point of the trajectory that occurs when the sine function has its maximum value

          w =  θ₀ω  

Suppose that the two pendulums are released with the same initial angle

Pendulum 1

          w₁ =  θ₀ [tex]\sqrt{\frac{g}{l_1} }[/tex]

Pendulum 2

          w₂ = θ₀  [tex]\sqrt{\frac{g}{2l_1} }[/tex]

We look for the relationship between the two speeds

           [tex]\frac{w_1}{w_2} = \sqrt{2}[/tex]  

In conclusion, using the simple pendulum concept and the rotational kinematics relations we can find the result for the velocity relation

             w₁ = √2 w₂

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During rubbing, [tex]^E^L^E^C^T^R^O^N^S[/tex] are transferred between the woolen cloth and the balloon.

Hope this helps!

[tex]GraceRosalia[/tex] here to help

Answer:

The Independent Variable is the recorded fingerprint pattern.

The Dependent Variable is the shape of the fingerprint pattern.

The Control Group does not receive the Variable that you are testing

Explanation:

Answer:

Below

Explanation:

To find the wave speed of a wave you can use this formula :

     wavespeed (v) = (frequency) x (wavelength λ)

Plug in our values :

     v = (10Hz) x (2m)

     v = 20 m/s

Hope this helps!

Now, seriously !

There's a stream of objects flowing past you.

Ten of them pass you every second.

Each one is 2m long.

Don't you think you can figure out how fast they're flowing ?

Given;

V = 230V

Power, P = 100W

time, t = 2hrs = 7200s

from,

P = IV

and Energy, E= Pt

E = 100*7200

E = 720000 Joules

E = 720KJ

Answer:

Formula  E(J) = P(W) × t(s)

3600 Seconds in an hour

7200 seconds in two hours.

watts = 100

100 x 7200 = 720000

Explanation:

Watts to joules calculation

The energy E in joules (J) is equal to the power P in watts (W), times the time period t in seconds (s):

E(J) = P(W) × t(s)

Energy cannot be created or destroyed, only converted from one form to another. These conversions can be shown in Sankey diagrams. Efficiency is a measure of how much useful energy is converted. Attachment 1

Modern energy-saving lamps and LEDs (light-emitting diodes) work in a different way. They transfer a greater proportion of electrical energy as light energy. Attachment 2

From the diagram, you can see that much less electrical energy is transferred, or 'wasted', as heat energy from the energy-saving lamp. It's more efficient than the filament lamp.

Calculating efficiency

The efficiency of a device, such as a lamp, can be calculated:

efficiency = useful energy out ÷ total energy in (for a decimal efficiency)

or

efficiency = (useful energy out ÷ total energy in) × 100 (for a percentage efficiency)

The efficiency of the filament lamp is 10 ÷ 100 = 0.10 (or 10%). This means that 10 per cent of the electrical energy supplied is transferred as light energy (90 per cent is transferred as heat energy).

The efficiency of the energy-saving lamp is 75 ÷ 100 = 0.75 (or 75 per cent). This means that 75 per cent of the electrical energy supplied is transferred as light energy (25 per cent is transferred as heat energy).

Note that the efficiency of a device will always be less than 100 per cent. Occasionally the power is shown in W instead of the energy in J. The equations are the same – just substitute power for energy:

efficiency = useful power out ÷ total power in (for a decimal efficiency)

or

efficiency = (useful power out ÷ total power in) × 100 (for a percentage efficiency)

This is the Sankey diagram for a typical energy-saving lamp:

you can find the resistance using this formula

R = V ÷ I    

where; V is the potential difference in volts, V

I is the current in amperes (amps), A

R is the resistance in ohms, Ω

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Here's the solution :

Let's find the final velocity :

Initial velocity (u) = 0 (cuz it started from rest)

Final velocity (v) = 8 m/s

Time taken (t) = 10 sec

now, we know that :

Acceleration = 0.8 m/s²

Answer: A person with a life vest floating on water, Ship floating on the ocean, Helium balloon rising in the air, etc.

Explanation: Cause I said so uwu

Bernoulli's equation allows to find the result for the change of the kinetic energy of the fluid in the pipe is:  

Fluid mechanics studies the movement of liquid and gases through pipes, for this it uses the Bernoulli's equation, which is the work and energy relationship for fluids.

       P₂ + ½ ρ v₂² + ρ g y₂ = P₁ + ½ ρ v₁² + ρ g y₁

Where the subscripts 1 and 2 are the two points of interest, P is the pressure, ρ the density, v the velocity and y the height.

The expression of kinetic energy in fluids is:

       K = ½ ρ v²

Let's substitute

       K₂ - K₁ = P₁-P₂ + ρ g (y₁-y₂)

      ΔK = P₁-P₂ + rho g (y₁-y₂)

Indicates the density of the fluid is 4 10⁻³ km / m³, there is a height difference of Δy = 100 m and the pressure of 0.08 Pa and 0.02 Pa.

      ΔK = (0.08 -0.02) + 4 10⁻³ 9.8 100

      ΔK = 0.06 + 3.92 ΔK = 3.98 J  

In conclusion using Bernoulli's equation we can find the result for the change in the kinetic energy of the fluid in the pipe is:

        ΔK = 3.98 J

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Answer:

acceleration=force*mass

a=fm

a=15*2.1

a=31.5

acceleration is 31.5

hope it helps

Answer:

letter C

Explanation:

Answer:

Explanation:

Basically the star slowly burns its hydrogen into Helium. Depending on the mass, the star will have a turbulent core where the Helium will be fully mixed or a radiative core where the helium will settle at the centre (remember it's heavier than Hydrogen). The second case is what happens in the Sun.

Answer:

Answer: See below

Explanation: Considering no friction it will continue to slide until an outside force acts upon it such as hitting something or falling off something.

Answer:

4 longitudinal waves

Explanation:

have a beautiful day ahead

i think it looks good

yea it correct

BTW yw if it's right

Answer:

-4000

Explanation:

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The starting angle θθ of a pendulum does not affect its period for θ<<1θ<<1. At higher angles, however, the period TT increases with increasing θθ.

The relation between TT and θθ can be derived by solving the equation of motion of the simple pendulum (from F=ma)

−gsinθ=lθ¨−gain⁡θ=lθ¨

For small angles, θ≪1,θ≪1, and hence sinθ≈θsin⁡θ≈θ. Hence,

θ¨=−glθθ¨=−glθ

This second-order differential equation can be solved to get θ=θ0cos(ωt),ω=gl−−√θ=θ0cos⁡(ωt),ω=gl. The period is thus T=2πω=2πlg−−√T=2πω=2πlg, which is independent of the starting angle θ0θ0.

For large angles, however, the above derivation is invalid. Without going into the derivation, the general expression of the period is T=2πlg−−√(1+θ2016+...)T=2πlg(1+θ0216+...). At large angles, the θ2016θ0216 term starts to grow big and cause 

Answer:

solid

Explanation:

because the molecule of solid is farest than gas

I think the answer is A

Explanation:

the bus has more kg than the car so. the bus need to stop first

Answer:

16.7s

2x10^1 s (if you need a 1 significant digit answer)

Explanation:

The formula for average velocity is

Vavg = Δd/Δt

Fill in the known values

6m/s = 100m/Δt

Rearrange the equation

Δt = 100m/6m/s

Δt = 16.7s

note: this answer assumes that the person travels at a constant 6m/s (the person does not slow down or speed up)

One newton of gold on the moon would have a greater value than a newton of gold on earth because the magnitude of the acceleration due to gravity on the moon is smaller than the gravity on the earth .

It can be defined as the force by which a body attracts another body toward its center as the result of the gravitational pull of one body and another .

As given in the problem, we have to find out which has greater value, a newton of gold on earth or a newton of gold on the moon .

A newton of gold would be worth more on the moon than it would be on earth since the moon experiences a smaller acceleration from gravity than the earth does .

To learn more about gravity here , refer to the link given below ;

brainly.com/question/4014727

#SPJ5

Answer:

a. energy is created as the log burns b. the compounds that make up the log are converted into fire, heat, and energy. c. as the log burns, the nuclear binding energy of the molecules in the log is released. the nuclear binding energy is transformed into the light and heat of the fire. d. the molecules present in the log are transformed into molecules that contain less energy than the original molecules. the energy difference is the heat of the fire?Explanation:

Answer:

 A vector is an object that has both a magnitude and a direction. Geometrically, we can picture a vector as a directed line segment, whose length is the magnitude of the vector and with an arrow indicating the direction.

Explanation:

brainliest plz

Answer:

The correct answer is

Displacement.

As Displacement has both magnitude and direction it is Vector.

Hope it helps.

Plz mark me brainest

Answer:

Hiệu điện thế U=10 V được đặc vào giữ hai đầu một điện trở có giá trị R=25 Q cường độ dòng điện trở bằng bao nhiêu