By what process do electromagnetic waves release electrons from the
materials they contact?
O A. The photoelectric effect
O B. Absorption of electromagnetic waves
O C. Flow of electrons from negative to positive poles
O D. Reflection of electromagnetic waves

Answer:

The pH of a system is dependent on the concentration of hydrogen ions present in that system. The concentration of hydrogen ions in a solution is the amount of hydrogen ions (in the units of mol) present in a liter of solution.

Explanation:

Answer:

0.41 μm or 410 nm

Explanation:

Given that

Soap thickness, t = 77.1 nm = 77.1*10^-9 m

Refractive index of water, μ = 1.33

The longest wavelength for constructive wavelength is given by the formula

2μt = (n - 1/2)λ

Making λ the subject of the formula gives

λ = 2μt / (n - 1/2), substituting the values, we have

λ = (2 * 1.33 * 77.1*10^-9) / 1/2

λ = (2.66 * 77.1*10^-9) / 1/2

λ = 2.05*10^-7 / 1/2

λ = 4.10*10*^-7 m

λ = 0.41 μm

The longest wavelength requested therefore is 0.41 μm or 410 nm

Answer:

wave D has higher frequency then wave c

wave C has longer wavelength

wave D has a higher pitch

Explanation:

Answer: Isn't frequency the amount of times something happened? So I'd say A also E

Explanation:

(Don't rely I'm not that smart)

Answer:

When the student slides the rock along the flat surface of the frozen pond, according to Newton's second law of motion, the rock is given an initial velocity of motion. According to Newton's first law of motion, the rock will continue to slide indefinitely unless it is slowed or stopped by an opposite force. According to Newton's third law, the rock experiences a reaction force from the force of friction of the ice which slows it down at a rate given by Newton's second law of motion and the rock is seen to decelerate

Explanation:

Newton's first law of motion, states that an object will remain at rest or maintain a uniform motion in a straight line, unless impressed upon by an external force

Newton's second law states that an applied force is equal to the rate of change of momentum it produces

Newton's third law states action and reaction are equal and opposite.

Answer:

Light bulbs are rated in watts to indicate how much energy they consume. Does the wattage of a light bulb have anything to do with brightness? ... In general, that works well with traditional incandescent light bulbs. ... It's also worth noting that kW can be synonymous with “demand” if you're talking to a utility ...

Explanation:

Light bulbs are rated in watts to indicate how much energy they consume. Does the wattage of a light bulb have anything to do with brightness? ... In general, that works well with traditional incandescent light bulbs. ... It's also worth noting that kW can be synonymous with “demand” if you're talking to a utility ...

Answer:

13.66 kJ

Explanation:

Given that

Mass of Pam, m = 40.4 kg

Distance moved by the force, d = 26.7 m

Speed attained by Pam, v = 26 m/s

The kinetic energy is given by the formula, K.E = 1/2 mv², where

K.E = the needed kinetic energy

m = mass of the object(Pam)

v = velocity of the object(Pam)

Applying the formula, we have

K.E = 1/2 * 40.4 * 26²

K.E = 20.2 * 676

K.E = 13655.2 J

The Kinetic Energy is 13.66 kJ

Answer:

The cyclist's average speed is 13.43 [tex]\frac{km}{h}[/tex]

Explanation:

Speed ​​is a quantity that expresses the relationship between the space traveled by an object and the time used for it. That is, speed is the magnitude that expresses the variation in position of an object and as a function of time, which would be the same as saying that it is the distance traveled by an object in the unit of time.

Average speed relates the change in position to the time taken to effect that change:

[tex]speed=\frac{change in position}{time} =\frac{distance}{time}[/tex]

In this case:

Replacing:

[tex]speed=\frac{47 km}{3.5 h}[/tex]

and solving, you get:

speed= 13.43 [tex]\frac{km}{h}[/tex]

The cyclist's average speed is 13.43 [tex]\frac{km}{h}[/tex]

Answer:

1. Divide the weight by speed of the people pushing it to get net force

2. Whether one side of the object is pushing harder or not you will get ur answer, for example if the left side is pushing 3 newtons to the right and the right side pushing 5 newtons to the left, the net force would be 2 newtons of force pushing left and if its an even amount of force then it will be 0

3. If one side of an object pushes harder than the other side, then the object will move in favor of the one who is pushing harder.

4. 200 newtons or 200N

Explanation:

Answer:

Pulleys accomplish 2 separate operations throughout the computer controlled additional benefit technologies listed elsewhere here.

Explanation:

Answer:

Condensation

Explanation:

Increased pressure is called condensation or compressions because they are regions of high air pressure whilst rarefractions are low air pressure.

Answer:

E = 16.464 J

Explanation:

Given that,

Mass of tetherball, m = 0.8 kg

It is hit by a child and rises 2.1 m above the ground, h = 21. m

We need to find the maximum gravitational potential energy of the ball. The formula for the gravitational potential energy is given by :

E = mgh

g is acceleration due to gravity

E = 0.8 kg × 9.8 m/s² × 2.1 m

= 16.464 J

So, the maximum potential energy of the ball is 16.464 J.

We have that the work the engine did is

w=1710000J

From the Question we are told that

Power  P=190,000 W

T= 9 s

Generally the equation for the work   is mathematically given as

[tex]w=pt\\\\w=190,000*9s\\\\w=1710000J[/tex]

For more information on this visit

https://brainly.com/question/21231013?referrer=searchResults

Answer:

Not accounting for friction, the ball would be falling at 14.0 m/s

Explanation:

Without a coefficient of kinetic friction being provided, we'll have to assume zero friction between the ball and the air.

In that case, the ball's horizontal speed will remain 10 m/s.  To find it's velocity in five seconds then, we just need to take gravity into account.

Let's assume acceleration from gravity is 9.8 m/s².  We can simply multiply that by five seconds to find out how fast it's going at that point:

[tex]9.8\frac{m}{s^2} \times 5s\\= 49 \frac{m}{s}[/tex]

So at five seconds, the ball is moving horizontally at 10 m/s and vertically at 479 m/s.

Now we can simply take the hypotenuse between those two vectors to get the actual speed:

[tex]s = \sqrt{9.8^2 + 10^2}\frac{m}{s}\\s = \sqrt{96.04 + 100}\frac{m}{s}\\s = \sqrt{196.04}\frac{m}{s}\\s = 14.0 \frac{m}{s}\\[/tex]

So lacking air to slow it down, the ball would be going at approximately 14.0 metres per second.

Answer:

The temperature will decrease (get colder).

Explanation:

Enthalpy changes are heat changes accompanying physical and chemical changes. The enthalpy change is the difference between the sum of the heat contents of products and the sum of heat contents of reactants.

Answer:

It simply means that the longest side of the object is 4 m that is 400cm..

Explanation:

___________

Answer:

117 kg

Explanation:

Step one:

given data

time t= 6.5s

velocity v= 30m/s

Force F= 540N

Required

the mass m

Step two:

Recall from the expression

Ft= mv

make m subject of the formula

m= Ft/v

substitute

m= 540*6.5/30

m=3510 /30

m=117 kg

Answer:

True

Explanation:

A mnemonic device is a method employed to make the memory have the ability to remember things, improve the memory, and generally improve the long term ability of the memory such that the brain develops more ability to store information until when needed and collect the stored information when needed. This is achievable when the information that needed to be remembered are stored using rhymes of songs, abbreviations of words using the initial letters. For example, "MR NIGER D" can be used to store the characteristics of living things like:

M - movement

R - Respiration

N - Nutrition

I - Irritability

G - Growth

E - Excretion

R - Reproduction

D - Death

Answer:

true

Explanation:

edge2020

Explanation:

In a chemical reaction, when mass is conserved , the number of atoms or moles of the reactants must be equal to the number of moles or atoms in the products side.

From the diagram, we should carefully look to see if the number of atoms that makes up the reactants are equal to those on the product side.

 For example:

      A + B → AB

Here, mass is conserved because, on the reactant side, we have 1 atom of A and on the product side we have 1 atom of A

For B, on the reactant side, we have 1 atom of B and on the product side, we have 1 atom of B.

Answer:

Yes, because the number of each type of atom is the same in the products as it is in the reactants.

Explanation:

Answer: There are little tiny batteries that are contained within the molecules of the food. The sun charges these batteries, and when the food is eaten, the energy from the batteries flows through the acids in the stomach, which gives the person or animal energy. In gasoline, the energy is created when the gasoline is set on fire and burned, there is no energy within it already. So they are different forms of energy. Hope this helps!

Answer:

Energy is stored in food as molecular bonds

Explanation:

Energy rich molecules are Glycogen, carbohydrates, triglycerides, and lipids are energy storage molecules,

Answer:

I can't see the picture

Explanation:

Answer:

243.75kJ

Explanation:

Step one:

Given parameters

Height= 39meters

mass= 625g

g= 10m/s

Required

The potential energy PE

Step two:

the expression for the potential energy is given as

PE=mgh

PE=625*10*39

PE=243750 J

PE=243.75kJ

Answer:

[tex]s=-38.332m[/tex]

Explanation:

From the question we are told that

Cylinder of mass [tex]m=2.90 kg[/tex]

Radius [tex]R=30.0 m[/tex]

Mass of bucket [tex]M_b= 1.90 kg[/tex]

Fall time [tex]T_f= 3.70 seconds[/tex]

Generally the tension the bucket is mathematically given by

[tex]T-mg=ma[/tex]

For cylinder

 [tex]T=I*\alpha[/tex]

 where

[tex]I=1/2mR^2[/tex]

[tex]a=R*\alpha[/tex]

Giving

[tex]T=-1/2mR\alpha[/tex]

Therefore

[tex]a=\frac{-mg}{m+1/2m}[/tex]

[tex]a=\frac{-(1.9*9.81)}{1.9+0.5*(2.9)}[/tex]

[tex]a=-5.563880597 \approx -5.6m/s^2[/tex]

Generally the Newton's equation for motion is mathematically represented as

 [tex]s=ut+1/2at^2[/tex]

 [tex]s=0(3)+1/2*-5.6*(3.7)^2[/tex]

[tex]s=-38.332m[/tex]

Answer:

The apple travels at 3.6 m/s

Explanation:

The Law Of Conservation Of Linear Momentum

The total momentum of a system of bodies is conserved unless an external force is applied to it.

The formula for the momentum of a body with mass m and speed v is:

P = mv

If we have a system of two bodies the total momentum is the sum of the individual momentums:

[tex]P=m_1v_1+m_2v_2[/tex]

If a collision occurs and the velocities change to v', the final momentum is:

[tex]P'=m_1v'_1+m_2v'_2[/tex]

Since the total momentum is conserved, then:

P = P'

Or, equivalently:

[tex]m_1v_1+m_2v_2=m_1v'_1+m_2v'_2[/tex]

Solving for v2':

[tex]\displaystyle v'_2=\frac{m_1v_1+m_2v_2-m_1v'_1}{m_2}[/tex]

The arrow has a mass of m1=0.2 kg and travels at v1=32.2 m/s. It hits an apple (assumed stationary at v2=0) of mass m2=0.77 kg and continues through the apple with a speed of v1'=18.3 m/s. We'll calculate the speed of the apple after the hit.

[tex]\displaystyle v'_2=\frac{0.2*32.2+0.7*0-0.2*18.3}{0.77}[/tex]

[tex]\displaystyle v'_2=\frac{2.78}{0.77}[/tex]

[tex]v'_2=3.6 \ m/s[/tex]

The apple travels at 3.6 m/s

Answer:

hello the diagram related to this question is missing attached below is the missing diagram

Answer :

The magnitude of the electric field = 4KQ / L^2

direction = 45° east to south

Explanation:

The magnitude of the electric field = 4KQ / L^2

direction = 45° east to south

Answer:

I believe its the blue, sorry if I'm wrong

Answer:

B: A  material with relatively weak bonds between it's particle can be shped in to a thin sheet.

Explanation:

Answer:

10.5min

Explanation:

Given parameters:

Distance  = 4200m

Speed  = 400m/min

Unknown:

Time taken for this run  = ?

Solution:

Speed is the distance divided by the time taken.

   Speed  = [tex]\frac{distance }{time }[/tex]  

  Time  = [tex]\frac{distance}{speed }[/tex]  

 Now insert the parameters and solve;

 Time  = [tex]\frac{4200}{400}[/tex]   = 10.5min