Which diagram best illustrates what happens when electromagnetic waves strike a reflective material?

Given :

A car slows down from -27.7 m/s to -10.9 m/s while undergoing a displacement of -105 m.

To Find :

The acceleration of the car.

Solution :

We know, by equation of motion :

[tex]2as = v^2 -u^2\\\\a = \dfrac{v^2 -u^2 }{2s}\\\\a = \dfrac{(-10.9)^2 - ( -27.7)^2}{2\times ( -105 )}\\\\a = 3.088\ m/s^2[/tex]

Therefore, acceleration of the car is 3.088  m/s².

Answer:

P = 173.33 [W]

Explanation:

Power is defined as the amount of work done over a given time.

W = work = 520 [J]

t = time = 3 [s]

P = power [w]

Therefore by working relationship over time we can calculate the power.

[tex]P =W/t\\P = 520/3\\P=173.33[W][/tex]

Answer: FUNDAMENTAL unit are the accepted standard units while DERIVED units are developed from combinations of fundamental units.

Explanation:

FUNDAMENTAL UNITS are the generally accepted units which includes the following with their symbols in international system of units:

--> length (meter) m

--> mass (kilogram) kg

--> time( second) s

--> temperature (Kelvin) k

--> current (ampere) A

--> luminous intensity ( Candela) cad

--> amount of substance ( mole) mol

DERIVED UNITS are usually developed from fundamental units and they include the following with their symbols in international system of units:

--> Area ( m²)

--> Volume (m³)

--> Speed ( m/s)

--> Velocity ( m/s)

--> Acceleration ( m/s²)

--> Force ( kgm/s²)

--> Density ( kgm/s³)

--> Power ( J/ s)

--> Pressure ( N/m²)

Answer:

cell membrane- controls what goes in and out of a cell

cell wall- protects DNA and other organelles inside a cell

ribosomes-makes and produces proteins

Answer:

I think no B

if wrong correct me plsssssss

Mark me brainliest

have a nice day

I will always help you understanding your assingments

#Captainpower:)

Answer:

1. kinetic is when an object is moving and potential where the object is place

2. W and Y

3. X and Z

Answer:

C. Magnetic fields of atoms aligning

Answer:

c

Explanation:

a pex

Answer:

Explanation:

The formula for KE is

[tex]KE=\frac{1}{2}mv^2[/tex] which makes solving our problem for velocity super easy. We will rewrite the formula in terms of v to get:

[tex]v=\sqrt{\frac{2KE}{m} }[/tex] and filling in:

[tex]v=\sqrt{\frac{2(50)}{25} }[/tex] so

v = 2 m/s to the correct number of sig fig's

Answer:

never scared

that might help you

Answer:

in my calculation the answer is letter a but in goo gle the answer is letter c

which one will you trust?

Explanation:

dont report me or i will report you

Answer:

115.3 is the direction of the vector. Just learned some physics to get this answer over the past 3 hrs

Answer:

a. Vf = 39.24 [m/s]

b. Vf = 31.24 [m/s]

c. Vf = 47.24 [m/s]

Explanation:

To solve this problem we can use the following equation of kinematics. We have to keep in mind that the gravitational acceleration acts downwards, therefore when the rock falls towards the abyss it has the same direction of the acceleration and that is why the gravitational acceleration has a positive sign in the equation.

[tex]v_{f}=v_{o}+g*t[/tex]

where:

Vf = final velocity [m/s]

Vo = initial velocity = 0 (when the rock is dropped)

g = gravitational acceleration = 9.81 [m/s²]

t = time = 4 [s]

a.

[tex]v_{f}=0+9.81*4\\v_{f}= 39.24 [m/s][/tex]

b.

In this particular situation, the acceleration will be taken as negative because the gravity is pointing in the opposite direction of the movement of the rock.

[tex]v_{f}=8-(9.81*4)\\v_{f}=-31.24[m/s][/tex]

The negative sign in the answer tells us that the rock no longer moves up instead it does downwards when 4 seconds have passed.

c.

[tex]v_{f}=8+(9.81*4)\\v_{f}=47.24[m/s][/tex]

Answer:

Aluminum foil is a physical change. A further explanation is given below.

Explanation:

Answer:

6.3 m/s

Explanation:

A student drops a wooden block from rest through a photogate 2 m below. Since there is a conservation of the gravitational potential energy and the kinetic energy, the final speed of the block is B. 6.3 m/s.

A wooden block is dropped from rest. If energy is conserved, the initial gravitational potential energy (U₁) will be equal to the final kinetic energy (K₂).

U₁ = K₂

m × g × h₁ = 1/2 × m × v₂²

where,

m × g × h₁ = 1/2 × m × v₂²

g × h₁ = 1/2 × v₂²

v₂ = √(2 × g × h₁)

v₂ = √(2 × (9.8 m/s²) × 2 m) = 6.3 m/s

A student drops a wooden block from rest through a photogate 2 m below. Since there is a conservation of the gravitational potential energy and the kinetic energy, the final speed of the block is B. 6.3 m/s.

Learn more about conservation of energy here: https://brainly.com/question/14525402

Answer:

Gravity (please mark me as the brainiest)

Explanation:

Gravity is a force caused by a large body, such as the Earth. Gravity pulls objects toward the Earth.

And give me a thanks, or vote

Answer:

George Washington

Explanation:

Answer:

well for me

Explanation:

It was George Washington

Explanation:

Antinodes are not the same thing as the amplitude , but they are very closely related. The amplitude is the distance from the rest position of the wave to the antinode . The antinode is just a point along the wave that has the greatest maximum velocity in the y-direction.

The amplitude of a standing wave doesn't remain the same throughout the wave. It keeps on changing as it is a function of x.

Where the amplitude is minimum is called?

The locations at which the absolute value of the amplitude is minimum are called nodes, and the locations where the absolute value of the amplitude is maximum are called antinodes.

Explanation:

Antinodes are not the same thing as the amplitude , but they are very closely related. The amplitude is the distance from the rest position of the wave to the antinode . The antinode is just a point along the wave that has the greatest maximum velocity in the y-direction .

intro urself please

Answer:

-180 V

Explanation:

Given that,

No. of turns, N = 150

If the field increases uniformly from 0.00 T to 0.95 T and each coil of wire has an area of 1.4 m²

The coil will move perpendicular through a uniform magnetic field in 1.1 s.

We need to find the magnitude of the induced emf in the coil. The formula for the induced emf is given by :

[tex]\epsilon=\dfrac{-d\phi}{dt}\\\\=\dfrac{-d(BA)}{dt}\\\\=-A\dfrac{dB}{dt}[/tex]

Put all the values,

[tex]\epsilon=-NA\dfrac{dB}{dt}\\\\=-150\times 1.4\times \dfrac{0.95-0}{1.1}\\\\=-181.36\ V[/tex]

Out of four options, induced emf is (-180 V)

So, induced emf in the coil is (-180 V). Hence, the correct option is (c).

Hope this helps.......☺

Answer:

The velocity of the truck is 3.33 m/s

Explanation:

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 velocity v is  

P=mv.  

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

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

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

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

In a system of two masses:

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

There are two objects: The m1=4000 Kg car and the m2=6000 Kg truck. The car was moving initially at v1=4 m/s and the truck was at rest v2=0. After the collision, the car moves at v1'=-1 m/s. We need to find the velocity of the truck v2'. Solving for v2':

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

Substituting:

[tex]\displaystyle v'_2=\frac{4000*4+6000*0-4000(-1)}{6000}[/tex]

[tex]\displaystyle v'_2=\frac{16000+4000}{6000}[/tex]

[tex]\displaystyle v'_2=3.33[/tex]

The velocity of the truck is 3.33 m/s

Explanation:

The mass of a ball, m = 2 kg

It is traveling with a speed of 10 m/s

The ball's kinetic energy just as it leaves the boy's hand is calculated as follows :

[tex]K=\dfrac{1}{2}mv^2\\\\K=\dfrac{1}{2}\times 2\times (10)^2\\\\=100\ J[/tex]

The ball's kinetic energy just as it leaves the boy's hand is 100 J. The potential energy of the ball when it reaches the highest point is same as the kinetic energy as it leaves the boy's hand.

Hence, the required kinetic and potential energy is 100 J.

Answer:

1.55m

Explanation:

The formula for calculating the maximum height is expressed as;

H = u²/2g

u is the initial velocity

g is the acceleration due to gravity

Substitute

H = 1²/2(9.8)

H = 1/19.6

H = 0.051m

Since it is launched form a height of 1.5m, the height above the ground will be 1.5+0.051 = 1.55m

Answer:

Breaks because it doesn't have force in the radial direction and thus due to inertia the stones will fly off tangentially.

Explanation:

Until the stone is tied to a string, it will possess centripetal force and centrifugal force along the radial direction of motion due to the tension present in the string. Now, when the rope breaks, it breaks because it doesn't have force in the radial direction and thus due to inertia the stones will fly off tangentially.

Answer:

True

Explanation:

It is a true statement that "Patriotism and education are traditional American values."

The United States of America are bound together by certain core values that hold the entire country  together. These values are reverberated any time the ideals of the country are discussed.

Two of the key values of the American society are;

Hence, it is a true statement that "Patriotism and education are traditional American values."

Learn more about patriotism: https://brainly.com/question/779632

Answer:

6.67x10^-11 N-m^2/kg^2

Explanation:

Answer:

The correct option is;

Elastic

Explanation:

In an elastic collision, the initial kinetic energy of the system is equal to the final kinetic energy of the system, such that there is no loss in the net kinetic energy available at a specific time or stage in the system

Therefore, we have;

1/2·m₁·v₁₁² + 1/2·m₂·v₂₁² = 1/2·m₂·v₁₂² + 1/2·m₂·v₂₂²

From which we get;

m₁·v₁₁ + m₂·v₂₁ = m₂·v₁₂ + m₂·v₂₂

Which is indicates that the initial and momentum of the system is also conserved

Therefore, in an elastic collision, both momentum and kinetic energy are conserved.

Answer:

12%

Explanation:

number of students decreased=54

percentage of students decreased= 54/450 x 100

=12%

Answer:

[tex]\boxed {\boxed {\sf 6 \ meters \ per \ second}}[/tex]

Explanation:

Speed can be found by dividing the distance by the time.

[tex]s=\frac{d}{t}[/tex]

The distance is 18 meters and the time is 3 seconds.

[tex]d= 18 \ m \\t= 3 \ s\\[/tex]

Substitute the values into the formula.

[tex]s=\frac{18 \ m }{ 3 \ s }[/tex]

Divide.

[tex]s= 6 \ m/s[/tex]

The speed of the puck is 6 meters per second.

Answer:

Speed

As we know that

[tex] \sf Speed = \dfrac{Distance}{Time} [/tex]

[tex] \sf \: Speed = \dfrac{18}{3} [/tex]

Cancelling both by 3

[tex] \sf \: Speed = 6 \: mps[/tex]

Answer:

the size of something from one end to the other; how long something is