What is the flow of energy from the falling water to the steam?

a) mechanical -> mechanical -> electrical -> thermal -> thermal

b) mechanical -> mechanical -> electrical -> light -> thermal

c) chemical -> mechanical -> electrical -> thermal -> thermal

d) mechanical -> chemical -> electrical -> thermal -> thermal

Answer: The truck's velocity after braking = 17m/s.

Explanation:

Given: Initial velocity(i) = 25 m/s

Time(t)  = 4s

Acceleration(a) = -2 m/s ²

We use the following formula to compute final velocity (v):

[tex]v= i+at\\\\\Rightarrow\ v=25+(-2)(4\ \ \ [\text{Substitute all values}]\\\\\Rightarrow\ v=25-8\\\\\Rightarrow\ v=17\ m/s[/tex]

Hence, the truck's velocity after braking = 17m/s.

Answer:

27J  

3528J

Explanation:

First problem:

Given parameters:

Mass of tennis ball  = 0.06kg

Velocity of tennis ball  = 30m/s

Unknown:

Kinetic energy  = ?

Solution:

Kinetic energy is the energy due to the motion of a body.

It is expressed as:

       K.E  = [tex]\frac{1}{2}[/tex] m v²  

       K.E =  [tex]\frac{1}{2}[/tex]  x 0.06 x 30²   = 27J  

Second problem:

Given parameters:

Mass = 30kg

Height  = 12m

Unknown:

Potential energy  = ?

Solution:

Potential energy is the energy due to the position of a body.

  Mathematically;

       Potential energy  = mgh

m is the mass

g is the acceleration due to gravity

h is the height

 Now;

          Potential energy  = 30 x 9.8 x 12  = 3528J

Answer:

B,A, and D

Explanation:

Answer:

Explanation:

Due to heat energy , metal expands . Formula for linear expansion is as follows .

L = l ( 1 + α Δt )

where L is expanded length , l is original length , α is coefficient of linear expansion and Δt is increase in temperature .

To pass the sphere through the ring , the diameter of both ring and sphere should be same after heating . Let after increase of temperature Δt , their diameter becomes same as L  . The linear coefficient of brass and steel are

20 x 10⁻⁶ and 12 x 10⁻⁶ respectively .

For steel sphere ,

L = 25 ( 1 + 12 x 10⁻⁶ Δt )

For brass ring

L = 24.9 ( 1 + 20 x 10⁻⁶ Δt )

25 ( 1 + 12 x 10⁻⁶ Δt ) = 24.9 ( 1 + 20 x 10⁻⁶ Δt )

1.004( 1 + 12 x 10⁻⁶ Δt ) =  ( 1 + 20 x 10⁻⁶ Δt )

1.004 + 12.0482 x 10⁻⁶ Δt  =   1 + 20 x 10⁻⁶ Δt

.004 = 7.9518 x 10⁻⁶ Δt

Δt  = 4000 / 7.9518

= 503⁰C.

final temp = 503 + 15 = 518⁰C  .

Answer:

37.5m/s

Explanation:

momentum = mass x velocity

momentum / mass = velocity = speed

75kg*m/s / 2kg = 37.5m/s

Answer:

The average velocity is 4 [tex]\frac{km}{hour}[/tex]

Explanation:

Velocity is the magnitude that relates the change in position with time. That is, the speed expresses the relationship between the space traveled by an object and the time used for it.

The average velocity relates the change in position with the time taken to effect said change through the expression:

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

In this case:

Replacing:

[tex]velocity=\frac{12 km}{3 hours}[/tex]

Solving:

velocity= 4 [tex]\frac{km}{hour}[/tex]

The average velocity is 4 [tex]\frac{km}{hour}[/tex]

Answer:

C

Explanation:

Answer:

the last one. gravitational force is stronger as objects get further apart

The false statement about gravity among the given choices is - D. The Law of Universal Gravitation states that the gravitational force is  stronger as objects get farther apart.

Gravity or the universal gravitational force is the force of attraction exerts between any two objects with mass in the universe. It is also exerted between the attraction of the earth's mass and bodies with mass near its surface.

Thus, The false statement about gravity among the given choices is - option D.

Learn more about the role of gravitational force:

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Answer:

Explanation:

s=d/t

7.5 times 10^10/8.0 times 10^6=9.375 times 10^15

Hope this helps

Answer:

Her displacement is 10km

Explanation:

An illustrative diagram for the journey is shown in the attachment below.

From the question,

She travels north 5km, which is given by /AB/ in the diagram, and 10km west, which is given by /BC/ in the diagram. She then travels 5km south, which is given by /CD/ in the diagram. To determine her displacement,

Displacement is the shortest distance from an initial position to a final position.

Therefore, her displacement is given by /DA/ in the diagram.

NOTE: /DA/ = /BC/ (Opposite sides of a rectangle)

Since /BC/ = 10km

∴ /DA/ = 10km

Hence, her displacement is 10km.

Answer:

the answer is 20 neutrons

Explanation:

Answer:

20 neutrons

The nucleus of an atom of potassium contains 19 protons and 20 neutrons.

Answer:

a = 1.32 [m/s²]

Explanation:

To calculate this problem we can use the following equation of kinematics.

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

where:

Vf = final velocity = 7.2 [m/s]

Vo = initial velocity = 3.5 [m/s]

t = time = 2.8 [s]

a = acceleration [m/s²]

[tex]7.2=3.5+a*2.8\\2.8*a=3.7\\a=1.32[m/s^{2} ][/tex]

Answer:

1.Siddartha Gautama

2.no single founder

3jesus christ

4.muhammad

5.abraham

Answer:

9.1km/hr...................I think I'm not %100

Answer:

alam ko sagot pero mataas

Answer:

The speed of sound in water is two times slower than that in air. Sound travels much faster in space than in water. Warmer water allows sound to travel faster so i think true

Explanation:

Answer:

B is the answer

Explanation:

thank you I hope it helps you

The force is directly related to the magnitudes of the charges and inversely related to the square of the distance between them. Then the correct opption is C.

The Coulomb's law states that the electrostatic force is the ratio of the product of the charges and square of the distance between them.

Let the cherges be q and Q and the distance between them is r. Then the force is given as,

F = kqQ / r²

The power is straightforwardly connected with the extents of the charges and contrarily connected with the square of the distance between them. In this way, the right choice is C.

Thus, the correct option is C.

Learn more about Coulomb's law:

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Answer:

7

Explanation:

[tex]The \ ratio \ of \ brightness \ of \ these \ two \ stars \ is:[/tex]

[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(m_{(second \ star )} - (m_{first \ star } ))}[/tex]

[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(0.6 - (-1.5 ))}[/tex]

[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 2.512^{(2.1)}[/tex]

[tex]\dfrac{b_{first \ star }}{b _{second \ star }}= 6.9[/tex]

[tex]\mathbf{\dfrac{b_{first \ star }}{b _{second \ star }} \simeq 7}[/tex]

Answer:

Both Electrical and Magnetic Forces take place between two charged objects

Explanation:

Answer:

Explanation:

Sphere B and sphere A are touching so they will act as a single body . A positively charged sphere C is brought near sphere B . So there will be induction of charge on sphere B and sphere A . Opposite charge will be induced on nearer sphere and same charge will be induced on distant sphere . Hence sphere B will be negatively charged and sphere A will be positively charged. The amount of charge induced on sphere B and A will be same and it will remain as long as sphere C is kept near sphere B . As soon as sphere C is removed , induced charges will also neutralize each other .

Answer:

YES. 6√10

Explanation:

apply E=1/2mv^2 and find the velocity of carriage which is 6√10 ms-1

as our velocity is higher than that of cart. we can catch the carriage

Answer:

B) a leaf blown from a tree by the wind

Answer:

the answer is B A leaf being blown from a tree by the ground

Answer:

W = 83 [N] (weight)

Explanation:

We must clarify that the system is in static equilibrium, in such a way that we must perform a sum of forces on the Y-axis equal to zero, in order to determine the downward force corresponding to the weight of the child.

∑Fy = 0

[tex]F_{1}+F_{2}-m*g=0\\18+65=m*g\\m*g = 83 [N][/tex]

And the mass can be determined as follows:

[tex]m*g=83\\m = 83/9.81\\m=8.46[kg][/tex]

The weight of the child is equal to 83 Newton.

Given the following data:

To determine the weight of the child:

From the diagram, we can deduce that the system is in static equilibrium. Thus, we would resolve the horizontal component of the forces, in order to determine the downward force (weight of child).

Mathematically, the horizontal component of the forces is given by:

[tex]\sum F_y = 0\\\\F_1 +F_2 -mg=0[/tex]

Substituting the given parameters into the formula, we have;

[tex]18+65-mg=0\\\\83=mg[/tex]

Note: Weight = mg

Weight of child = 83 Newton.

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Answer:

Power = 0.33 Watts

Explanation:

Given the following data;

Distance = 1m

Force = 20N

First of all, we would solve for the work done by the boy.

Workdone = force * distance

Substituting into the equation, we have;

Workdone = 20*1 = 20J

Now to find power;

Power = workdone/time

Power = 20/60

Power = 0.33 Watts.

Answer:

43.83 nC

Explanation:

We know Q = ε₀Ψ where Q = charge enclosed by the cubic box,  ε₀ = permittivity of free space = 8.854 × 10⁻¹² F/m and Ψ = net electric flux through cubic box = 4950 Nm²/C

So, substituting the values of the variables into the equation, we have

Q = ε₀Ψ

= 8.854 × 10⁻¹² F/m × 4950 Nm²/C

= 43827.3 × 10⁻¹² C = 4.38273 × 10⁻⁸ C

= 43.8273 × 10⁻⁹ C

= 43.8273 nC

≅ 43.83 nC

Answer:Nuclear power

Answer: geothermal

Explanation: I just took this test.