PHYSICS HIGH SCHOOL

In a nuclear power plant, _____. energy is released from the nuclei of atoms energy is released from the bonds of molecules energy is released from the electrons of atoms energy is stored in the nucleus of atoms

Answers

Answer 1
Answer: In a nuclear power plant, energy is released from the nuclei of atoms. The correct option among all the options given in the question is the first option. Huge amount of thermal energy is released by the breaking of the uranium atoms. This energy is used for turning a turbine that produces electricity. It is a very clean method of producing electricity. 
Answer 2
Answer:

Answer: energy is released from the nuclei of atoms

Explanation:

Chemical energy is the energy stored in the bonds of molecules.

Nuclear energy is the energy stored in the nucleus of the atom.

Nuclear power plants use heat produced during nuclear fission to heat water which is produced by the splitting of heavy nucleus into lighter elements by release of energy.

The complete nuclear fission reaction is:

_(92)^(235)\textrm{U}+_0^1\textrm{n}\rightarrow _(56)^(143)Ba+_(36)^(90)Kr+3_0^1\textrm{n}

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Which device is using a motor?A water heater creates heat energy from electric energy.

A waterfall rotates a waterwheel to turn an axle.

A body massager uses electric energy to move back and forth.

A solar charger creates electric energy from the Sun.

Answers

Out of all the options, only body massager which uses electric energy to move back and forth is using motor here. It is because a motor converts electrical energy to Mechanical energy and only massager obeys it among all the options.

In short, Your Answer would be Option C

Hope this helps!

Answer:  C.

A body massager uses electric energy to move back and forth.

Explanation:

Determine the change in velocity of a car that starts at rest and has a final velocity of 20m/s north

Answers

The change in velocity of a car that starts at rest and has a final velocity of 20 meters/second north would be 20 meters/second.

What is acceleration?

The rate of change of the velocity with respect to time is known as the acceleration of the object. Generally, the unit of acceleration is considered as meter/seconds².

As given in the problem we have to find the  change in velocity of a car that starts at rest and has a final velocity of 20m/s north,

the final velocity of the car = 20 meters/second north

Change in the velocity = final velocity - initial velocity

                                      =20 - 0

                                      = 20 meter/second

Thus, the change in the velocity would be 20 meters/second

Learn more about acceleration from here

brainly.com/question/2303856

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Im not too sure if I just dont understand but if something starts at rest, its not moving so Vi would be 0m/s and if the final velocity would be 20m/s North. Than the change would be 20m/s, its not asking for displacment so you don't need direction. I got my answer from doing Change in Velocity = Final velocity - Initial velocity

If the stone loses 10% of its speed in 10 s of grinding, what is the force with which the man presses the knife against the stone?

Answers

w1=200rpm*2pi/60=20.9rad/s

w2=200rpm-.10(200rpm)=180rpm
 
180rpm*2pi/60=18.8rad/s

a=(18.8-20.9)/10= -.21rad/s^2

I=1/2(28)(.15)^2
 I=.315kg*m^2
Torque= -.21(.315)=.06615 N*m
Friction force= -.06615/.15=-.441 N
Normal force of man=.441/.2= 2.205 N
 Final answer: -2.205 N

In a voltaic cell electrons flow from the anode to the cathode. true or false

Answers

True , In a voltaic cell, the anode is the electrode where oxidation occurs and electrons are produced. The cathode is the electrode where reduction occurs and electrons are consumed.

The electrons flow from the anode to the cathode through an external circuit, which generates an electric current. This flow of electrons is what produces the electrical energy in the cell.

In a voltaic cell, also known as a galvanic cell, a spontaneous redox reaction occurs, which results in the conversion of chemical energy into electrical energy. This redox reaction involves the transfer of electrons from one substance to another.

The electrons produced at the anode flow through the external circuit to the cathode. This flow of electrons is driven by the difference in electric potential between the anode and the cathode.

This potential difference is often referred to as the cell voltage or electromotive force (EMF) of the cell.

As the electrons flow through the external circuit, they produce an electric current, which can be used to power electrical devices.

Meanwhile, the redox reaction continues within the cell, with electrons being transferred from the anode to the cathode via an ionic bridge or salt bridge, which allows the movement of ions between the two half-cells to maintain charge neutrality.

Overall, the flow of electrons from the anode to the cathode through the external circuit is what produces the electrical energy in a voltaic cell.

To know more about electrons refer here

brainly.com/question/12001116#

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Why did most scientist reject wegeners theory for nearly a half century

Answers

He couldn't provide as much satisfactory explaining for the force that pushes or pulls the continents also because it contradicted their ideas about how mountains form.
I think they were also too skeptic to believe the ocean did move or pull apart, even today do you believe that the continents broke from one big flat plate, and that they pulled apart? They also wonder what large force would be responsible for the movement.

It was much later that evidences from plant and animal features that had similarity from two different planets came up that scientists began accepting the idea of continental drift.
And similar rock strata from two different opposite continents, showed similar rock strata.
All these evidences came up much later after Alfred Wengener.

So Alfred Wengener was honored Posthumously.

on a small planet, an astronaut uses a vertical force of 175 newton to lift an 87.5 kg boulder at constant velocity to height of 0.350 meter above the planet's surface. What is the magnitude of the gravitation field strenght on the surface of the planet

Answers


                                                         Weight =  (mass)  x  (gravity)

                                                          175 N  =  (87.5 kg) x (gravity)

Divide each side by  87.5 kg :      Gravity = (175 N) / (87.5 kg)

                                                                      =  2 m/s²

We don't care how far he lifted it.
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