To squeeze a gas into a smaller space

Answers

Answer 1
Answer: To "compress" means to squeeze anything
into a smaller space, including a gas.

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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

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: 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}

Find the total displacement of a mouse that travels 1.0m north and then 0.8m south.

Answers

           In this case two vectors are colinear and they have an opposite orientation.
           N + ( - S ) = N - S = 1 m - 0.8 m = 0.2 m
           Answer:
           The total displacement is 0.2 m north.
 

Does a negative charge indicates a lack of free electrons in a body.

Answers

No. Electrons are negative, so if a body has negative charge is because it has excess of electrons.

When a craton is exposed at earth's surface, it is called a ________. when a craton is exposed at earth's surface, it is called a ________. caldera continental shield mid-ocean ridge plate transform fault region?

Answers

When a Craton is exposed at earth's surface, it is called a continental shield. Continental shield is any of the large stable areas of low relief in the Earth's crust that are composed of Precambrian Crystalline rocks. Shield areas are regarded as continental nuclei, the observation often being made that most continental shields are bordered by belts of folded rocks of post-Precambrian age.

How does is the terminal velocity of a feather different from the terminal velocity of an egg?

Answers

if under vacuum the terminal velocity of the egg and feather would be the same because only the acceleration due to gravity is only force acting on it. but at normal condition, their terminal velocity are different because to wind resistance and shape factor that will contribute resistance of an object to go down.

Answer:

The terminal velocities will be the same in a vacuum and different for the egg and further.

Explanation:

Thinking process:

The terminal velocity is the maximum velocity that an object can attain after overcoming the resistance caused by the atmosphere or air. In other words, the velocity equation is given as:

F_(net)  = D -W

where F is the net force,

D = Drag force

W = Weight of the object falling down.

The drag force increases by the increase with the square of the velocity like this:

W = C_(d) \frac{\rhoV^(2)A  } {2}

The terminal velocity is given by the equation:

V = Sqrt (2W/CdpA)

In the absence of friction, like a vacuum, the velocities are the same.

In the atmosphere, there is drag, and the velocities are different.

A container holding 1.2 kg of water at 20.0 °C is placed in a freezer that is kept at –20.0 °C. The water freezes and comes into thermal equilibrium with the interior of the freezer. a) How much heat is extracted from the water in thisprocess?
b) What is the minimum amount of electrical energy required bythe refrigerator to carry out this process if it operates betweenreservoirs at temperatures of 20.0 °C and -20.0 °C?

Answers

Answer:

(a) Q=556464\ J

(b) 556464 joule

Explanation:

Given:

  • mass of water, m_w=1.2\ kg
  • initial temperature of water, T_i=20^(\circ)C
  • final temperature of frozen water, T_f=-20{}^(\circ)C

The conversion of water of 20.0 °C to the ice of –20.0 °C will comprise of three steps:

  1. cooling of water to 0 °C Q_w
  2. formation of ice at 0 °C from the water of 0 °C Q_L
  3. further cooling of ice of 0 °C to -20 °C Q_i

We have,

  • Latent heat of fusion of ice, L=3.4* 10^5\ J.kg^(-1)
  • specific heat of water, c_w=4186\ J.kg^(-1).^(\circ)C^(-1)
  • specific heat of ice, c_i=2000\ J.kg^(-1).^(\circ)C^(-1)

(a)

Now, total heat lost in the process:

Q=Q_w+Q_L+Q_i

Q=m_w(c_w. \Delta T_w+L+c_i.\Delta T_i)

where:

\Delta T_i\ \&\ \Delta T_w = change in temperature of ice and water respectively.

\Rightarrow Q=1.2(4186* 20+3.4* 10^5+2000* 20)

Q=556464\ J is the total heat extracted during the process.

(b)

So, 556464 joule is the minimum electrical energy (by the law of energy conservation under no loss condition) required by refrigerator to carry out this process if it operates between the reservoirs at temperatures of 20.0 °C and -20.0 °C, because for a refrigerator to work in a continuous cycle it is impossible to transfer heat from a low temperature reservoir to a high temperature reservoir without consuming energy in the form of work. Here 556464 joule is the heat of the system to be eliminated.

Final answer:

The amount of heat extracted from the water involves the sum of heat lost as it cools and then freezes. The minimum energy needed by the refrigerator to do this is given by the formula for Carnot efficiency.

Explanation:

To answer these questions, we'll need to understand some fundamental principles of thermodynamics.

a) The heat Q taken from the water will be the sum of the heat released during cooling of the water until 0.0°C, and the heat released during freezing at 0.0°C. The heat loss as the water cools can be calculated using Q = mcΔt where m=mass of water, c=specific heat of water, and Δt=change in temperature. The heat loss as water freezes can be calculated using Q = mlf where lf is the latent heat of fusion. Adding these two quantities gives the total heat extracted.

b) The minimum energy needed by the refrigerator, W, is given by the Carnot efficiency formula, W = Q*(T_hot - T_cold)/T_hot, where T is in Kelvin. This would tell you how much energy the refrigerator needs to remove the heat from the water and cool it down to the freezer temperature.

Learn more about Thermodynamics here:

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