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jekas [21]
3 years ago
8

4

Physics
1 answer:
Svetlanka [38]3 years ago
6 0

Answer:

Speed of wave = 2.5 m/s

Explanation:

Given:

Time taken by wave = 6 second

Height (Distance) of wave = 15 meter

Find:

Speed of wave

Computation:

⇒ Speed = Distance / Time taken

⇒ Speed of wave = Height (Distance) of wave / Time taken by wave

⇒ Speed of wave = 15 / 6

Speed of wave = 2.5 m/s

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Which type of heating system is often used to heat many buildings from a central location
MakcuM [25]
Central heating is often used in cold climates to heat private houses and public buildings. Such a system contains boiler, furnace, heat pump to heat water, steam or air, all in a central location such as furnace room in a home or a mechanical room in a large building. The use of water as the heat transfer medium is known as hydronics.
3 0
3 years ago
The atmosphere pressure can support mercury in a tube, which the upper end is closed, up to 0.76 meter. If the mercury is replac
Leni [432]

Answer:

Maximum height the atmosphere pressure can support the

water=10.336 m

Explanation:

We know that ,

Pressure = h\cdot\rho\cdot g

Case 1 - Mercury in the tube

Density\ of\ mercury =\rho_1\\and\ height\ attained\ for\ mercury\ column = h_1

Case 2 - Water in the tube

Density\ of\ water =\rho_2\\and\ height\ attained\ for\ water\ column = h_2

Since atmospheric pressure is same

.P=h_1\cdot\rho_1\cdot g = h_2\cdot\rho_2\cdot g

or,  h_2=\frac{h_1\rho_1}{\rho_2}

Given\ h_1= 0.76\  m,\rho_1=13.6\cdot\rho_2

∴ h_2=0.76\cdot13.6=10.336\ m

Hence height of the water column =10.336 m

6 0
4 years ago
How does a coal-fired power plant use the energy in coal to produce electricity?
kakasveta [241]

Answer:

Answer is in explanation

Explanation:

A coal-fired power plant also known as steam power plant or thermal power plant is a generating station that converts heat energy of coal combustion into electrical energy. In a coal-fired power plant, steam coal, also known as thermal coal serves as the boiler's fuel.

Coal is collected, transported by road or rail to the power plant and stored in coal storage plant. Excess coal is stored in case of coal shortages, failure of transportation system, emergency outages or high electricity demand. From the coal storage plant, coal is fed to a crusher (or pulverizer or mill) through a conveyor. Inside the crusher, the coal is pulverized (crushed or milled) into fine powder. This increases the surface area and allows it to burn more quickly without using large quantity of hot air. The powdery coal is blown into the combustion chamber of a boiler then mixed with hot air where it is burnt at high temperature. After complete combustion of coal, ash produced is removed and  delivered to ash storage plant for disposal. The combustion reaction inside the boiler produces the heat energy needed to boil water in the pipes into steam at high temperature and pressure. The steam produced in the boiler is wet and is passed through a super-heater  where it is dried and super-heated.

The super-heated steam is passed into a steam turbine (containing thousands of propeller-like blades) through main valve. The heat energy from the steam is then converted to mechanical energy. The steam causes the turbine shaft to rotate at high speed by pushing the blades of the turbine. The rotating turbine drives the shaft of a generator mounted at one end of the turbine. Mechanical energy from the turbine is converted to electrical energy by the generator. When this generator is rapidly rotated in a strong magnetic field, electricity is generated. The electricity generated is stepped up into higher voltages and transmitted to power stations where it is stepped down into lower voltages for industrial and domestic usage. Steam exhausted  from the turbine is condensed by a condenser (natural or artificial). The condensed water from the condenser is fed back to the boiler to be heated once again as the cycle continues. This helps in improving the overall efficiency of the plant.

7 0
3 years ago
If a car with a mass of 1,200 kg traveling westward at 30 m/s is
forsale [732]

The net force acting on the car is equal to -12000 Newton.

<u>Given the following data:</u>

  • Mass = 1,200 kg
  • Initial velocity = 30 m/s.
  • Final velocity = 0 m/s (since the car came to a stop).
  • Time = 3 seconds.

To determine the net force acting on the car:

<h3>How to calculate the net force.</h3>

Mathematically, the net force acting on the car is given by Newton's Second Law of Motion:

F = \frac{m(v\;-\;u)}{t}

<u>Where:</u>

  • m is the mass.
  • t is the time.
  • u is the initial velocity.
  • u is the final velocity.

Substituting the given parameters into the formula, we have;

F = \frac{1200 \times (0\;-\;30)}{3}\\\\F = \frac{1200 \times (-30)}{3}\\\\F = \frac{-36000 }{3}

Net force = -12000 Newton.

Read more on net force here: brainly.com/question/1121817

5 0
2 years ago
In order to make an electric current flow it is necessary to have
ASHA 777 [7]
In order to make an electric current flow it is necessary to have a source of the current or source of free electrons and also the circuit should be a close one or complete. When there is a break in a circuit, no current would flow in the whole system. 
8 0
3 years ago
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