If the rotor area becomes two times power available in the wind becomes four times. Select one:

Q: What is inclined plane?

A: Given; Define the inclined plane and its use,  with two examples where it is used ?

Q: ne make it to the second shelf if her accelerati = does she land?

A: A GIVEN acceleration a = 2.5 m/s2

Q: A solid cone with height 5 m5 m and base with radius 2.5 m2.5 m is built using a lightweight…

A: Height of the cone (h)=5m The radius of the cone (r)= 2.5m The density of the material used =…

Q: On March 3, 2020 an EF3 (Enhanced Fujita) tornado passed through Nashville, TN causing much damage.…

A: The radius of the tornado is, r=549 m2=274.5 m The velocity of the tornado is, v=136…

Q: A river flowing steadily at a rate of 175 m3/s is considered for hydroelectric power generation. It…

A:

Q: Calculate energy available in 10 Kg wind, if the power available at the rotor of a wind turbine is…

A: Given :    Power, P = 313 kW = 313 x 103 W    Diameter, D = 82 m    Air density, ρ = 1.23 kg/m3…

Q: A road that rises 1 ft for every 100 ft traveledhorizontally is said to have a 1% grade. Portions of…

A: When the road rises 1 ft for every 100 ft traveled then the road is said to have 1 % grade. So if…

Q: Calculate energy available in 15 Kg wind, if the power available at the rotor of a wind turbine is…

A: Given: The mass of wind is m=15 kg. The power is P=699 kW. The diameter of rotor is D=88 m. The air…

Q: particular Zamboni can clear ice at a rate of 8 m^2/s. Convert this rate to km^2 / h

A: 1 km = 1000 m  1 m = (1/1000) km  1 hour = 3600 s  1 s = (1/3600) h

Q: Write TRUE or FALSE Lift force in wind turbine is an aerodynamic force which acts in the direction…

A: Turbine uses the mechanical energy to generate other form of energy. There are mainly two type of…

Q: Calculate energy available in 14 Kg wind, if the power available at the rotor of a wind turbine is…

A:

Q: Calculate energy available in 17 Kg wind, if the power available at the rotor of a wind turbine is…

A: Given : m = 17 kg P = 588 kW = 588 x 103 W D = 95 m ρ = 1.23 kg/m3 Cp = 0.35

Q: where will you weigh more? at sea level or on a plane, over water or an ore deposit, or a salt…

A: At sea level, you will weight more than other mentioned places, because gravity is stronger at the…

Q: What should you do if your in bed and when a earthquake strikes?

A: An earthquake is the shaking of Earth’s surface resulting from a sudden release of stored energy in…

Q: The speed of the river flow is affected by the slope and the volume of water   TRUE OR FALSE

A: Answer:-  True    The speed of the river flow is affected by the slope and the volume of water is…

Q: Why do boats need anchors if ocean waves do not carry matter forward?

A:

Q: the interior of a submarine located at a depth of 45 meters is maintained at normal atmospheric…

A:

Q: Calculate energy available in 14 Kg wind, if the power available at the rotor of a wind turbine is…

A: Given :            mass of density m = 15kg            power of wind turbine = 673kW…

Q: A wind is blowing at a speed of 45 km/h in a direction 34° North of East. The northward (Y).…

A: Y component is given by  Vsinθ

Q: How much change in the power of wind will take place if wind velocity becomes 3 times O 27 times O 9…

A:

Q: In an earthquake, why it is not the sturdiest buildings that remain standing but the smartest ones?

A: When earthquake occurs, the shock waves of varying frequency is produced depending upon the…

Q: water emerges in a continuous stream out of a hole 5 mm in diameter in the base. Calculate: (1) the…

A:

Q: -5- n region -10- www -- --

A: The potential on plate c is 10 volt according to diagram 1  magnitude of electric field in region 2…

Q: Calculate the factor for the increase in wind speed if the original wind speed was taken at a height…

A: Given , initial height z1 = 10m Power low exponent ,α = 0.14   Power law gives  v2v1=z2z1α where v2…

Q: How Gravity generates stresses  ?

A: We have to answer that How Gravity generates stresses?

Q: How much change in the power of wind will take place if wind velocity becomes 4 times and blade…

A: Given data: The change in velocity is v2=4v1. The change is blade length is r2=5r1.

Q: d=96.0 m River Current W=50.0 m

A: Given Data : Distance, d=x=96m Perpendicular distance, W=s=50m

Q: 10 kip 5 kip 3 kip

A:

Q: A hallow shaft is stronger than a solid shaft made of same material.

A: A shaft is a rotating element which is incorporated in machines for power transmission from one part…

Q: The ploughing of field helps in the conservation of water in the soil. Explain.

A: Capillaries will be formed in soil which is not ploughed for a long time. Water inside the soil will…

Q: What is the Wheatstone bridge and where is it used?

A: The combination of four resistances with null deflection is called Wheatstone bridge and the circuit…

Q: Why is cement not needed between the stone blocks of an arch that has the shape of an inverted…

A: Catenary arch withstands its weight by redirecting the vertical force of gravity into compression…

Q: What is cause of surface tension?

A:

Q: Why doesn’t a hummingbird soar like an eagle and an eagle flap its wings like a hummingbird?

A: The wings size of a hummingbird is smaller than the wing size of an eagle, so hummingbird can flap…

Q: Mention the advantages of horizondal Axis wind turbine.

A: There are many advantages of horizontal axis wind turbine. Some of them are mentioned in next step.

Q: What fraction of the iceberg lies below the water level?

A: According to Archimedes principle Bouyant force = weight of liquid displaced

Q: A wind is blowing at a speed of 20 km/h in a direction 17° North of East. The eastward (X) component…

A: If v be the velocity of wind and θ be the angle then the component of the wind velocity will be=…

Q: A legendary Dutch boy saved Holland by plugging a hole of diameter 1.20 cm in a dike with his…

A: Given data: Diameter of hole is, d=1.20 cm=1.20×10-2 m. Depth of hole below sea level is, h=2.00 m.…

Q: A wind is blowing at a speed of 20 km/h in a direction 37° North of East. The northward (Y)…

A: (b) Y component of velocity of wind is                V= 12.03km/hr

Q: What are the limitations of extracting energy from—(a) the wind? (b) waves? (c) tides?

A: a) In the case of wind: Wind streaming with an adequate speed as a result wind is not accessible all…

Q: As height increases, so does...

A: Height is related to the potential energy of an object. increasing height is the result of gaining…

Q: Calculate energy available in 5 Kg wind, if the power available at the rotor of a wind turbine is…

A: Given : m = 5 kg P = 648 kW = 648 x 103 W D = 84 m ρ = 1.23 kg/m3  Cp = 0.42

Q: In wind power calculations, wind speed is expressed in Km/Hr. Select one: True O False

A: Wind power is given by  P=12ρAv2

Debye Theory of Solids

In solid-state physics, debye theory is used to estimate the phonons contributing to the specific heat capacity in a solid. It explains that the specific heat is a consequence of the vibrations of the atomic lattice of the solid, which is in contrast to the Einstein model. In the Einstein model, solids are treated as independent, non-interacting quantum harmonic oscillators. This model clearly explains the low-temperature dependence of the heat capacity, which is proportional to T3. This is known as Debye T3 law.