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4 years ago

Which statement best compares momentum and kinetic energy?

Physics

2 answers:

I am Lyosha [343]4 years ago

7 0

Answer:

Both variables depend on mass and velocity but momentum is a vector quantity while kinetic energy is a scalar quantity.

Explanation:

Momentum is directly proportional to the mass and velocity. To a greater mass or velocity a greater momentum while Kinetic Energy is inversely proportional to the object's mass. The smaller the mass the greater the Kinetic Energy.

Gnesinka [82]4 years ago

5 0

Are there a list of things to choose from, without that its hard to answer

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Matter is anything that takes up space and has mass. O A. True O B. False

nadezda [96]

Answer:

A.true

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3 years ago

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Which is a form of kinetic energy?

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According to Galileo, this quantity is not needed to keep a body in motion under ideal conditions.

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3 years ago

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The final stages of a star's life depend on its mas. true or false?

Diano4ka-milaya [45]

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4 years ago

A wind turbine is rotating at 15 rpm under steady winds flowing through the turbine at a rate of 42,000 kg/s. The tip velocity o

zzz [600]

Answer:

a) 5.22 m/s

b) 31.4 %

Explanation:

f = rotating speed = 15 rpm = 15/60 =0.25 rps

m = Mass flow rate of air = 42000 kg/s

v = Tip velocity = 250 km/h = 250/3.6 = 69.44 m/s

W = Work output = 180 kW

A = Swept area of wind turbine

r = Radius of wind turbine

η = Efficiency

$r=\frac{v}{2\pi f}\\\Rightarrow r=\frac{250\div 3.6}{2\pi 0.25}=\frac{250}{1.8\pi}$

$A=\pi r^2\\\Rightarrow A=\pi\left(\frac{250}{1.8\pi}\right)^2\\\Rightarrow A=\left(\frac{250}{1.8}\right)^2\frac{1}{\pi}$

$m=\rho V\\\Rightarrow m=\rho vA\\\Rightarrow v=\frac{m}{\rho A}\\\Rightarrow v=\frac{42000}{1.31 \left(\frac{250}{1.8}\right)^2\frac{1}{\pi}}\\\Rightarrow v=5.22\ m/s$

∴ The average velocity of the air is 5.22 m/s

$E=m\frac{v^2}{2}=42000\frac{5.22^2}{2}\\\Rightarrow E=572538.92$

$\eta=\frac{W}{E}=\frac{180000}{572538.92}\\\Rightarrow \eta =0.314$

∴ Conversion efficiency of the turbine is 0.314 or 31.4 %

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3 years ago

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