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Serjik [45]
3 years ago
5

Ethan is using a machine to mix cement. The work input is 10 and the work output is 8. What is the efficiency of the

Physics
1 answer:
Arturiano [62]3 years ago
4 0

Efficiency or \eta is calculated by formula: \eta=\frac{W_{output}}{W_{input}} where \eta\leq1 also efficiency has no unit.

Now put in the data and calculate the efficiency.

\eta=\frac{8}{10}=\boxed{0.8}

The efficiency of the machine is 0.8

If you want to get percentage just multiply by 100 and you get 80%

Hope this helps.

r3t40

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The energy levels of a quantum harmonic oscillator are given by En = n + 1 2 ¯h ω where 2π ¯h = h and h is Planck’s Constant. Th
PolarNik [594]

Answer:

2πc/w

Explanation:

To find the wavelength you take into account the difference in energy of two adjacent states n+1 and n:

E_{n+1,n}=\hbar \omega((n+1)+\frac{1}{2})+\hbar \omega(n+\frac{1}{2})\\\\E_{n+1,n}=\hbar \omega(1)

hbar = h/2π

this energy is also the energy of an emitted photon in the transition, that is:

E_{\lambda}=h\frac{c}{\lambda}   (2)

you equal the equations (1) and (2) and compute the wavelength:

E_{\lambda}=E_{n+1,n}\\\\h\frac{c}{\lambda}=\frac{h}{2\pi}\omega\\\\\lambda=\frac{2\pi c}{\omega}

hence, the wavelength of the emitted photon is 2πc/w

5 0
3 years ago
What is the theory of punctuated equilibrium answers?
kherson [118]

The theory of punctuated equilibrium states that is a species appear in a fossil record, they will become stable over time and can show little changes in evolution as time goes by. An example would be the feline creatures. Although cats and tigers have a different structure in their body, the facial structure and the way they hunt are similar.

3 0
3 years ago
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What is the potential energy of a 2500 g object suspended 5 kg above the earth's surface?
Alinara [238K]

Answer:

potential \: energy = mgh \\  = ( \frac{2500}{1000} ) \times 10 \times 5 \\  = 125 \: newtons

if height is 5 m

8 0
3 years ago
Biologists think that some spiders "tune" strands of their web to give enhanced response at frequencies corresponding to those a
Nat2105 [25]

Answer:

Explanation:

Given

diameter d=20 \mu m

density \rho =1300 kg/m^3

frequency \nu =150 Hz

Length of silk strand L=14 cm

Velocity in the string is as follows

\nu =\sqrt{\frac{T}{\mu }}

The expression for Fundamental Frequency

f=\frac{\nu }{2l}

f=\frac{1}{2l}\times \sqrt{\frac{T}{\mu }}

f=\frac{1}{2l}\times \sqrt{\frac{T}{\frac{m}{l}}}

f=\frac{1}{2l}\times \sqrt{\frac{Tl}{\rho V}}

Squaring

f^2=\frac{1}{4l^2}\times \frac{Tl}{\rho V}

T=4\rho \cdot A\cdot l^2\cdot f^2

T=4\times 1300\times \frac{\pi }{4}(20\times 10^{-6})^2\times (0.14)^2\times 150^2

T=7.2\times 10^{-4} N

8 0
3 years ago
Temperature of a substance is proportional to the average kinetic energy of the motion of the molecules of that substance.
MrRissso [65]
True, according to the Kinetic Molecular Theory.
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3 years ago
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