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Blizzard [7]
3 years ago
11

Which term defines the amount of mechanical work an engine can do per unit of heat energy it uses? A. specific heat B. conductiv

ity C. thermal expansion D. efficiency
Physics
1 answer:
KengaRu [80]3 years ago
4 0

Answer:

Efficiency

Explanation:

  • The amount of mechanical work an engine can do per unit of heat energy it uses is called its efficiency.
  • It is also defined as the output divided by the total electrical power consumed.
  • In terms of heat, efficiency of engine is given by :

\eta=1-\dfrac{Q_o}{Q_i}

Q_o\ and\ Q_i are output heat and input heat respectively.

Hence, the correct option is (d) "efficiency"

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The sound level of one person talking at a certain distance from you is 61 dB. If she is joined by 5 more friends, and all of th
Lady_Fox [76]

Answer:

Explanation:

For sound level in decibel scale the relation is

dB = 10 log I / I₀ where I₀ = 10⁻¹² and I is intensity of sound whose decibel scale is to be calculated .

Putting the given values

61 = 10 log I / 10⁻¹²

log I / 10⁻¹² = 6.1

I = 10⁻¹² x 10⁶°¹

=10^{-5.9}

intensity of sound of 5 persons

I=5\times 10^{-5.9}

dB=10log\frac{5 X 10^{-5.9}}{10^{-12}}

= 10log 5 x 10⁶°¹

= 10( 6.1 + log 5 )

= 67.98

sound level will be 67.98 dB .

4 0
3 years ago
Which three quantities can be used to calculate acceleration?
ikadub [295]
The correct option will be
D. Time, initial velocity and final velocity
The Formula can be written as,
Acceleration=Final velocity-Initial Velocity/Time
5 0
3 years ago
the half-life of carbon-14 is 5,730 years. After 11,460 year, how much of original carbon-14 remains?
Inessa [10]

Via the half-life equation:

A_{final}=A_{initial}(\frac{1}{2})^{\frac{t}{h}}

Where the time elapse is 11,460 year and the half-life is 5,730 years.

A_{final}=A_{initial}(\frac{1}{2})^\frac{11460}{5730} \\\\A_{final}=A_{initial}\frac{1}{4} \\\\A_{final}=\frac{1}{4}A_{initial}

Therefore after 11,460 years the amount of carbon-14 is one fourth (1/4) of the original amount.

6 0
3 years ago
Two waves are superposed. one wave has an amplitude of 5 cm, and other has an amplitude of 4 cm. What is the resultant amplitude
Vsevolod [243]
If both waves have the same wavelength, then the amplitude of
their sum could be anything between 1 cm and 9 cm, depending
on the phase angle between them.

If the waves have different wavelengths, then the resultant is a beat
with an amplitude of 9 cm.
4 0
3 years ago
Which dog has the most kinetic energy? A. A dog of mass 12 kg running with speed 6 m/s B. A dog of mass 10 kg running with speed
Nonamiya [84]

Answer:

A

Explanation:

KE = 1/2 m v^2

     the greatest is  A

5 0
2 years ago
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