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Naya [18.7K]
3 years ago
8

The efficiency of a machine is 80%? What does it mean?​

Physics
2 answers:
WITCHER [35]3 years ago
7 0

Answer:

efficiency is the ratio of the power ouput to the power input

Explanation:

It compares how much energy is used to do work versus how much is lost or wasted to the environment, the more efficient the machine, the less energy wasted.

KonstantinChe [14]3 years ago
4 0

Answer:

It means how much input work you put into the machine, which then becomes output from the machine. So you're putting 80% of work into the machinie. To find the efficency of a machine, it's output divided by input work.

Explanation:

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An insulated piston–cylinder device contains 5 l of saturated liquid water at a constant pressure of 150 kpa. an electric resist
Semmy [17]
At the initial state: v1 = vf = 0.001053 m 3 /kg, h1 = hf = 467.11 kJ/kg, and s1 = sf = 1.4336 kJ/kgK.
 The mass of the water is: m = V/v1 = 0.005/0.001053 = 4.7483 kg.
 To find the final state, we will use the First Law:
 Q12 = m(h2 - h1) for closed system undergoing a constant pressure process.
 h2 = 1Q2/m + h1 = 2200/4.7483 + 467.11 = 930.43 kJ/kg.
 At P2 = P1 = 150 kPa, this is a saturated mixture.
 hf = 467.11 kJ/kg, hfg = 2226.5 kJ/kg, sf = 1.4336 kJ/kgK, and sfg = 5.7897  kJ/kgK
 s2 = sf + sfg (h2 – hf )/hfg = 1.4336 + 5.7897(930.43 – 467.11)/2226.5 =   2.6384 kJ/kgK.
 The entropy change of water is:
 Delta Ssys= m(s2 – s1) = 4.7483(2.6384 – 1.4336) = 5.72 kJ/K. 

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3 years ago
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How and why does breathing rate increase during exercise
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4 years ago
When a car is traveling 120 km/h how many times more kinetic energy would it have than if it were
LekaFEV [45]

Answer: 9

Explanation:

Kinetic energy is the energy possessed by a moving object. It is measured in joules, and depends on the mass (m) of the object and the speed (v) by which it moves i.e K.E = 1/2 x mass x velocity^2

So, car is traveling 120 km/h

KE = 1/2x m x (120 km/h)^2

KE = 0.5 x m x 14400

KE1 = 7200m

So, car is traveling 40 km/h

KE = 1/2x m x (40 km/h)^2

KE = 0.5 x m x 1600

KE2 = 800m

Now, divide the value of kinetic energy obtained during 120 km/h by that obtained during 40 km/h

i.e 7200m / 800m

= 9

Thus, the kinetic energy will be 9 times more at a speed of 120 km/h than at 40 km/h

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3 years ago
4. What happens to the total resistance of a<br> parallel circuit when another resistor is added?
Dahasolnce [82]

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Explanation:

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