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NeX [460]
3 years ago
7

A machine can never be 100% efficient because some work is always lost due to what?

Physics
2 answers:
katrin [286]3 years ago
8 0

A machine can never be 100% efficient because some work is always lost due to the lack of materials or equipment that would convert work by 100%. It follows the second law of entropy. The ideal engine is known as Carnot’s engine having a 100% efficiency. So far, no engine has ever gotten to 100%.

kari74 [83]3 years ago
8 0

Answer:

Friction

Explanation:

Ik cuz i took tha test, i wouldn't lie to fellow students <3

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Two pans of a balance are 24.1 cm apart. The fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest
Citrus2011 [14]

As we know that fulcrum is shifted to one side by 1.33 cm

so here let say left side mass is m1 while on other side mass is m2

so we will have

m_1g (24.1 - 1.33) = m_2 g(24.1 + 1.33)

m_2 = 0.895 m_1

now in order to find the percentage we have

percentage = \frac{m_1 - m_2}{m_1}\times 100

percentage = (1 - 0.895)\times 100

percentage = 10.5%

so it is 10.5 % less mass

8 0
2 years ago
In a given circuit, the supplied voltage is 1.5 volts. One resistor is 3 ohms and the other is 2 ohms. Use Ohm's law to determin
ozzi

You haven't said whether the two resistors are connected
in series or in parallel.  It makes a difference.

--  If they are in series, then their combined effective resistance is

                 (3 + 2) = 5 ohms.

Current in the circuit is    (voltage)/(resistance) = 1.5/5 = 0.3 Amp.


--  If they are in parallel, then their combined effective resistance is

               (3 x 2) / (3 + 2) = (6/5) = 1.2 ohms.

Current in the circuit is  (voltage)/(resistance) =  1.5/1.2 = 1.25 Amp.
 
5 0
2 years ago
Read 2 more answers
HELP MEH QUICK PLEASE
lozanna [386]

Answer:

D) a Battery

Explanation:

The best real-life example of direct current is a battery. Batteries have positive and negative terminals on a battery, the electrons in the wires will begin to flow to produce a current.

6 0
2 years ago
How should you plan to excercise if you want to remain healthy past the age of 65
gayaneshka [121]
Run,karate,aerobic exercise
5 0
1 year ago
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Small, slowly moving spherical particles experience a drag force given by Stokes' law: Fd = 6πηrv where r is the radius of the p
Dominik [7]

Answer:

Explanation:

At the time of a body achieving terminal velocity, the drag force becomes equal to the weight of the body less the buoyant force by the surrounding medium which can be represented by the following equation

\frac{4\pi\times r^3(d-\rho)}{3} =6\pi\times n\times r\times v

Where r is radius of the body , d is density of the material of the body σ is density of the medium and n is coefficient of viscosity of the medium and v is terminal velocity.

Simplifying

v = \frac{2\times r^2(d-\rho)}{9\times n}

Assuming the value of density of air as 1.225 kg/m³ and putting other given values in the formula we get

v = [tex]\frac{2\times (1.2\times10^{-5})^2(2182-1.225)}{9\times 1.8\times10^{-5}}[/tex]

v = 387 x 10⁻⁵ m/s

Terminal velocity = 387 x 10⁻⁵ m/s

Time taken to fall a distance of 100 m

= \frac{100}{387\times10^{-5}}

= 2.6 x 10⁴ s.

5 0
2 years ago
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