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pashok25 [27]
3 years ago
13

What is perfect machine?Why is this machine not possible in the real life?​

Physics
1 answer:
andrezito [222]3 years ago
5 0

Explanation:

The machine whose efficiency is 100% is known as perfect machine .This machine is not possible in real life because every machine is affected by the overcoming friction due to which is efficiency become less than hundred percent .

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A circuit consists of a 9.3-mH coil, a 16.0-V battery, a parallel combination of a 19-Ω resistor and a 6.0-Ω resistor, and a swi
Alla [95]

Answer:

τ = 0.00203 seconds

Explanation:

The time constant τ in a R-L circuit is given by

τ = L/R

First we have to find out the equivalent resistance of the circuit.

Since there is a parallel combination of 19 Ω and 6.0 Ω resistor

Req = 19*6/19+6

Req = 4.56 Ω

Now we can find out the time constant

τ = L/R

τ = 0.0093/4.56

τ = 0.00203 seconds

Therefore, the time constant of this circuit is 0.00203 seconds.

8 0
3 years ago
السؤال الرابع: حل المسألة الأتية:
defon

Answer:

Explanation:

i dont speak arbic so ill take the points

5 0
3 years ago
A person on a bicycle travels a distance of 12.5 km in 2.1 hrs, what was the speed of the person on the bicycle?
Leona [35]

Answer:

5.9 km/hour

Explanation:

divide 12.5 by 2.1 and the answer is 5.9

8 0
2 years ago
NEED HELP ASAP!!!!!!!!!!
stepan [7]

Answer:

*The same balloon put into the freezer would be smaller and shriveled.

* The volume decreases as the temperature decreases.

* using a hypothetical starting volume of 2 liters in the balloon at 42 degrees Celsius, we can use the equation V1/T1 =V2/T2

V2= 1.54 liters which proves when temperature decreases , volume decreases as well.

Explanation:

The volume increases as the temperature increases, and volume decreases as the temperature decreases.

using a hypothetical starting volume of 2 liters in the balloon at 42 degrees Celsius, we can use the equation V1/T1 =V2/T2

Change Celsius to kelvin by adding 273.

2 liters/ 315 K = V2/243 K

Cross multiply and then divide by 315 to find V2

2 liters x 243 K / 315 K = V2

The Kelvin cancels itself out.

486 liters /315=V2

V2= 1.54 liters.

This proves that when the temperature decreases , so does the volume.

3 0
2 years ago
How much work is done in lifting a 3 N cabbage 2 meters?
Usimov [2.4K]

Answer:

<h2>6 joules</h2>

Explanation:

The work done by an object can be found by using the formula

workdone = force × distance

From the question we have

workdone = 3 × 2

We have the final answer as

<h3>6 J</h3>

Hope this helps you

6 0
3 years ago
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