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7nadin3 [17]
3 years ago
12

Why can’t a real machine ever have 100% efficiency

Physics
1 answer:
Harman [31]3 years ago
4 0

Answer:

Almost all machines require energy to offset the effects of gravity, friction, and air/wind resistance. Thus, no machine can continually operate at 100 percent efficiency.

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The amount of work done by two boys who apply 200 N of force in an
Aleksandr [31]

The amount of work done by two boys who apply 200 N of force in an unsuccessful attempt to move a stalled car is 0.

Answer: Option B

<u>Explanation: </u>

Work done is the measure of work done by someone to push an object from its present position. We can also define work done as the amount of forces needed to move an object from its present position to another position. So the amount of work done is directly proportionate to the product of forces acting on the object and the displacement of the object.  

           \text { Work done }=\text { Force } \times \text { displacement }

So in this present case, as the two boys have done an unsuccessful attempts to push a stalled car so that means the displacement of the car is zero as there is no change in the position of the car. But they have applied a force of 200 N each. So the amount of work done will be

           \text { Work done }=200 \mathrm{N} \times 0=0

Thus, the amount of work done by two boys will be zero due to their unsuccessful attempt to move a stalled car.

8 0
3 years ago
What statements best describe magnets?
3241004551 [841]

Answer:

they stick together when they get close

7 0
3 years ago
Whereas the vast majority of astrophysicists support the big bang theory, many nonscientists consider the theory to be controver
lubasha [3.4K]

Answer:

Religion

Explanation:

Religion is a big factor. Many people believe that the Big Bang DID happen while some believe it to be incorrect due to religious beliefs. I can guarantee if you ask people on the street about the Big Bang, someone will say something about religion. The Theory goes against every religions beliefs as to how the universe was created.

8 0
3 years ago
If the size of the charge value is tripled for both of twopoint charges maintained at a constant separation, the mutual forcebet
ch4aika [34]

Answer:

a) 9.0

Explanation:

The force between two point charges, obeys Coulomb's Law, which can be written as follows:

F =\frac{k*q1*q2}{(r12)^{2} }

As it  can be seen, if the separation between the charges remains the same, the new value of the force will be directly proportional to the product of the charges.

If both charges are tripled, the mutual force between them will be changed in a factor equal to 3.0*3.0 = 9.0

8 0
3 years ago
A 56.88 kg diver hits the water going 10 m/s. From what height in meters platform did she jump?
Otrada [13]

Answer:

its 10

Explanation:

if you search it up you will see

8 0
3 years ago
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