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2 years ago

What is the power of a machine that pushes with a force of 3 n for a distance of 9 m in 8 s?

1 answer:

4 0

The work done by the machine is equal to the product between the force applied and the distance over which the force is applieds, so in this case:
$W=Fd=(3 N)(9 m)=27 J$

And the power of the machine is equal to the ratio between the work done by the machine and the time taken:
$P= \frac{W}{t}= \frac{27 J}{8 s}=3.38 W$

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An engine has an energy input of 125j and 35 j of that energy is transformed into useful energy

Tatiana [17]

The engine's efficiency is (35J)/125J) = 28% .

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5 0

2 years ago

A 0.49-kg cord is stretched between two supports, 7.8m apart. When one support is struck by a hammer, a transverse wave travels

katovenus [111]

To solve this problem we will apply the laws of Mersenne. Mersenne's laws are laws describing the frequency of oscillation of a stretched string or monochord, useful in musical tuning and musical instrument construction. This law tells us that the velocity in a string is directly proportional to the root of the applied tension, and inversely proportional to the root of the linear density, that is,

$v = \sqrt{\frac{T}{\mu}}$

Here,

v = Velocity

$\mu$ = Linear density (Mass per unit length)

T = Tension

Rearranging to find the Period we have that

$T = v^2 \mu$

$T = v^2 (\frac{m}{L})$

As we know that speed is equivalent to displacement in a unit of time, we will have to

$T = (\frac{L}{t}) ^2(\frac{m}{L})$

$T = (\frac{7.8}{0.83})^2 (\frac{0.49}{7.8})$

$T = 5.54N$

Therefore the tension is 5.54N

8 0

2 years ago

Australia has 3 a’s but all pronounced differently how?

kobusy [5.1K]

BecausE the first 'a' is used with a 'u' making a "ahh" sound

The second 'a' isn't paired with any other vowels so it's sound is a strong A sound

And the 'a' at the end is paired with an 'i' in front of it making an "ee-uhh" sound

plz rate me lol i tried <3

8 0

3 years ago

52. In an ideal gas the molecules possess

LuckyWell [14K]

Answer:

b. Only kinetic energy

Explanation:

The potential energy is associated with intermolecular forces and is presumed to be zero in an ideal gas where the only molecular interactions are the perfectly elastic collisions between molecules. Therefore the internal energy of an ideal gas is entirely kinetic energy.

5 0

2 years ago

In the morning, John drove to his mother's house in the village at an average speed of 60 kilometers per hour. When he was going

Nuetrik [128]

Answer:

$\frac{v2+v1}{2}$ , where v2= velocity at the end and v1= velocity in the beggining

Explanation:

Asuming that v=K, where k= velocity lower than 60[km/h] we can make an equation for a average speed to entire trip as follows:

The equation of average is: $\frac{v2+v1}{2}$ , where v2= velocity at the end and v1= velocity in the beggining. Where v1=60 [km/h] becouse is the average velocity of half trip, and v2=k.

That means that jhon´s average speed decreses

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3 years ago