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stellarik [79]
3 years ago
5

Power is calculated by multiplying voltage by

Physics
1 answer:
butalik [34]3 years ago
5 0

If you're calculating the power of an athlete who is lifting weights,
or the power of a windmill that is pumping water from a well, or
the power of two horses turning millstones, then those electrical
units won't help at all.

But if you happen to be calculating the power delivered to an
electrical circuit or dissipated by an electrical device, then you
can use ...

                (voltage) times (current)
or
                (voltage)² divided by (resistance)
or
                (current)² times (resistance) .

The choice just depends on which quantities you know
or can easily measure.  

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Jumping up before the elevator hits. After the cable snaps and the safety system fails, an elevator cab free-falls from a height
noname [10]

Answer:

a)   I = 2279.5 N s , b) F = 3.80 10⁵ N, c)   I = 3125.5 N s  and d)  F = 5.21 10⁵ N

Explanation:

The impulse is equal to the variation in the amount of movement.

    I =∫ F dt = Δp

     I = mv_{f} - m v₀

Let's calculate the final speed using kinematics, as the cable breaks the initial speed is zero

   v_{f}² = V₀² - 2g y

   v_{f}² = 0 - 2 9.8 30.0

   v_{f} = √588

   v_{f} = 24.25 m/s

a) We calculate the impulse

   I = 94 24.25 - 0

   I = 2279.5 N s

b) Let's join the other expression of the impulse to calculate the average force

   I = F t

  F = I / t

  F = 2279.5 / 6 10⁻³

  F = 3.80 10⁵ N

just before the crash the passenger jumps up with v = 8 m / s, let's take the moments of interest just when the elevator arrives with a speed of 24.25m/s down and as an end point the jump up to vf = 8 m / n

c)     I = m v_{f} - m v₀

       I = 94 8 - 94 (-24.25)

       I = 3125.5 N s

d)     F = I / t

       F = 3125.5 / 6 10⁻³

       F = 5.21 10⁵ N

7 0
3 years ago
Please answer this question.
Len [333]

Answer:

Explanation:

need more work

6 0
3 years ago
when forces on an object are acting in the same direction, how do you add them together to find the net force?
AysviL [449]
If two forces act on an object in the same direction, the net force is equal to the sum of the two forces
4 0
3 years ago
Is acceleration a <br><br> vector,<br> scalar,<br> both,<br> neither
NemiM [27]

Answer: vector yes

Explanation:

Acceleration is a vector, and thus has a both a magnitude and direction. Acceleration can be caused by either a change in the magnitude or the direction of the velocity.

5 0
3 years ago
How much work is done by the force of gravity when the book is released?
Naya [18.7K]

Answer:

please see picture

Explanation:

and mark me brainliest

3 0
3 years ago
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