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seropon [69]
3 years ago
15

If you exert a force of 51 n to walk 6 m up a flight of stairs in 9 seconds, how much power do you use? answer in units of w.

Physics
1 answer:
Ratling [72]3 years ago
4 0
P=W/T
=51*6/9

=34 watt
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A parallel-plate capacitor initially has a potential difference of 400 V and is then disconnected from the charging battery. If
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C = Q/ΔV

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ΔV = Q/C

We also know the capacitance of a parallel-plate capacitor is given by:

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ΔV = Qd/(κε₀A)

We assume the stored charge and the area of the plates don't change. Then if we double the plate spacing, i.e. we double the value of d, then the potential difference ΔV is also doubled.

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It is August 1st and you are at a Science Camp in Florida. During an outdoor science quiz, you are asked to identify the tempera
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3 years ago
A person driving her car at 48 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow
trasher [3.6K]

Answer:

She must stop the car  before interception, distance traveled 12.66 m

Explanation:

We will take all units to the SI system

Vo = 48Km / h (1000m / 1Km) (1h / 3600s) = 13.33 m / s

V2 = 70 Km / h = 19.44 m / s

We calculate the distance traveled before stopping

X = Vo t + ½ to t²

Time is what it takes traffic light to turn red  is t = 2.0 s

X = 13.33 2 + 1.2 (-7) 2²

X = 12.66 m

It stops car before reaching the traffic light turning to red

Let's analyze what happens if you accelerate, let's calculate the acceleration of the vehicle

     V2 = Vo + a t2

      a = (V2-Vo) / t2

      a = (19.44-13.33) /6.6

      a = 0.926 m / s2

This is the acceleration to try to pass the interception, now let's calculate the distance it travels in the time the traffic light changes from yellow to red (t = 2.0 s)

X = Vo t + ½ to t²

X = 13.33 2 + ½ 0.926 2²

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Since the vehicle was 30 m away, the interception does not happen

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3 years ago
What two factors determine the amount of friction there will be between objects?
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Answer:

the two factors are the mass of the objects and the coefficient of friction between them

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