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belka [17]
3 years ago
11

A boy on a bicycle rides at 21.1m/s distance of 87.9m how long does it take

Physics
2 answers:
Svetllana [295]3 years ago
8 0

Answer is t=4,2 seconds

Due to

t=X/V

t=(87,9)/(21,1)

t=4.2 segs

Best regards

erastovalidia [21]3 years ago
7 0

4.2 seconds! Hope this helps

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Explain where you observe reflection, refraction, and absorption of light in your everyday activities
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Why is radiation often used to destroy cancer cells ?
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A potential difference of 107 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative r
sergij07 [2.7K]

Answer:

The workdone is  W = 1.712 *10^{-20 } \  J  

Explanation:

From the question we are told that

    The potential difference is  V  =  107 mV =  107 *10^{-3} \  V

Generally the charge on  Na^{+} is  Q_{Na^{+}} = 1.60 *10^{-19 } \  C

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=>     W = 1.60 *10^{-19 } *  107 *10^{-3}    

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8 0
3 years ago
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stealth61 [152]
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two circular loops of wire, each containing a single turn, have the same radius of 4.0 cm and a common center. the planes of the
REY [17]

The magnetic field at center of circular loops of wire is 3.78 x 10¯⁵ T.

We need to know about the magnetic field at the center of circular loops of wire to solve this problem. The magnetic field at the center can be determined as

B = μ₀ . I / 2r

where B is magnetic field, μ₀ is vacuum permeability (4π×10¯⁷ H/m), I is the current and r is radius.

From the question above, we know that:

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By substituting the parameter, we get

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B = 2.67 x 10¯⁵ T

Due to the perpendicular plane of loops, the total magnetic field at center will be

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Btotal = √(2(2.67 x 10¯⁵²))

Btotal = 3.78 x 10¯⁵ T

Find more on magnetic field at: brainly.com/question/7802337

#SPJ4

3 0
2 years ago
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