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3 years ago

13

The world speed record on water was set on October

1 answer:

Luda [366]3 years ago

8 0

Answer: Remember speed is distance divided by time, so if he travels 1000 m in 7.045 s, his speed is

(1000 m)/(7.045 s) = 141.9 m/s.

Note there are 1609 metres in a mile, or 1 mi = 1609 m, so m = 1/1609 mi, or

141.9/1609 mi/s = 0.08822 mi/s. Now, note that 1 h = 3600 s, so the speed is

0.08822*3600 mi/h = 317.6 mi/h.

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(b) 0.389 T

Solution:

As per the question:

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Hall emf, $V'_{Hall} = 69\ mV = 0.069\ V$

Now,

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Now, the expression for the electric field is given by:

$E_{Hall} = Bv_{d}sin\theta$ (1)

And

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Thus eqn (1) becomes

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where

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(b) When $\theta = 60^{\circ}$

$B = \frac{0.069}{0.2\times sin60} = 0.398\ T$

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