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NikAS [45]
3 years ago
8

The Kentucky Derby is a 1¼ mile race. Mandaloun ran it in 1.52 minutes. Hot Rod Charlie ran at a speed of .79 miles per minute.

Who won the race?
Physics
1 answer:
artcher [175]3 years ago
6 0

Answer:

Mandaloun won the race.

Explanation:

First, we will calculate the time taken by the Hot Rod Charlie:

s = vt\\t = \frac{s}{v}

where,

t = time taken by Hot Rod Charlie = ?

s = distance covered = 1.25 miles

v = speed of Hot Rod Charlie = 0.79 miles/min

Therefore,

t = \frac{1.25\ miles}{0.79\ miles/min} \\t = 1.58 min

Since Hot Rod Charlie took more time (1.58 min) than the Mandaloun (1.52 min).

<u>Therefore Mandaloun won the race.</u>

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The given statement"If the pressure of a gas sample is quadrupled and the absolute temperature is doubled" is false.

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As we know the direct relationship between Pressure and Temperature by the Gay-Lussac’s Law,

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From this, we get,

                     \frac{P_{1}}{T_{2}}=\frac{P_{2}}{T_{1}}

                     T_{2}=\frac{P_{1} T_{1}}{P_{2}}

So, according to given statement, we have P_{2} = 4 P_{1}

Then from the above expression, we can find out the value of T_{2} when pressure increased by 4 times of initial pressure as,

                     T_{2}=\frac{P_{1} T_{1}}{4 P_{1}}

Hence, we get,

                      T_{1}=4 T_{2}

Hence, from the above expression we can say that as we increase the pressure four times, the temperature does not get doubled. So, the given statement in the question is false.

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4 years ago
Atmospheric pressure decreases with increment in height.<br> give reason​
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Answer:

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Given data:

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* The final height of the book is 2.1 m.

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W=mg(h_f-h_i)

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The work is done in moving the object in upward direction where as the gravitational force is acting in the down ward direction. Thus, the value g (acceleration due to gravity) is taken as negative in this case.

Substituting the known values,

\begin{gathered} W=2\times(-9.8)\times(2.1-0.78) \\ W=-19.6\times1.32 \\ W=-25.9\text{ J} \end{gathered}

Thus, the work done by the gravitational force is -25.9 J.

(B). The work done by the hand on the moving the book is,

\begin{gathered} W_1=-W \\ =25.9\text{ J} \end{gathered}

Thus, the work done by the hand on the book is 25.9 J.

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