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3 years ago

15

Sonny Toomey 16 seconds to finish a 100-m race. What was Sonny's average speed in the race? Give your answer in the decimal form

.

1 answer:

Anna [14]3 years ago

6 0

Answer:

6.25 m/s.

Explanation:

Total distance travelled = 100 m

Total time = 16 s

Average speed =?

Average speed is simply defined as the ratio of total distance travelled to the total time taken to cover the distance. Mathematically, it is expressed as:

Average speed = total distance / total time

With the above formula, we can obtain the average speed of Sonny Toomey as illustrated below:

Total distance travelled = 100 m

Total time = 16 s

Average speed =?

Average speed = total distance / total time

Average speed = 100 / 16

Average speed = 6.25 m/s

Therefore, the average speed of Sonny Toomey is 6.25 m/s

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A 23.5 g piece of aluminum metal is initially at 100.0°C. It is dropped into a coffee cup-calorimeter containing 130.0 g of wate

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Answer: The molar heat capacity of aluminum is $25.3J/mol^0C$

Explanation:

$heat_{absorbed}=heat_{released}$

As we know that,

$Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})$

$m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]$ .................(1)

where,

q = heat absorbed or released

$m_1$ = mass of water = 130.0 g

$m_2$ = mass of aluminiunm = 23.5 g

$T_{final}$ = final temperature = $26.0^oC=(273+26)K=299K$

$T_1$ = temperature of water = $23^oC=(273+23)K=296K$

$T_2$ = temperature of aluminium = $100^oC=273+100=373K$

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Now put all the given values in equation (1), we get

$130.0\times 4.184\times (299-296)=-[23.5\times c_2\times (299-373)]$

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3 years ago

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Answer:

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The only choice which is higher than 400 Hz is 434 Hz, so this is the frequency that Rita will hear.

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