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fgiga [73]
3 years ago
5

Steve traveled the first 7 hours of his

Chemistry
1 answer:
const2013 [10]3 years ago
5 0

Answer:

64

Explanation:

Distance traveled in 2 hours = 2 * 40 = 80 m

Distance traveled in 3 hours = 3 * 80 = 240m

Total distance covered = 240 + 80 = 320m

Total time = 2 + 3 =5 h

Hence avg speed = total distance covered / total time taken

= 320/5 = 64mph

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Some water released 7800 J of energy when cooled from 78°C to 33°C. What was the mass of the water?
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Answer:

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Explanation:

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m = Mass

q = Energy (or joules)

Cp = Heat Capacity

T = Change in Temperature

Water's heat capacity is always 4.18.

This is the formula you'll need for change in temperature:

Final - Initial

So, 33 - 78 = -45

m = 7800 / 4.18 x -45

= -41.47

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