A first place finisher in a cross country meet ran 5,000 meters in 871.7 seconds. What was his average speed?
1 answer:
Answer : His average speed was, 5.735 m/s
Solution : Given,
Total distance covered = 5000 meter
Total time taken = 871.7 seconds
Average speed : It is defined as the total distance covered in total amount of time.
Formula used :
Now put all the given values in this formula, we get his average speed.
Therefore, his average speed was, 5.735 m/s
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Answer: The heat required is 6.88 kJ.
Explanation:
The conversions involved in this process are :
Now we have to calculate the enthalpy change.
where,
= enthalpy change = ?
m = mass of ethanol = 25.0 g
= specific heat of solid ethanol= 0.97 J/gK
= specific heat of liquid ethanol = 2.31 J/gK
n = number of moles of ethanol =
= enthalpy change for fusion = 5.02 KJ/mole = 5020 J/mole
= change in temperature
The value of change in temperature always same in Kelvin and degree Celsius.
Now put all the given values in the above expression, we get
(1 KJ = 1000 J)
Therefore, the heat required is 6.88 kJ