How much heat is required to completely boil away 0.200 kg of water (ΔHv = 2.26 × 103 kJ/kg)?
2 answers:
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Answer:
a) x_average = ∑ / n
, b) Δx_{i} = x_{i} –x_average,
d) σ = √(1/n-1 ∑ Dx_{i}² )
Explanation:
Some definitions are requested
a) the average value is the sum of all the values divided by the number of them, if the uncertainties are random, this is the closest value to the real one
x_average = ∑ / n
b) The deviation from the mean value or absolute error is the measured value minus the average value
Δx_{i} = x_{i} –x_average
c) is the average value of the deviations
Δx_average = ∑ Δx_{i} / n
d) It is a measure of the dispersion of the values with respect to their average value, it takes the worst of all cases, widely used for large numbers of data
σ = √(1/n-1 ∑ Dx_{i}² )
Experimental results should be given as follows
Average value ± uncertainty and the standard deviation
(x_average + - Δx_average)
σ
Answer:
a
b
Explanation:
From the question we are told that
The child's weight is
The length of the sliding surface of the playground is
The coefficient of friction is
The angle is
The initial speed is
Generally the normal force acting on the child is mathematically represented as
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Note
Generally the frictional force between the slide and the child is
Generally the resultant force acting on the child due to her weight and the frictional force is mathematically represented as
Here F is the resultant force and it is represented as
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So
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Generally the heat energy generated by the frictional force which equivalent tot the workdone by the frictional force is mathematically represented as
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Generally from kinematic equation we have that
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