<h3>With a uniform acceleration of 2 m/s ²</h3>
Answer:
(D) 4
Explanation:
The percentage error in each of the contributors to the calculation is 1%. The maximum error in the calculation is approximately the sum of the errors of each contributor, multiplied by the number of times it is a factor in the calculation.
density = mass/volume
density = mass/(π(radius^2)(length))
So, mass and length are each a factor once, and radius is a factor twice. Then the total percentage error is approximately 1% +1% +2×1% = 4%.
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If you look at the maximum and minimum density, you find they are ...
{0.0611718, 0.0662668} g/(mm²·cm)
The ratio of the maximum value to the mean of these values is about 1.03998. So, the maximum is 3.998% higher than the "nominal" density.
The error is about 4%.
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<em>Additional comment</em>
If you work through the details of the math, you will see that the above-described sum of error percentages is <em>just an approximation</em>. If you need a more exact error estimate, it is best to work with the ranges of the numbers involved, and/or their distributions.
Using numbers with uniformly distributed errors will give different results than with normally distributed errors. When such distributions are involved, you need to carefully define what you mean by a maximum error. (By definition, normal distributions extend to infinity in both directions.) While the central limit theorem tends to apply, the actual shape of the error distribution may not be precisely normal.
Answer:
16.82 kJ/g
Explanation:
The Heat energy generated by the pentance combusion caused the temperature increasing of the caloriemeter and the water inside it.
Heat energy of a substace can be calculated using
Q = mcθ
C= mc
where Q = Heat energy
m =mass
c = specific heat capacity
C = heat capacity
θ =temperature difference
(Temperature difference = final temperature - initial temperature.)
heat absorbed by water = mcθ
= 1 * 4.184 * (22.82-20.22)
= 10.88 J --------------(1)
heat absorbed by calorimeter = Cθ
= 2210 *(22.82-20.22)
= 5746 J ---------------(2)
Combustion energy = heat absorbed by water + heat absorbed by calorimeter
Combustion energy = 10.88+ 5746 = 5756.88 J
= 5.757 kJ
heat of combustion of pentane = Combustion energy / mass
= 5.757 / 0.3423
= 16.82 kJ/g
The electric force is small in comparison because charges are VERY small but the
gravitational force has to do with the mass of the Earth and Moon.
