Statement:
The best way to measure the mass of an orange is to use a balance. You put the orange and the mass pieces in the same cup on the balance and find out how many centimeters it is. The mass of my orange was 145.
Explanation:
Problem 1
The student has not done a good job in measuring the weight of the orange. In fact, the has complicated his simple problem.
Reasons:
- Using the mass pieces and the cup to find the weight of the orange is wrong approach.
He can easily place the orange on the balance and read off the weight.
- Centimeters is a unit of length. What length is he measuring and recording?
The unit of weight is in newtons(N).
- Mass is not read from a balance. A balance gives the weight of substance. Mass is different from weight.
Problem 2
Rewriting to paragraph to correct the errors:
The best way to measure the mass of an orange is to use a balance. You put the orange on the balance and find out how many newtons it is. The weight in newtons can be converted to mass in kilogram. The mass of my orange will be 145kg.
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Answer:
Recall from the 1st law of thermodynamic - Energy Balance gives;
assuming : there is no change in kinetic and potential energy, a steady state process, etc.
ΔU = ΔQ + ΔW
For this system, ΔW = +ve (engine does the work)
ΔU = -2952J
ΔQ = -ve? (Heat energy is been released)
Since the heat energy is removed, the internal energy must increase by
-2952J = 642J - ΔQ
ΔQ = (642 + 2952) = 3594 J was released from the engine and the amount that must be cooled off
Now to find the change in the internal energy of the engine?
Note that as as soon as the heat is removed, there would not be any change in the internal energy of the system because all the energy from the burning of the measure of fuel has been removed.
so ΔU = 0J
Answer:
About 24 hours
Explanation:
Think of it as Earths spin
Answer: 21.5kg in grams is 21,500 grams
21.5kg in mg is 215,000,00
Explanation:
