GWCB001 Question 2
Problem Statement
ジュールの知識
Problem
Student A decided to research the definition of the “joule (J).” Solve the following problem.
The joule (J) is the International System of Units (SI) unit representing A, B, C, and D. It is defined as the work (or the energy required) done when an object is moved a distance of 1G in the direction of a force of 1F.
(1) Select the combination of numbers from the options below that correctly identifies A, B, C, and D.
1: A = energy, B = work, C = heat, D = electric power
2: A = energy, B = work, C = heat, D = electric power
3: A = energy, B = work, C = voltage, D = electric power
4: A = energy, B = force, C = heat, D = electrical power
5: A = energy, B = work, C = temperature, D = electrical power
6: A = energy, B = heat, C = electrical power, D = power
(2) Select the unit that corresponds to F from the options below by number.
0: W 1: J 2: N 3: kg 4: m 5: Pa 6: V 7: A 8: kcal 9: Hz
(3) Select the unit that corresponds to G from the list below by its number.
0: cm 1: m 2: s 3: kg 4: N 5: J 6: km 7: W 8: m2 9: h
Constraints
Select by number.
Input Format
Let A1 be the answer to Part 1, A2 be the answer to Part 2, and A3 be the answer to Part 3. Submit 100A1+10A2+A3 as your answer.
Solution
Answer: 221
This question tests whether you correctly understand the properties and definition of the “joule (J),” a unit in the International System of Units (SI) that forms the basis of physics and electricity.
I created this question because I thought it was important to know—since it’s a concept used quite often in physics—and also because I didn’t have any other ideas.
(1) A–D: Four Physical Quantities Represented by the Joule
The joule (J) is a highly versatile unit in physics and is commonly used to represent all four of the following physical quantities.
- Energy: The ability to do work.
- Work: The amount of energy transferred when a force is applied to an object to move it.
- Heat: The amount of energy transferred as heat.
- Electric energy: The total amount of electrical energy consumed by an electrical appliance over a certain period of time (in seconds).
Therefore, the correct combination is “2.”
(2) F: Unit of force
The formula for work (J) is “Work = Force × Distance”.
The “1 F” in the definition is replaced by the unit of force in the SI system.
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The unit of force in the SI system is the newton (N).
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Option “2” corresponds to N.
Therefore, the correct answer is “2.”
(3) G: Unit of distance
In the definition of work, the G in “when moved 1G in the direction of the force” is replaced by the unit of length (distance) in the SI base system.
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In physics formulas and calculations using the SI system, the standard unit of distance is the meter (m), not cm or km.
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Option “1” corresponds to m.
Therefore, the correct answer is “1.”
Summary
The numbers selected for each subquestion are as follows:
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Answer for Subquestion (1) (A1): 2
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Answer for Subquestion (2) (A2): 2
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Answer for Subquestion (3) (A3): 1
Perform the calculation according to the answer format.
100A1+10A2+A3=100(2)+10(2)+1=221