We can easily see from the definition of k _______ the ratio of a force _______ a length that the unit of elastic potential energy (弹性势能) is the same as the unit of work (功) .
举一反三
- Which unit below is not in the System International (SI) of units? A: Unit of length is the meter (m) , B: The force unit is the pound (lb), C: The time unit is the second (s), D: The temperature unit is the kelvin (K).
- 99. In Unit 1, from the jobs which Jack had applied for, we can see that he would like to work in the field of ____. A: politics B: entertainment C: fashion D: business
- 中国大学MOOC: What can we learn about Chinese square dancing from this unit?
- From this unit, we learn that good table manners include ________.
- If the size of the work force can be easily and rapidly altered market fluctuations, profits will be maximized.