If a glass of water is on a table with a piece of paper under it, it is relatively easy to pull the paper out without disturbing the glass very much if the pull is done very quickly. This is because, with a quick pull:
A: the force on the glass will be less.
B: the momentum of the paper will be greater.
C: the time for the pull will be less.
D: the coefficient of kinetic friction will be less.
E: None of the others.
A: the force on the glass will be less.
B: the momentum of the paper will be greater.
C: the time for the pull will be less.
D: the coefficient of kinetic friction will be less.
E: None of the others.
举一反三
- He was very iii for a time, but he managed to ______. A: pull on B: pull in C: pull up D: pull through
- The boy was very sick, but he managed to [u] [/u]. A: pull off B: pull out C: pull through D: pull up
- They were interested in our views at first but ____________ time went on we were consulted less and less.
- Margaret had difficulty with her mathematics, but her teacher managed to _______ her _______. A: pull out B: pull down C: pull up D: pull through
- What does the employee think about the job A: It is done by people of lower rank. B: It is paid less. C: It demands less ability.