题干

甲同学在20s内用50N的水平推力推动重150N的箱子在水平地面上前进了1m,而乙同学将这一箱子匀速举高1m所用的时间为30s,用W1、P1和W2、P2分别表示甲、乙两同学对箱子做的功和功率,则(   )

A:W1>W2   P1>P2

B:W1>W2   P1<P2

C:W1<W2   P1>P2

D:W1<W2   P1<P2

上一题 下一题 0.0难度 选择题 更新时间:2020-04-14 10:46:10

答案(点此获取答案解析)

D

同类题4

阅读理解

     Rocky Mountain Summer Adventure Camps Bring Learning to Life!

     The Museum of Idaho Rocky Mountain Adventure Camps are available for students aged 6-14. Participants will have amazing outdoor experiences combined with adventure and fun. Space is limited to 20participants each session and registration is not complete until payment has been received by the Museum of Idaho. Registration fee is non-returnable.

     Junior Adventure Camp

     Children aged 6-9 (must have completed first grade).

     Well conduct experiments, go on field trips, and discover the fun and excitement of science! This year, we will learn about colonial(殖民主义的)science to go along with our exhibit, America’s Revolution!

     Instructor: Chloe Doucette

     Dates: June 27- June30

     Time: 9:00 a.m. - noon

     Cost: $75 per child, $60 per child for MOI members, $50 each additional brother or   sister

     Original Camp

     Children aged 9-12 (must have completed third grade)

     Original Camp is for children who are ready for an exciting full-day outdoor camp. Participants visit various habitats and ecosystems as we explore eastern Idaho. Well go bird watching, hiking in the mountains, and lots more!

Instructors: Alana Jensen, Jerry Petty

     Dates: July 18- July21

     Time: 9:00 a.m.  4:00 p.m.(9:00-6:00 on the last day)

     Cost: $150 per child, $125 per child for MOI members, $100 each additional brother or sister

     High Adventure Camp

     Youth aged 11-14 (must have completed fifth grade)

     High Adventure Camp is for youth who are looking for an amazing summer adventure! This outdoor camp is full of exciting physical challenges and involves participants in even more in-depth activities than the Original Camp. This year, students will study how rattlesnakes experience the outdoors!

     Instructors: Chloe Doucette, Mike Winston, Jerry Petty

     Dates: August 8- August 11

     Time: 9:00 a.m.  4:00 p.m.(9:00  6:00 on the last day)

     Cost: $150 per child, $125 per child for MOI members, $100 each additional brother or sister

     Participate in both Original AND High Adventure for only $200! Call522-1400 ext. 3002 to take advantage of this great offer. If you have any questions about the Museum of Idaho’s education programs, contact Chloe Doucette, Education Director at (208) 522-1400 ext.3002.