Prctice Midter Multiple Choice 1. A. C 3. D 4. D 5. D 6. E 7. D 8. A 9. C 9. In word, 3.5*10 11 i E. 350 billion (I nubered 9 twice by itke!) 10. D 11. B 1. D 13. E 14. A 15. C 16. B 17. A 18. A 19. E 0. D Proble (Show your work!) 1. I 1 kiloeter cloet to 500 eter, 500 feet, or.5 ile? Firt, how how ny eter, feet, nd ile re equivlent to 1 kiloeter. 500 = () (500) = =. 5k
500 ft.54c 1inche = 100c 1inch 1foot.54c 1inche = 500 ft 100c 1inch 1foot =. 154k.5 ile.154k 580 feet =, fro bove 500 feet ile.154k 580 feet =. 5ile 500 feet ile =. 805k Since.805 k i the cloet to 1 k,.5 ile i the cloet pproxition to 1 k.. It i 6 k to your UR prking pce, nd you bicycle there in 0 inute. (Aue for entire proble tht you trvel in tright line). Wht i your verge peed (in /)? Firt, find the in econd (nd the ditnce in eter). 0 in = 10 nd 6 k = 6000 in di tn ce peed = 6000 = 5 10 If you trt off fro ret nd incree to peed of 4 / in the firt inute of your journey, wht i your verge ccelertion during thoe 60 econd (in /(^))? velocity ccelerti on = 4 ccelerti on = = =. 067 15
How fr will you hve trveled in tht inute ()? di tn ce = di tn ce = 1 1 t ( 15 )() di tn ce = 3600 = 10 30 If it tke you 19 inute to trvel the reining ditnce, wht i your verge peed for the ret of the trip (in /)? The reining i 19 inute 19 in = 1140 in The reining ditnce i 6000 10 = 5880 And peed i found by the eqution: di tn ce peed = 5880 peed = = 5. 16 1140 3. You puh your kg phyic book long tbletop, puhing it with 10 newton of force. () If the book i greed o tht friction i negligible, wht i the book ccelertion? F = F = 10newton = kg 5 = (b) Suppoe the book i not greed, nd tht the frictionl force on it i 4 newton. Wht i the book ccelertion?
In thi ce, the force of friction i working gint the puh on the book. F = 10 newton 4newton = 6newton Then, we ue Newton econd lw to y: F = 6newton = kg 3 = (c) Suppoe the book i not greed, nd tht the frictionl force on the book i 10 newton. Wht hppen to the book? The frictionl force i greter thn the force of the puh, o you would expect the book to ove bckwrd. (But when you puh on book le thn i needed to ove it, it doe not ove bckwrd, it ty in it originl plce). Short Anwer Quetion 1. When we y the un rie, wht do we relly en? When we y the un rie, we en tht the Erth rottion cue the un to pper to ove fro et to wet cro the ky.. Wht i the cheicl forul for crbon dioxide (one crbon to nd two oxygen to)? Crbon onoxide (one crbon nd one oxygen to)? Methne (crbon nd four hydrogen to)? Crbon tetrchloride ( tetr en four )? The cheicl forul re: crbon dioxide - CO crbon onoxide - CO ethne - CH 4 crbon tetrchloride - CCl4 3. Two bicycler p one nother on the e rod, trveling in oppoite direction. Could they poibly hve the e peed? The e velocity? Explin. The bicycler y poibly hve the e peed (for exple, if both re trveling t 0k/h. They cnnot poibly hve the e velocity, becue velocity depend on direction nd they re not trveling in the e direction.
4. () Would it be eier to lift your phyic book on Erth or on the oon? It would be eier on the oon, becue the force due to grvity on the oon i le thn the force due to grvity on the Erth (force due to grvity on the oon i bout 1/6 tht of the Erth). (b) Neglecting friction, would it be eier to et the book into horizontl otion on Erth or on the oon? It would be the e to et it into horizontl otion on Erth or on the oon, becue if friction i neglected, there re no horizontl force cting on the book. (c) Neglecting friction, would it be eier to et the book into horizontl otion on Erth or in ditnt pce? It would be the e to et it into horizontl otion on Erth or in ditnt pce, becue if friction i neglected, there re no horizontl force cting on the book.