Question

12. Most fishermen use a bobber to help them keep track of their line and to also see a bite. A fisherman is using a bobber with mass 0.010 kg and volume of 50 cmthat floats on the surface of a lake supporting a submersed fishhook and a bait with a combined mass of 0.01 kg and a combined volume of 2 cm'. The density of water is 0.001 kg/cm'. If a fish grabs the bait, find the minimum downward force, Eat it must exert to pull the bobber completely under the surface of the water. You may assume that the apparent weight of the fish is zero, and the fishing line is completely slack. 13. Find the closest point x where the mass can be placed so that the 5 m uniform beam of weight W does not slip. The coefficient of static friction is 0.45. I 09 B w

Answer 1

12- Total 52CmZ meso = bobbler + bait =ooloky + ooky Total volume = denoity of water = 0.001 kg/cm3 When bobblet bait to empletly pulled molde the water the maximum upthrust force act in it. Upthrust forces cot-of liquid dipplaced Swvg = 0.001*5249.8 0:SEN, The wt of the system=(0.0160.olg= prozkg)g. 30.1961 Now, pulling force required to pull it = 0.51-0-196 lub = 0.314N Ano = extra IF bull mg 13- Free body diagram. Now by force Balance Tm45'+to=W-- E herigental force Balance." T645=R--W RT↑ Tsuas 45 2 R Toptrº mg zhi

How to us R = R= TGAS Now tosque Balance about the point of contact with wall ! ha at TSmag x5 so a ha=5 Tnas TonartMTG45= W put in above can that there to Mes 18 18 mash x=5THASO a=5T n45_5x Sats (resents tt) w a z 5 Ito.45 a=2-22m Aid