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Final Exam Review, part 2 Friday, December 12 6:15 • A 1500kg car drives around a flat 200-mdiameter circular track at 25m/s. What are the magnitude and direction of the net force on the car? What causes this force? 6:24 • The centers of a 10kg lead ball and a 100g lead ball are separated by 10cm. What gravitational force does each exert on the other? 7:10 • What magnitude of F2 causes the net torque on the rod to be zero? F2 F1=20.0N 450 .5m 1m 9:48 • A 20 g ball of clay is thrown horizontally at 30 m/s towards a 1.0 kg block and sticks to the block. The block is on a magic frictionless surface. What is the speed of the block and clay immediately after the clay hits? 7:48 • Before after • V1i =20m/s v2i = 0 vf we want to find • pi=Mball*v1i+0=pf=(Mball + Mblock)vf vf M ball M ball .2 kg .2 1. kg M block 20 m s vi 3.33 m s oscillators • A massless spring has a spring constant of 10.0N/m. It is hung vertically. Then a 250 g mass is hung from the spring. How far does it stretch? • B) If the mass is made to oscillate vertically, what is its period? Mass on a spring • k=10N/m, F =mg =k Δy • Δy = mg/k = .250*9.8/10. = 0.245 m 24.5cm k m f 2 1 k 2 m f 1 .0 0 5 s 1 1 0 .0 N / m 2 .2 5 0 kg Final Exam • Monday, December 15, 1:30-3:30pm HERE