26:15A 1500kg car drives around a flat 200-m-diameter circular track at 25m/s. What are the magnitude and direction of the net force on the car? What causes this force?
36:24The centers of a 10kg lead ball and a 100g lead ball are separated by 10cm. What gravitational force does each exert on the other?
47:10 What magnitude of F2 causes the net torque on the rod to be zero? F1=20.0N450.5m1m
59:48A 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?
67:48 Before after V1i =20m/s v2i = 0 vf we want to find pi=Mball*v1i+0=pf=(Mball + Mblock)vf
7oscillatorsA 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?
8Mass on a spring k=10N/m, F =mg =k Δy Δy = mg/k = .250*9.8/10. = m 24.5cm