Please help!

47.

47. || A 50cmdiameter, 400 g beach ball is dropped with a 4.0 mg ant riding on the top. The ball experiences air resistance, but the ant does not. What is the magnitude of the normal force exerted on the ant when the hall's speed is 2.0 mfs? 49. || Find an expression for the magnitude of the horizontal force F in FIGURE P149 for which m1 does not slip either up or down along the wedge. All surfaces are frictionless. FIGURE P149 m 3.0 kg Frictionless Frictionless 12 1.0 kg FIGURE CP7.54 FIGURE CP7.55 55. Ill What is the acceleration of the 3.0 kg block in FIGURE CP7.55 across the frictionless table? Hint: Think carefully about the acceleration constraint.57. III FIGURE CP7.57 shows a 200 g hamster sitting on an 800 g wedge-shaped block. The block, in turn, rests on a spring scale. An extra-fine lubricating oil having /s = M =0 is sprayed on the top surface of the block, causing the hamster to slide down. Friction between the block and the scale is large enough that the block does not slip on the scale. What does the scale read, in grams, as the hamster slides down? 40 FIGURE CP7.57 Scale58. III FIGURE case shows three hanging masses connected by massless strings over two massless, frictionless pulleys. a. Find the acceleration con- straint for this system. It is a single equation relating a1)\" (12),, and 03).. Hint: YA isn't constant. b. Find an expression for the tension in string A. Hint: You should be able to write four second-law equations. These, plus the acceleration constraint, FIGURE CP7.58 are ve equations in ve unknowns. c. Suppose: m1 = 2.5 kg, m2 = 1.5 kg, and m3 = 4.0 kg. Find the acceleration of each. d. The 4.0 kg mass would appear to be in equilibrium. Explain why it accelerates