A car rounds a 75 m radius curve at a constant speed of 18 m/s. A ball is suspended by a string from the ceiling the car and moves with the car. The angle between the string and the vertical is: Select one: O a. 0° O b. 90° O . 1.4° Od. cannot be found without knowing the mass of the ball O e. 24°

ans. a) 18.8 m/s c) 10.8 m/s c) How fast can the car take a 40-m radius turn when the pavement is icy? b) How fast can the car take a 40-m radius turn when the pavement is wet? a) How fast can a 2000-kg car take a 40-m radius turn when the pavement is dry? is dry, us = .6 when the pavement is wet, and µs = .3 when the pavement is icy. The mass of the car is 5. The coefficient of static friction for a certain kind of pavement and tires is u, = .9 when the pavement

A  2.1 kg ball on a 3.7 m string is spun in a horizontal circle. The ball's tangential velocity is 1.9 m/s. What is the tension on the string? A. 1.1 N B. 2.1 N C. 4.1 N  D. 3.3 N

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A 4.0 kg car is traveling around a vertical loop with a radius of 2 m. What is the normal force from the surface of the track when the car is at its highest point if it is moving with a speed of 5 m/s? A.40 N B.90 N C.50 N D.10 N

Two cars are traveling around a vertical loop of radius 5 m. A.) Determine the minimum speed the green car must be going to not fall. Vgreen, min = B.) Determine the normal force on the 1150 kg red car if its going 10.5 m/s. FN =

of ion Determine the coefficient of friction when an 2050 kg truck takes a circular path (with a radius of 40.1 m) at 13.5 m/s. a. Not shown here. b. 0.0344 Ⓒc. 0.464 d. 0.626 e. 0.232 Ⓒf. 0.0687 g.0.742 Ⓒh. 0.704

mm.2 Humpback whales sometimes catch fish by swimming rapidly in a circle, blowing a curtain of bubbles that confuses a school of fish and traps it in a small area, where the whales can easily catch and eat them. Suppose a 25,000- kg humpback whale swims at 2.3 m/s in a circle of radius 8.6 m . What centripetal force must the whale generate?