31. An airplane with a mass of 800 kg is flying in a circle of radius 500 m at 50 m/s. What is the centripetal force required to keep the airplane flying in the circle? a. 50 N b. 80 N C. 4000 N d. 8000 N32. 33. 34. 35. A child has a mass of 40.0 N and is swinging on a swing. At the bottom of the arc the child feels an apparent weight twice her normal weight. What is the centripetal acceleration of the child at this point? a. 0 m/s2 13- g c. 2g (1. 33 An aerobatic airplane is stressed for a maximum of 10g acceleration. During a loop, the pilot pulls the airplane around the bottom of the loop with a radius of 0.100 km. What is the maximum speed permitted at the bottom of the loop? a. 31.3 m/s b. 70.0 m/s c. 93.9 m/s d. 99.0 m/s A road is banked such that cars can go around the curve even if it is icy and friction is essentially zero. What forces belong on a FBD for a car under these conditions? a. gravity, normal b. gravity only c. normal only d. gravity, normal, centripetal The top of a hill on a roller coaster has a circular shape with a radius of 25.0 m. A car going over the top makes the passengers feel weightless at the very top. How fast is the car going? a. 3.13 m/s b. 9.80 m/s c. 15.7 m/s d. 245 m/s 36. 37. Two cars, with masses of 1200 kg and 2400 kg respectively, are going around the same curve with the same speed. Which statement is true? a. Both cars experience the same centripetal force. b. Both cars experience the same centripetal acceleration. c. The heavier car experiences twice the centripetal acceleration of the lighter car. (1. The heavier car experiences half of the centripetal force of the lighter car. Which statement is true about the Coriolis force? It acts only on objects that are at rest with respect to Earth's surface. It is a real force that pushes winds into systems that rotate. It causes low-pressure systems to rotate counterclockwise in the northern hemisphere. It was named after a German physicist. 9.057?\" 38. A vacationer stands on a scale at Earth's equator. A FBD for the vacationer is shown. Which statement is true? AFN mg a. The force of gravity is greater than the normal force. b. The normal force is greater than the force of gravity. c. The force of gravity is equal to the normal force. d. The normal force should not be on the FBD. 39. Astronauts that spend long periods of time in free-fall suffer from health effects including a. muscles becoming larger. b. bones losing calcium. c. heart and blood vessels becoming smaller and constricted. d. kidneys processing less urine. 40. An alien spaceship in a science-fiction movie has the shape of a sphere with a radius of 240.0 m. The ship rotates with a period of 20.0 s to simulate normal gravity at the equator of the ship. What is normal gravity for the aliens? a. 9.80 m/s2 b. 11.8 m/s2 c. 23.7 m/s2 d. 473 m/s2