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# Practice%20Test%202 - Practice Test 2 1. A highway curve...

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Unformatted text preview: Practice Test 2 1. A highway curve has a radius of 0.14 km and is unbanked. A car weighing 12 kN goes around the curve at a speed of 24 m/s without slipping. What is the magnitude of the horizontal force of the road on the car? a. 12 kN b. 17 kN c. 13 kN d. 5.0 kN e. 49 kN d 2. A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot? a. 3.6 kN up b. 4.3 kN up c. 2.9 kN down d. 2.9 kN up e. 5.8 kN down b 3. A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the lowest point on the circle, the speed of the mass is 12 m/s. What is the magnitude of the force of the string on the mass at this position? a. 31 N b. 36 N c. 41 N d. 46 N e. 23 N c 4. A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position? a. 7.0 N b. 2.0 N c. 3.1 N d. 5.1 N e. 6.6 N c 5. A 0.30-kg mass attached to the end of a string swings in a vertical circle ( R = 1.6 m), as shown. At an instant when θ = 50 ° , the tension in the string is 8.0 N. What is the magnitude of the resultant force on the mass at this instant? m v t θ g R a. 5.6 N b. 6.0 N c. 6.5 N d. 5.1 N e. 2.2 N c 6. A 0.40-kg mass attached to the end of a string swings in a vertical circle having a radius of 1.8 m. At an instant when the string makes an angle of 40 degrees below the horizontal, the speed of the mass is 5.0 m/s. What is the magnitude of the tension in the string at this instant? a. 9.5 N b. 3.0 N c. 8.1 N d. 5.6 N e. 4.7 N c 7. A race car traveling at 100 m/s enters an unbanked turn of 400 m radius. The coefficient of (static) friction between the tires and the track is 1.1. The track has both an inner and an outer wall. Which statement is correct? a. The race car will crash into the outer wall. b. The race car will crash into the inner wall. c. The car will stay in the center of the track. d. The car will stay in the center of the track if the driver speeds up. e. The car would stay in the center of the track if the radius were reduced to 200 m. a 8. For a plane to be able to fly clockwise in a horizontal circle as seen from above, in addition to exerting a force downwards on the air a. it must be increasing its speed....
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## This note was uploaded on 05/24/2011 for the course ENGINEERIN 1 taught by Professor Lee during the Spring '11 term at Sungkyunkwan.

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Practice%20Test%202 - Practice Test 2 1. A highway curve...

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