14. Compute the minimum distance that a truck slides on a horizontal asphalt road if it is traveling at 20 m/s. The coefficient of sliding friction between asphat and rubber tire is 0.50. The mass of the truck is 8000 kg. a. 40.8 m b. 48.5 m c. 35.3 m d. 31.4 m a b C d
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- The coefficient of friction between a race car's wheels and the track is 1.0. The car starts from rest and accelerates at a constant rate for 275 m. Find the maximum speed at the end of the race.a. 52 m/s b. 57 m/s c. 73 m/s d. 86 m/sThe weight of the rock is 76N. An upward force of 106N is exerted on the rock. What is the net force acting on the rock? A. 76 N downward B. 30 N upward C. 182 N downward D. 106 N upward24. A pickup truck with mass 980 kg is initially at rest. The truck accelerates to a speed of 95 km/hr within a distance of 60 meters. What the direction and size of the force that acts on the truck? a. b. If the truck were carrying a load of 200 kg, what new force would be required to achieve the same acceleration?
- 13. An object sits at rest on a ramp. As the angle of inclination of the ramp increases, the object suddenly begins to slide. Which of the following explanations best accounts for the object's movement? a. The coefficient of static friction has decreased sufficiently. b. The force of gravity acting on the object has increased sufficiently. c. The component of gravity along the ramp has increased sufficiently. d. The friction has decreased sufficiently while the normal force has remained unchanged. e. The normal force has increased sufficiently.A box is being pulled to the right over a rough surface. T> fk, so the box is speeding up. Suddenly the rope breaks. What happens? The box Select one: a. Slows steadily until it stops b. Continues with the speed it had when the rope broke С. Continues speeding up for a short while, then slows and stops. O d. Keeps its speed for a short while, then slows and stops. e. Stops immediatelyA 10-kg wooden box rests on a ramp that is lying flat. The coefficient of static friction is 0.50, and the coefficient of kinetic friction is 0.30. What is the friction force between the box and ramp if a 30 N horizontal force is applied to the box? A.50 N B.20 N C.0 N D.30 N
- 13. You want to push a 7-kg box up a 15° ramp. The coefficient of kinetic friction between the ramp and the box is 0.30. With what magnitude force parallel to the ramp should you push on the box so that it moves up the ramp at a constant speed? 7kg e=15° А. 16.56 N B. 55.56 N C. 37.67 N D. 23.50 N3. Am=12.0 kg object is placed on a bathroom scale in an elevator. a. Draw a free body diagram of the object. Label the forces. Determine the apparent weight (the weight that would show in the scale) of the object if. b. The elevator is at rest. c. The elevator is rising at a constant velocity. d. The elevator is accelerating upward at 1.5 m/s/s. m e. The elevator is accelerating downward at 1.5 m/s/s. f. The elevator is accelerating downward at 10 m/s/s.8. An object is pulled across a rough horizontal surface with an applied force of 300 N [40o below the horizontal]. The applied force is slowly rotated down toward the horizontal, decreasing the 40o angle. What will happen to the force of friction acting on the object and the acceleration? a. Both increase.b. Both decrease.c. Friction decreases and acceleration increases.d. Friction increases and acceleration decreases.e. None of the above statements are accurate.