7. Friction, Inclines, Systems
Inclined Planes
7. Friction, Inclines, Systems
Inclined Planes
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- Multiple Choice
A 4.0-kg box sits on a frictionless inclined plane that makes a 21° angle with the horizontal. It is held in place by a cord parallel to the plane. Calculate the tension in the cord.
- Multiple ChoiceA car is parked on a hill with a 5° slope. What is the magnitude of the friction force acting on the car?
- Open QuestionAn 8.00-kg block of ice, released from rest at the top of a 1.50-m-long frictionless ramp, slides downhill, reaching a speed of 2.50 m/s at the bottom. (a) What is the angle between the ramp and the horizontal?
- Open QuestionA 4000 kg truck is parked on a 15 degrees slope. How big is the friction force on the truck? The coefficient of static friction between the tires and the road is 0.90.
- Open QuestionA rifle with a barrel length of 60 cm fires a 10 g bullet with a horizontal speed of 400 m/s. The bullet strikes a block of wood and penetrates to a depth of 12 cm.b. How long does it take the bullet to come to rest?
- Open Question
(II) A block is given an initial speed of 5.2m/s up the 22.0° plane shown in Fig. 4–45. <IMAGE>
(b) How much time elapses before it returns to its starting point? Ignore friction.