1) A car coasts (engine off) up a 30Âº grade. If the speed of the car is 25 m/s at the bottom of the grade, What is the difference traveled by the car before it comes to rest? Draw a free-body diagram showing all forces 2) In an emergency stop to avoid an accident, a shoulder strap seat belt holds a 60 kg passenger in place. If the car was initially traveling at 90 km/hour and came to a stop in 2.5 seconds along a straight, level road, what was the average force applied to the passenger by the seatbelt? Draw a free-body diagram showing all forces 3) Suppose a block with a mass of 2.5 kg is resting on a ramp. If the coefficient of static friction between the block and ramp is 0.350, what maximum angle can the ramp make with the horizontal before the block starts to slip down. Draw a free-body diagram showing all forces 4) Someone at the other end of the table asks you to pass the salt. Feeling quite dashing, you slide the 50.0 g shaker in their direction giving it an initial speed of 1.15 m/s. If the shaker comes at a rest in 0.840 m, what is the coefficient of kinetic friction between the shaker and the table? Draw a free-body diagram showing all forces 5) Carol pushes a 50 kg wood box across a wood floor at a steady speed of 2.0 m/s. How much force does Carol exert on the box? If she stops pushing, how far will the box slide before coming to rest. ( The coefficient of kinetic friction is 0.20.) Draw a free-body diagram showing all forces 6) What is the weight of a 150lb person in Newtons? What is his mass in kg? Draw a free-body diagram showing all forces 7) A block of mass 0.50 kg travels with a speed of 2.0 m/s in the x direction on a flat frictionless surface on passing through the origin, the block experiences a constant force of 3.0 N at an angle of 60Âº relative to the x-axis for 1.5 seconds. What is the velocity of the block at the end of the time? Draw a free-body diagram showing all forces 8) A 65 - kg ice skater coasts with no effort for 75 meters until she stops. If the coefficient of kinetic friction between her skates and the ice is uk=0.10, how fast was she moving at the start of her coasts. Draw a free-body diagram showing all forces 9) A 40 kg crate is at rest on a level surface. If the coefficient of static friction between the crate and the surface is 0.69, what horizontal force is required to get the crate moving? Draw a free-body diagram showing all forces 10) While being unloaded from a truck a 10-kg suitcase is placed on a flat ramp inclined at 37Âº. When released from rest, the suitcase accelerates down the ramp at 0.15 m/s^2. What is the coefficient of kinetic friction between suitcase and ramp? Draw a free-body diagram showing all forces

Subject | Science |

Due By (Pacific Time) | 10/22/2015 09:00 am |

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