Posted: November 6th, 2015

Physics

Physics

1) A car coasts (engine off) up a 30º 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?

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 OF the average force applied if the passenger by the seatbelt?

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.

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?

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.)

6) What is the weight of a 150lb person in Newtons? What is his mass in kg?

7) A block of mass 0.50 kg travels with a speed of 2.0 m/s in the x direction on a slat frictionless surface on passing through the origin, the block experiences a constant force of 3.0 N at an angle of 60º relative to the x-axis for 1.5 seconds. What is the velocity of the block at the end of the time?

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.

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?

10) While being unloaded from a truck a 10-kg suitcase is placed on a flat ramp inclined at 37º. 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 diagram ec #

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