surma884
Oct15-04, 09:39 AM
Ooops, sorry I posted in the wrong forum.
Here are the problems. I have no idea where to start! I don't want the answer I just want a little clue to get me started.
Scenario: Two packages at UPS start sliding down a 20 degree ramp, and package A is in front of package B. Package A has a mass of 4.50 kg and a coefficient of kinetic friction of 0.200. Package B has a mass of 10.5 kg and a coefficient of kinetic friction of 0.140.
Question: How long does it take package A to reach the bottom?
Scenario: Two blocks are hanging off a pulley by a string. One block on the left and the other on the right. A 100 kg block takes 5.90s to reach the floor after being released from rest.
Question: What is the mass of the other block?
Question: A house painter uses a chair and pulley arrangement to lift himself up the side of a house. The painter's mass is 70 kg and the chair's mass is 10 kg. With what force must he pull down on the rope in order to accelerate upward at 0.20m/s^2
If someone could just explain to me the steps I should take to go about solving these problems. BTW, I am clueless about the formulas. I only know Force = mass*accelaration.
Here are the problems. I have no idea where to start! I don't want the answer I just want a little clue to get me started.
Scenario: Two packages at UPS start sliding down a 20 degree ramp, and package A is in front of package B. Package A has a mass of 4.50 kg and a coefficient of kinetic friction of 0.200. Package B has a mass of 10.5 kg and a coefficient of kinetic friction of 0.140.
Question: How long does it take package A to reach the bottom?
Scenario: Two blocks are hanging off a pulley by a string. One block on the left and the other on the right. A 100 kg block takes 5.90s to reach the floor after being released from rest.
Question: What is the mass of the other block?
Question: A house painter uses a chair and pulley arrangement to lift himself up the side of a house. The painter's mass is 70 kg and the chair's mass is 10 kg. With what force must he pull down on the rope in order to accelerate upward at 0.20m/s^2
If someone could just explain to me the steps I should take to go about solving these problems. BTW, I am clueless about the formulas. I only know Force = mass*accelaration.