physics need help!?
2. A 55kg snow-skier comes down a hill at an angle of 40 degree to the horizontal. The coefficient of friction is 0.06. What is the skier’s accelertion.
3. A 500kg trailer being pulled behind a car is subject of a 100N resistance force due to friction. What force must the car exert on the trailer if: a) the trailer is to move at a constant speed of 25km/hr. b) the trailer is to move forward w/ an acceleration of 2.0m/s^2. c) starting from rest, the trailer and the car are to travel 150m in 10s?
Im not really good in physics and i kind of need help on this, so please if u know how to do this please help me, i will be so happy if u do.
Favorite Answer
2. F = ma
mgcos(40) – .06mgsin(40) = ma
gcos(40) – .06gsin(40) = a
= 7.13 m/s^2
3. a. constant speed means that net force is zero
The car must pull with a 100 N force.
b. F – 100 N = ma
F = (500 kg)(2.0 m/s^2) + 100 N
= 1100 N
c. vo = 0 m/s
x = 150 m
t = 10 s
x = .5at^2
150 m = .5a(10 s)^2
a = 3 m/s^2
F – 100 N = ma
F = (500 kg)(3.0 m/s^2) + 100 N = 1600 N
