Aerodynamic Ceiling
Uncategorized June 26th. 2011, 12:49pmAerodynamic Ceiling
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Physicss AHH please help?
so im trying to do my homework, but its like impossible, any help would be greatly appreciated.
1. an object of mass 7.2 is suspended on string from the ceiling of a moving elevator. Given 9.8 m/s2 for gravity and the string tension 30.456 N, find the elevators acceleration, taking upward acceleration to be possitive and downward to be negative
2. a 1800 kg car moves along a horizontal road at speed v0=13.9 m/s2, the road is wet, so the static friction coefficient is .126, and the kinetic friction is .0882. gravity is 9.8, assume no aerodynamic forces and forward is possitve direction, what is the highest possible deceleration of the car under such conditions in m/s2
3. a 29kg chair initially at rest on a horizontal floor requires 364 N horizontal force to set it in motion, once in motion 338 N horizontal keeps it moving constantly, acceralation of gravity is 9.81, what is the coefficient of static fricion between the chair and the floor, and help is greatly appreciated 
))
I'll show you the method. you can plug in the numbers
1) sum of the forces in the veritcal direction = m*a = T - m*g
a = (T - m*g)/m = T/m - g
2) sum of the forces in the horizontal direction = m*a =
m*a = friction
a = friction/m
firction is defined as
friction = N * u
N = m*g
plug those back into a
a = m*g*u/m = g*u
use static friction, because kinetic friction means the cars brakes are locked up and the car is sliding.
3) sum of the forces horizontally = 0
0 = 364 - friction
friction = 364
again
friction = N*u = m*g*u
plug it back into a
m*g*u = 364
u = 364/(m*g)
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Car Aerodynamics
