# for bc
scale=10
# friction coefficient
miu=0.4
# the horizontal weight that needs to be pushed (in kg)
load=20
# pion radius (in cm)
r=2.54/2
# the distance (in meters) on which the weight (screen) needs to be pushed.
x=0.381
# travel time (in seconds) for the weight
t=10
# acceleration
atrap=4.5*x/(t^2)
print "atrap = ", atrap, " m/s^2\n"
# speed
v=1.5*x/t
print "v = ", v, " m/s\n"
m=load
# force
fa=m*atrap
print "F_a = ", fa, " N\n"
# friction force
ff=miu*m*atrap
print "F_f = ", ff, " N\n"
# total force, including friction
fp=fa+ff
print "F_peak = ", fp, " N\n"
torque=fp*r
print "T = ", torque, " kg/cm\n"