# 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"