Answer:
(a) 94.25 m/min
(b) 
(c) 1 min
(d) 10.996 kW and 15.027 kW
(e) 7 kN and 9.57 kN
Explanation:
The maximum cutting speed,
is observed at the outer diameter hence
where N is the rate of rotation and
is the outer diameter. Substituting 75mm for
and 400 rpm for N we obtain

(b)
The material removal rate, MRR is given by
where
is the average between the inner and outer diameters, d is the depth of cut, f is the feed which is given by
where V is the axial velocity
In this case, the average diameter is 
The feed f is
The depth of cut is 
Therefore, 
(c)
Time of cut is given by
where L is the length of rod. Substituting L for 200mm, f as seen in part b is 0.5 and 400 for N we obtain

(d)
The power is obtain by multiplying specific energy by material removal rate. Assuming specific energy range of
to
then
Power, 
Power, 
Therefore, power ranges between 10.996 kW and 15.027 kW
(e)
Cutting force is given by
where P is power and
is already calculated in part a
First,
is converted to m/s hence 
From the power range in part d,


Therefore, the cutting force ranges from 9.57 kN and 7 kN