both parts pls

While exercising in a fitness center, a man Ees face down on a bench and lifts a weight with one lower leg by contacting the muscles in the back of the upper leg. Part (a) Find the magnitude of the angular acceleration produced given the mass lifted is 8.5 kg at a distance of 28.5 cm from the knee joint, the moment of inertia of the lower leg is 0.94 kg~m2, the muscle force is /450 N, and its effective perpendicular lever arm is 3.2 cm. Grade Summary a=|l Deductions Potential 1 (sing ) cos0 w0 J(=)(JO J(7)s)(9) Submissions ( cotan() | asin() | acos() ) ( E | @ ttegg;%;n;:f K:t%e ( atan() J( acotan() )| sinh() ) ( | etailed view (_cosh0 J(_ tanhQ J( cotanh( J(_ J(+)(-)( 0 J(.) @ Degrees O Radians D 994 Submission(s) Remaining U W= A Hints: 2 fora deduction. Hints remaining: Feedback: 3 fora deduction -Draw the free body diagram, including all the forces acting on the leg. - T Include the lever arms of these forces. -Use Newton's second law for rotations of the leg. = Part (b) How much work is done if the leg rotates through an angle of 20.5 with a constant force exerted by the muscle? net W=33.00 X