This question is incomplete, the missing diagram is uploaded along this answer below.

**Answer:**

**- **the magnitude of the tension force exerted by the hamstring muscles on the leg is **990 N**

**- **the magnitude of compression force at the knee joint is **900 N**

**Explanation:**

Given the data in the question and diagram below;

Net torque = 0

Torque = force × lever arm

so

F × ( 15.0 in + 1.5 in ) = T × 1.5 in

given that F = 90 N

90 × ( 15.0 in + 1.5 in ) = T × 1.5 in

90 N × 16.5 in = T × 1.5 in

T = ( 90 N × 16.5 in ) / 1.5 in

T = **990 N**

Therefore, the magnitude of the tension force exerted by the hamstring muscles on the leg is **990 N**

b) magnitude of compression force at the knee joint;

In equilibrium, net force = 0

along horizontal

F - T + F = 0

we substitute

F - 990 + 90 = 0

F - 900 = 0

F = **900 N**

Therefore, the magnitude of compression force at the knee joint is **900 N**