Final answer:
To find the angular momentum of a rotating bar, the cross product of the position vector and linear momentum is needed, but the absence of specific details in the question prevents providing a numerical answer. The concept of torque is similarly based on the cross product of the lever arm and the force.
Step-by-step explanation:
To calculate the angular momentum of a particle or object, you need to use the cross product of the position vector and the linear momentum vector. For a rotating bar with a mass of 550 g, the process involves converting the mass to kilograms, determining the perpendicular distance to the axis of rotation, finding the angular velocity, and then using the formula L = r x p, where L is the angular momentum, r is the position vector, and p is the linear momentum. However, without specific details on velocity, position, and the axis of rotation, we cannot provide a numerical answer. To address torque, you would use the formula τ = r x F, where τ is the torque, r is the lever arm, and F is the force. Remember, torque and angular momentum are vectors, and their direction depends on the right-hand rule.