3. A 2.0 kg pulley, assumed to be a cylinder, is fixed at a height of 6.0 m and rotates with a constant angular velocity of 20 rad/s. If the mechanical
energy of the pulley is 300 J, what is its radius? [7 marks]

Alinear relationship would look like a straight line on the graph. it could have a positive negative or 0 slope. so it could be a line potentially going in any direction but it must be perfectly straight.

Each student aligns the edge of the object with the left edge of the ruler as shown above. all four students read the ruler with a measurement of 4.6 cm. which statement describes the data they collect? i believe the answer is: the data have poor precision and poor accuracy because of a systematic error.