In all of the experimental arrangements the mass of the knife-edge clamp is ignored. Is this an approximation because its mass is relatively small and can therefore be ignored, or is there some reason that it makes no contribution at all to the torque? Explain. 3) Measure the mass of the Aluminum "unknown" using the torque apparatus, and the volume using the vernier caliper. Then determine its density and quantitatively compare that density to the Aluminum density value listed in Appendix II of the lab manual (show all work). Your result should be a little bit high; what would be the primary cause of such an error? Explain

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)