A student holds two lead weights, each of mass 7.4 kg. When the students’ arms are extended
horizontally, the lead weights are 1.1 m from
the axis of rotation and the student rotates
with an angular speed of 2.1 rad/sec. The
moment of inertia of student plus stool is
6.9 kg m2
and is assumed to be constant; i. e.,
the student’s arms are massless! Then the
student pulls the lead weights horizontally to
a radius 0.19 m from the axis of rotation. Calculate the final angular speed of the
system.
Answer in units of rad/s.

Aperson walking 1 mile everyday for exercise, leaving her front porch at 9: 00 am and returning to her front porch at 9: 25 am. what is the total displacement of her daily walk? a) 1 mileb) 0c) 25 minutes d) none of the above

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)

Which is the most accurate name for the ionic compound cas?