Astronauts use a centrifuge to simulate the acceleration of a rocket launch. the centrifuge takes 40.0 s to speed up from rest to its top speed of 1 rotation every 1.20 s. the astronaut is strapped into a seat 4.00 m from the axis.

what is the astronaut's tangential acceleration during the first 40.0 s?

how many g's of acceleration does the astronaut experience when the device is rotating at top speed? each 9.80 m/s^2 of acceleration is 1 g.

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)