Angular Momentum: A ballerina spins initially at 1.5 rev/s when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg ? m2, and her angular speed increases to 4.0 rev/s. What was her initial moment of inertia?
Fill in the blank(s) with the appropriate word(s).
2.3 kg ? m2
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An electron has a relativistic momentum of 1.1 × 10-21 kg-m/s. What fraction of its total energy is its kinetic energy?
What will be an ideal response?
Water is vital to life on our planet. Most of Earth's water supply is in the
A) oceans. B) ice caps. C) rivers, lakes, and streams. D) ground.
The graph above shows 4 models for how the average distance between galaxies could change with time, from the past (left) to now (middle) to the future (right-hand side). The graph also shows real data, based on white dwarf supernovae. Which model(s) predict(s) that galaxies are getting farther apart NOW?
A) accelerating B) coasting C) critical D) recollapsing E) all of them
A 60-kg person rides down an icy hill of 20° slope while standing on a 3.0-kg flat-bottomed bathroom scale. Assume there is no frictional force between the bottom of the scale and the hill. The static friction force the scale exerts on the person is
a. 0 N. b. 201 N. c. 211 N. d. 553 N. e. 580 N.