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- 8. One radian equals approximately Your answer 9. If a 14 kg box is raised to a height of 4.0 m on Earth, what is its gravitational potential energy relative to the ground? Your answer Submit Never submit passwords through Google Forms. This form was created inside of Newport News Public Schools. Report Abuse6. Spinning Ice Skater: A 50 kg ice skater is spinning around at 2 revolutions per second with her arms tucked in. You may consider her to be a cylinder 1.5 meters high with a radius of 15 cm. She sticks her arms straight out to slow herself down. Each of her arms is 2 kg and 75 cm long. How fast does she rotate with her arms extended?6. Find the angular momentum of Earth around the Sun. Also find the angular momentum of a rod about an axis passing through its edge. The length of the rod is 4 m and its mass is 500 g.
- Using these labels, explain why the person on the left rotates clockwise while the person on the right experiences no rotation (you may have to adjust your center of mass position). _____________________________________________________________________Question 13 An ice skater starts to spin with an angular velocity of 2 rotations per second, when she moves her arms close together her angular inertia goes down by a factor of 5, how fast would she rotate then? O 2/5 rotations per second O 5 rotations per second O 5/2 rotations per second O 10 rotations per second Question 14 What is the tangential velocity of a ladybug that is 20 cm from the center of a turntable rotating at 5 radians per second? Hint: Watch the units O 4 m/s O 1 m/s O 100 m/s O 0.04 m/s Question 15 What is the magnitude of the centripetal force keeping the ladybug of the above problem in circular motion? Use 2x10-5 kg for her mass. Hint: Watch the units O 1x104 N O 1x107 N 2x10 3 N O 1x105 N112... Astronomy In a little more than 5 billion years, our Sun will collapse to white dwarf approximately 16,000 km in diameter. (Ignore the fact that the Sun will lose mass as it ages.) (a) What will our Sun's angular momentum and rotation rate be as a white dwarf? (Express your answers as multiples of its present-day values.) (b) Compared to its present value, will the Sun's rotational kinetic energy increase, decrease, or stay the same when it becomes a white dwarf? If it does change, by what factor will it change? The radius of the Sun is presently 6.96 × 108 m. Example 9-14
- When a diver first leaves the diving platform their body is stretched out. When they tuck, what happens to their angular velocity and why?If you jump from a diving board and find that your body is rotating forward, you can spin your arms to stop the rotation and make your body land feet first. Explain in which direction you would rotate your arms and how this would help.Q1: Two planets of the same mass m are acted on only by the gravitational force of one upon the other. If the distance r between the planets is kept constant, what is the angular velocity of the line joining them?