Question

homework 5 begin date: 8/17/2025 11:00:00 pm due date: 9/30/2025 11:59:00 pm end date: 9/30/2025 11:59:00 pm problem 2: (8% of assignment value) please answer the following questions about uniform circular motion. part (a) a planet orbits a star in a circular orbit at a constant orbital speed. which of the following statements is true? all of these are correct. none of these are correct. the planet experiences a centripetal force pulling towards its star. the planet experiences a centripetal force pushing it away from its star. the magnitude of the orbital velocity of the planet is unchanged, thus there is no acceleration and therefore no force is acting on the planet. hints: 4% deduction per hint. hints remaining: 1 feedback: 5% deduction per feedback. submit hint feedback i give up! part (b) when a planet is orbiting a star, which force plays the role of the centripetal force? part (c) which of the following statements about uniform circular motion is true? part (d) a student swings a ball on a string in a circle at a constant speed, then suddenly lets go of the string. when the student lets go of the string, what happens from a physics standpoint? all content © 2025 expert ta, llc

Explanation:

Step1: Recall centripetal - force concept

In uniform circular motion, a centripetal force acts towards the center of the circle. For a planet orbiting a star, the gravitational force provides the centripetal force pulling it towards the star.

Step2: Analyze each option

• Option 1: A planet in circular - orbit has centripetal force, so "The planet experiences no centripetal force" is false.
• Option 2: Centripetal force pulls inwards, not pushes away, so "The planet experiences a centripetal force pushing it away from its star" is false.
• Option 3: The planet in circular motion has centripetal acceleration due to the centripetal force (gravitational force here) pulling it towards the star, so "The magnitude of the orbital velocity of the planet is unchanged, thus there is no acceleration and therefore no force is acting on the planet" is false.

Answer:

None of these are correct.