Question

Which of the following is true about a planet orbiting a star in the uniform circular motion? B. The speed of the plant is always changing. C. The velocity of the plant is constant. D. The acceleration vector of the plant points towards the center of the circle.

Answer 1

D. The acceleration vector of the plant points towards the center of the circle. (Works for Apex)

Step-by-step explanation:

Velocity is always changing because to have velocity you require direction and the direction is always changing when orbiting therefore A and C are not true. And B is not true because the speed of the planet is not accelerating when orbiting around a star.

Answer 2

Step-by-step explanation:

• If an object moves in a circular path, this type of motion is called uniform circular motion.
• The speed of the object is constant in this type of motion.
• As velocity is a vector quantity, it keeps on changing. It can be given by drawing tangent to the circle.
• Acceleration acts towards the center of circle.
• Hence, out of the given four options, the correct statement about a planet orbiting a star in uniform circular motion is (d) i.e. The acceleration vector of the plant points towards the center of the circle.