The acceleration vector of a particle in uniform circularmotion a. points tangen

Question

The acceleration vector of a particle in uniform circularmotion a. points tangent to the circle, in the direction ofmotion. b. points tangent to the circle, opposite the direction ofmotion. c. is zero. d. points toward the center of the circle. e. points outward from the center of the circle. AND Without air resistance, an object dropped from a plane flyingat constant speed in a straight line will
a. quickly lag behind the plane. b. remain vertically under the plane. c. move ahead of the plane.
Please give me your insights as to what each response should be.Thank you in advance.
The acceleration vector of a particle in uniform circularmotion a. points tangent to the circle, in the direction ofmotion. b. points tangent to the circle, opposite the direction ofmotion. c. is zero. d. points toward the center of the circle. e. points outward from the center of the circle. AND Without air resistance, an object dropped from a plane flyingat constant speed in a straight line will
a. quickly lag behind the plane. b. remain vertically under the plane. c. move ahead of the plane. c. move ahead of the plane.
Please give me your insights as to what each response should be.Thank you in advance.

Explanation / Answer

    Given : a ) The acceleration vector of a particle in uniformcircular motion         . points toward thecenter of the circle         Consider a ball onthe end of a string, being rotated about an axis. The ballexperiences uniform circular motion, and is accelerated by thetension in the string, which always points toward the axis ofrotation. The magnitude of the tension of the string (and thereforethe acceleration of the ball) varies according to velocity andradius. If the ball is moving at a high velocity, the equationimplies, a large amount of tension is required and the ball willexperience a large acceleration b ) Without air resistance, an object dropped from aplane flying at constant speed in a straight line will              b. remain vertically under the plane. I hope it helps you

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