Whish expression(s) gives you the magnitude the CENTRIPETAL FORCE? a) F_e = mv^2

Question

Whish expression(s) gives you the magnitude the CENTRIPETAL FORCE? a) F_e = mv^2 b) F_c = mv^2/r c) F_c = mr^2 omega d) B and C A point on a standing wave that is always stationary is a(n) _____ and the one which oscillates at maximum amplitude is a(n) _____. a) minimum -- maximum b) constructive--destructive c) antinode -- node d) node -- antinode Which one of the velocity graphs correctly presents the velocity of an object with given position versus time graph? Two identical buckets are filled to the brim with water, but one of them has a piece of wood floating in it. Which bucket is heavier? a) Bucket A b) Bucket B c) Both buckets will have the same weight. d) Heavier bucket cannot be identified without knowing the type of wood. In previous question, the buoyancy phenomenon can be explained by _____ a) Archimedes' Principle b) Law of gravitation c) Hooke's Law d) incompressibility of water

Explanation / Answer

(1) Centripetal force F = mv2/r

and F= mr2w

Both are correct

so option D is correct

(2) Stationary points in standing waves are nodes

and which oscillates with maximum displacement are called antinodes

Option d is correct

(3) Here first velocity was positive then become zero and finally it become negative

so option c is correct

(4) In equilibrium wood will displace the water

and weight of displaced water will be equal to the weight of wood

So both bucket will have smae weight

Option C is correct

(5) We used Archimedes Principle

Option A

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