Question

FALSE STATEMENTS: All of the statements (a-e) below are false or nonsensical, either partially, or entirely. Give a brief explanation, sketch, and/or counter-example why, or under what circumstances the statement is false. Note that some of the statements may have multiple errors.

1 An object with centripetal acceleration must have a non-zero net torque acting on it.

2 Damping decreases the period of oscillation through a restoring force that opposes motion.

3 The power delivered on an object is equal to the impulse by the net force divided by the time.

4 A floating object has greater pressure on it pushing up than the force of gravity pulling it down.

5 in. projectile motion max height is achieved when the velocity is zero

Answer 1

1) Statement is false because Centripetal acelaration acts towards center of circle so Torque about center is zero because centripetal force always parallel to radius of circle so angle between them is zero so net torque is zero

ex- earth motion about sun angular momentum is conserved so

2)Damping acually increases the period of oscillation and it does by damping force which is proportional to velocity of object.

example - damped harmonic oscillator

3)statement is not dimensionally correct , moemtum delievered to an object is equal to the impulse and it is equal to force multiplied by time

4) The floating object have net bouyancy force which is equal to the force of gravity pulling it down that;s why it floats

ex- floating of ice over water

5) in projectile motion max height is achieved when verticle velocity is zero,