Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling.Reason (R): If no external force acts on a system, its momentum cannot change.Codes:

For Competitive Exams

Assertion (A): A man standing on a completely frictionless surface can propel himself by whistling.
Reason (R): If no external force acts on a system, its momentum cannot change.
Codes:

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

Next Question

Consider the following statements: A simple pendulum is set into oscillation. Then:
1. the acceleration is zero when the bob passes through the mean position.
2. in each cycle the bob attains a given velocity twice.
3. both acceleration and velocity of the bob are zero
when it reaches its extreme position during the oscillation.
4. the amplitude of oscillation of the simple pendulum decreases with time.
Which of these statements are correct?

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