Question

when a bat hits a ball, what is the impulse?
the mass multiplied by the force
the force multiplied by the time the objects are in contact
the change in velocity multiplied by the force
the mass multiplied by the acceleration

Explanation:

Impulse in physics is defined as the product of the force applied and the time duration for which the force acts (when a bat hits a ball, the force from the bat acts on the ball for a short time). Let's analyze each option:

• Option 1: Mass multiplied by force is not the definition of impulse.
• Option 2: By the definition of impulse ($J = F\times\Delta t$), this is correct as it's force times the contact time.
• Option 3: Change in velocity multiplied by force is not related to the definition of impulse.
• Option 4: Mass multiplied by acceleration is the definition of force ($F = ma$), not impulse.

Answer:

B. the force multiplied by the time the objects are in contact