A volleyball is spiked so that its incoming velocity of +2.09 m/s is changed to an outgoing velocity of -24.6 m/s. The mass of t
1 answer:
Answer:
Impulse, J = 9.34 kg-m/s
Explanation:
Given that,
Mass of the volleyball, m = 0.35 kg
Initial velocity, u = +2.09 m/s
Final speed, v = -24.6 m/s
We need to find the magnitude of the impulse that the player applies to the ball. We know that impulse is equal to the change in momentum . So,
So, the magnitude of the impulse that the player applies to the ball is 9.34 kg-m/s.
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The kinetic energy gained by the air molecules is 0.0437 J
<h3 />Given:
Mass of a coffee filter, m = 1.5 g
Height from which it is dropped, h = 3 m
Speed at ground, v = 0.7 m/s
Initially, the coffee filter has potential energy. It is given by :
P = 1.5 × 10⁻³ kg × 9.8 m/s² × 3m
P = 0.0441 J
Finally, it will have kinetic energy. It is given by :
×
× 10⁻³ × (0.7)²
E = 0.000343 J
The kinetic energy Kair did the air molecules gain from the falling coffee filter is :
E = 0.000343 - 0.0441
= 0.0437 J
So, the kinetic energy Kair did the air molecules gain from the falling coffee filter is 0.0437 J
Learn more about kinetic energy here:
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