What two factors do u need to know to calculate how much work was done in any situation

Physics

2 answers:

pickupchik [31]3 years ago

7 0

U need force and direction to calculate work done.
W= FD

Dafna1 [17]3 years ago

5 0

Force and direction to calculate work done.
<span>W= FD</span>

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Natali5045456 [20]

Answer:

0.54

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A paintball’s mass is 0.0032kg. A typical paintball strikes a target moving at 85.3 m/s.

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Answer:

A) If the paintball stops completely the magnitude of the change in the paintball’s momentum is $p=0.273kg*m/s$

B) If the paintball bounces off its target and afterward moves in the opposite direction with the same speed, the change in the paintball’s momentum is $p=0.546kg*m/s$

C) A paintball bouncing off your skin in the opposite direction with the same speed hurts more than a paintball exploding upon your skin because of the strength exerted is twice than if it explodes.

Explanation:

A) We use the formula of momentum $p=mv$ , so we have $p=0.0032kg*85.3m/s=0.273kg*m/s$

B) We use the same formula above, then due we have a change of direction at the same speed, therefore the change in the momentum is the double so

$p=2*0.0032kg*85.3m/s=0.546kg*m/s$ .

C) The average strength of the force an object exerts during impact is determined by the amount the object’s momentum changes. therefore

$F=\frac{\Delta p}{\Delta t}$ , as we don't have any data about the impact time but we know momentum is twice, time does no matter and strength is twice too.