An ice hockey puck slides along the ice at 12m/s. A hockey stick delivers an impulse of 4.0kg*m/s causing the puck to move off in the opposite direction with the same speed.
What is mass of puck?
look at the units!
(__kg)(12m/s)=4.0kg*m/s
.16667
To determine the mass of the puck, we can use the concept of impulse. Impulse is a change in momentum and is calculated by multiplying the force applied to an object by the time it acts. In this case, the impulse delivered by the hockey stick to the puck is given as 4.0 kg*m/s.
The momentum of an object is the product of its mass and velocity. Since the puck's initial velocity is 12 m/s and the impulse applied causes it to move in the opposite direction with the same speed, the change in momentum is given by:
Change in Momentum = Final Momentum - Initial Momentum
Since the final momentum is in the opposite direction, it will be negative. Therefore, we have:
-4.0 kg*m/s = (mass of the puck) * (final velocity - initial velocity)
Substituting the given values, we have:
-4.0 kg*m/s = (mass of the puck) * (-12 m/s - 12 m/s)
-4.0 kg*m/s = (mass of the puck) * (-24 m/s)
Now, we can solve for the mass of the puck:
mass of the puck = (-4.0 kg*m/s) / (-24 m/s)
mass of the puck = 0.167 kg (rounded to three decimal places)
Therefore, the mass of the puck is approximately 0.167 kg.