At what speed should a hockey puck with a mass of 160g move, so that its impulse would be equal to that of a ball with a mass of 7.9g, which flies at a speed of 500m / s?
To find the speed of movement of the considered hockey puck, we use the equality: m * V = P (impulse of the puck, ball) = msh * Vsh, whence we express: Vsh = m * V / msh.
The values of the variables: m is the mass of the ball (m = 7.9 g = 7.9 * 10-3 kg); V – ball speed (V = 500 m / s); msh – the mass of the hockey puck (mw = 160 g = 160 * 10-3 kg).
Let’s perform the calculation: Vsh = m * V / msh = 7.9 * 10-3 * 500 / (160 * 10-3) ≈ 24.7 m / s.
Answer: The speed of movement of the hockey puck in question should be 24.7 m / s.
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