A thin empty frame is hung along side A (see figure). Side A is 1.19 m long and side B is 0.957 m long. Side C is hit by a bullet with a mass of 26.0 g, an initial velocity of 148.08 m/s and a final velocity of −118 m/s. Calculate the energy loss during the impact if the frame rotates frictionlessly around the z-axis and the frame's moment of inertia around this axis is 1,885 kg · m². Assume that the ball bounces straight back after the impact.

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.