k = 50 N/m ell ele 0.5 kg X = -0.5 m X = 0.0 m X = 0.5 m A block of mass 0.5 kg on a horizontal surface is attached to a horizontal spring of negligible mass and spring constant 50 N/m. The other end of the spring is attached to a wall, and there is negligible friction between the block and the horizontal surface. When the spring is unstretched, the block is located at æ = 0 m. The block is then pulled to x = 0.5 m and released from rest so that the block-spring system oscillates between x = -0.5 m and x = 0.5 m, as shown in the figure. Which of the following claims is correct about the block's period of oscillation? A The period would increase if the block were released from rest at x = 0.8 m. The period would increase if the block had a mass of 1.2 kg. The period would increase if the spring had a spring constant of 75 N/m. The period would increase if the block-spring system was oriented vertically so that the block- spring system oscillates between y = -0.5 m and y = 0.5 m, the mass of the block is 0.5 kg, and the spring constant is 50 N/m.

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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.