78cm 66cm 56cm 46cm 37cm Solution A 10-g bulletmoving 1000 m/s strikes and passe
ID: 1739828 • Letter: 7
Question
78cm
66cm
56cm
46cm
37cm
Explanation / Answer
A 10-g bulletmoving 1000 m/s strikes and passes through a 2.0-kg block initiallyat rest, as shown. The bullet emerges from the block with a speedof 400 m/s. To what maximum height will the block rise above itsinitial position? 78cm 66cm 56cm 46cm 37cm EXPLANATION: {Conservation Of Momentum}: ----> {Final System Momentum} = {Initial System Momentum} ----> (m_bullet)*(v_bullet_final) +(m_block)*(v_block_final) = (m_bullet)*(v_bullet_init) + (0) ----> (10.0e-3)*(400) +(2.0)*(v_block_final) = (10.0e-3)*(1000) + (0) ----> (v_block_final) = 3.0 m/sec {Block Initial Kinetic Energy} = {Max Potential Energy} ----> (1/2)*(m_block)*(v_block_final)^2 = (m_block)*g*(h_max) ----> (h_max) = (1/2)*((v_block_final)^2)/g ----> (h_max) = (1/2)*((3 m/sec)^2)/(9.8) ----> (h_max) = 0.4592 m = 46 cm .
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