Bullet striking a block of wood
A rifle with a barrel length of 64 cm fires a 9 g bullet with a horizontal speed of 450 {rm m/s}. The bullet strikes a block of wood and penetrates to a depth of 12 cm.
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A 13 g bullet traveling 236 m/s penetrates a 2.0 kg block of wood and emerges cleanly at 179 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges?
The concentration of C20H42 (FM 282.55) in winter rainwater is 0.2 ppb. Assuming that the density of rainwater is close to 1.00 g/mL, find the molar concentration of C20H42.
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How much heat is required to raise the temperature of 0.362kg of copper from23.0C to 60.0 C. The specific heat is 0.920 (g. C).
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