Two speeding lead bullets, one of mass 12.5 g moving to the right at 250 m/s and one of mass 7.55 g moving to the left at 395 m/s, collide head-on, and all the material sticks together. Both bullets are originally at temperature 30.0°c. Assume the change in kinetic energy of the system appears entirely as increased internal energy. We would like to determine the temperature and phase of the bullets after the collision. (Lead has a specific heat of 128 3/(kg K), a melting point of 327.3°C, and a latent heat of fusion of 2.45 x 10* /kg.) (a) What analysis model is appropriate for the system of two bullets for the time interval from before to after the collision? particle in equilibrium isolated system (momentum) particle under a net force nonisolated system (momentum) (b) From the model, what is the speed of the combined bullets after the collision? m/s (c) How much of the initial kinetic energy has transformed to internal energy in the system after the collision?
Two speeding lead bullets, one of mass 12.5 g moving to the right at 250 m/s and one of mass 7.55 g moving to the left at 395 m/s, collide head-on, and all the material sticks together. Both bullets are originally at temperature 30.0°c. Assume the change in kinetic energy of the system appears entirely as increased internal energy. We would like to determine the temperature and phase of the bullets after the collision. (Lead has a specific heat of 128 3/(kg K), a melting point of 327.3°C, and a latent heat of fusion of 2.45 x 10* /kg.) (a) What analysis model is appropriate for the system of two bullets for the time interval from before to after the collision? particle in equilibrium isolated system (momentum) particle under a net force nonisolated system (momentum) (b) From the model, what is the speed of the combined bullets after the collision? m/s (c) How much of the initial kinetic energy has transformed to internal energy in the system after the collision?
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Transcribed Image Text:Two speeding lead bullets, one of mass 12.5 g moving to the right at 250 m/s and one of mass 7.55 g moving to the left at 395 m/s,
collide head-on, and all the material sticks together. Both bullets are originally at temperature 30.0°C. Assume the change in kinetic
energy of the system appears entirely as increased internal energy. We would like to determine the temperature and phase of the bullets
after the collision. (Lead has a specific heat of 128 3/(kg K), a melting point of 327.3°C, and a latent heat of fusion of 2.45 x 10* 1/kg.)
(a) What analysis model is appropriate for the system of two bullets for the time interval from before to after the collision?
particle in equilibrium
isolated system (momentum)
particle under a net force
nonisolated system (momentum)
(b) From the model, what is the speed of the combined bullets after the collision?
m/s
(c) How much of the initial kinetic energy has transformed to internal energy in the system after the collision?
(d) Does all the lead melt due to the collision?
Yes
O No
(e) What is the temperature of the combined bullets after the collision?
(1) What is the phase of the combined bullets after the collision?
mulet, solid
muilet, liquid
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