Two cars collide and stick together. Why is energy not conserved in this collisi

Question

Two cars collide and stick together. Why is energy not conserved in this collision? Where does the energy go? The cars stick together so energy is lost and heat is produced. b. A bullet(m2= 12.0 g) travelling to the left collides with a block(m1= 1.00 kg) travelling to the right. The bullet embeds itself in the block. If v1 = 4.00m /s and v2 = 320m /s: i. What is the final velocity of the block-bullet system? [ 0.158m /sxˆ ] ii. Is energy conserved in this collision? Support your answer. [no] iii. If the collision occurs in 0.005 s, what force is exerted on the big block ? [

Explanation / Answer

here ,

when two cars collide and stick together due to this collision , cars deform and sound and heat energy is produced.

this energy will be lost as heat and sound energy

b)

m2 = 12 gm

m1 = 1 Kg

v1 = 4 m/s

v2 = 320 m/s

i) let the final velocity is vf

Using conservation of momentum

m1 * v2 - m2 * v2 = (m1 + m2) * vf

(0.012 + 1) * vf = -0.012 * 320 + 1 * 4

solving for vf

vf = 0.158 m/s

the final velocity of the block-bullet system is 0.158 m/s

ii)

No , as the bullet and block sticks together after the collision

the energy is NOT conserved in this collision

iii)

force extered on the big block = m1 * (v1 - vf)/time

force extered on the big block = 1 * (4 - 0.158)/.005

force extered on the big block = 768.4 m/s

the force extered on the big block is 768.4 m/s

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.