9) In a perfectly ELASTIC collision between two perfectly rigid objects A) both

Question

9) In a perfectly ELASTIC collision between two perfectly rigid objects A) both the momentum and the kinetic energy of the system are conserved. B) the momentum of each object is conserved. e momentum of the system is conserved but the ki conserved. D) netic en of the system is not E) the kinetic energy of the system is but the momentum of the system is not conserved. conserved, the kinetic ener of each ob is conserved. rgy ject Points: 1. 0) A horizontal disk rotates about a vertical axis through its center. Point P is midway between 10 the center and the rim of the disk, and point Q is on the rim. If the disk turns with constant than r velocity, which of the following statements about it are true? (There may be more one correct A) The linear of Q is twice as great as the linear acceleration of P acceleration C) he linear acceleration of P is twice as great as the linear acceleration of Q. D) The angular of Q is twice as great as the angular of p E) P and Q have the same linear acceleration is moving twice as fast as P. Points: 2 11) A cable is 100 m long, has a cross-sectional area of 1.0 mm2, and is made of a material having a Young's modulus of 1.0x 1011 N/m2. If a 1000-N ce is applied to stretch the cable, how far does it stretch? A) 0,010 m B) 0,0010 m C) 0.10 m D) 1.0 m E) 10 m

Explanation / Answer

9. (A) momentum is always conserved, in elastic energy is also conserved.

10. (A)and(E)

since, angular velocity =w= constant

And, linear acceleration is given by,

a= w^2*R ...............(1)

and, linear velocity,

v= w*R ...................(2)

11. (D)young modulus= (F/area)/(change in length/L)

let x m

so, 1*10^11= 100*1000/(x*10^-6)

so, x= 1m

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