When a collision is completely inelastic, then:
a. all the kinetic energy is conserved. c. the participants stick together.
b. all the kinetic energy is gone.
d. the total momentum is zero.
[Ques. 2] In an electrophoresis experiment, the terminal speed of a particular DNA fragment is vT . If the experiment is repeated with identical fragments with the voltage between the plates producing the field increased by 50, what new terminal speed would occur? Choose the closest answer.
a. 1.6 vT
c. 2.3 vT
b. 1.5 vT.
d. 0.50 vT
[Ques. 3] A baseball infielder, mass 75.0 kg, jumps up with velocity 2.00 m/s and catches a 0.150-kg baseball moving horizontally at 50.0 m/s. Of the following, which is closest to the final momentum of the system, infielder and baseball?
a. 158 kgm/s
c. 152 kgm/s
b. 155 kgm/s
d. 150 kgm/s
[Ques. 4] A closed surface contains the following point charges: 6 C, -4 C, 2 C, 4 C. The electric flux coming out of the surface is:
a. 16 C/eo.
c. 16 C/eo.
b. 4 C/eo.
d. 4 C/eo.
[Ques. 5] A billiard ball (Ball 1) moving at 5.00 m/s strikes a stationary ball (Ball 2) of the same mass. After the elastic collision, Ball 1 moves at a speed of 3.50 m/s. Find the speed of Ball 2 after the collision.
a. 1.25 m/s
c. 2.16 m/s
b. 1.50 m/s
d. 3.57 m/s
[Ques. 6] A spherical volume of space has an electric field of intensity 170 N/C directed radially outward from it surface of radius 0.600 m. What is the net charge enclosed within this surface?
a. 6.8 nC
c. 4.0 nC
b. 4.0 nC
d. 6.8 nC
[Ques. 7] In a system with two moving objects, when a collision occurs between the objects:
a. the total kinetic energy is always conserved. b. the total momentum is always conserved. c. the total kinetic energy and total momentum are always conserved. d. neither the kinetic energy nor the momentum is conserved.
[Ques. 8] A charge, +Q, is placed inside a balloon and the balloon is inflated. As the radius of the balloon r increases the number of field lines going through the surface of the balloon:
a. increases proportional to r2.
c. stays the same.
b. increases proportional to r.
d. decreases as 1/r.
[Ques. 9] A 5-kg object is moving to the right at 4 m/s and collides with another object moving to the left at 5 m/s. The objects collide and stick together. After the collision, the combined object:
a. is moving to the right.
b. is moving to the left.
c. is at rest.
d. has less kinetic energy than the system had before the collision.
[Ques. 10] A thin uncharged conducting spherical shell has a charge q carefully placed at its center through a small hole in the shell. The charge q does not touch the shell. What is the charge on the shell?
a. 2q
c. q
b. 0
d. -q
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