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Physics Final Exam Review 2
Test Description: This is a review of all physics topics taught over a school year.
Instructions: Answer all questions to get your test result.
1) A 4.0kg ball is moving at 6.0m/s directly toward a 2.0kg ball which is at rest. They collide and stick together. What is the velocity after the collison? vf=(m1v1+m2v2)/(m1+m2)
A
3 m/s
B
4.3 m/s
C
3.3 m/s
D
4 m/s
2) You are on a roller coaster and you are momentarily lifted out of your seat when dropped at the top of a very high hill. You feel weightless because
A
the pull of the sun balances out the pull of the Earth at that height.
B
you are in free fall as your chair drops suddenly.
C
there is no gravity at that height.
D
you are not accelerating at that point.
3) A student lifts her 42kg body 0.25meters in 2seconds. How much power is she exerting? (weight=mass x gravity) (P=Fd/t)
A
51.5 watts
B
102.9 watts
C
10.5 watts
D
21 watts
4) A positive charge attracts object X. A negative charge repels object Y. Object X is attracted to object Y. (alternation of positive and negative charges)
A
Object X has a positive charge. Object Y has a positive charge.
B
Object X has a positive charge. Object Y has a negative charge.
C
Object X has a negative charge. Object Y has a positive charge.
D
Object X has a neutral charge. Object Y has a negative charge.
5) Demonstrate your knowledge of Coulomb's law if Q1 is 1.6 x 10^-13 C, Q2 is 1.6 x 10^-13 C, and d is 0.50 m (k = 9x10^9 N/m^2/C^2) (F=k•Q1•Q2/d^2)
A
0.0827 N
B
1.024 x 10^-25 N
C
9.2 x 10^-16 N
D
0.704 N
6) A negative point charge placed at point A will move toward the right.
A
A negative point charge placed at point A will move toward the left.
B
A negative point charge placed at point A will move toward the right.
C
The electric field is strongest nearest point B.
D
The charges on both B and C are positive.
7) Suppose the value of one resistor is 40 ohms, and the value of the second resistor is 10 ohms. What is the equivalent resistance? Req = (R x R) / (R + R)
A
.125 ohms
B
30 ohms
C
50 ohms
D
8 ohms
8) A circuit has a resistance of 2.0 ohms and a 24 V battery. What is the current?
A
4.0 A
B
0.50 A
C
12 A
D
2.0 A
9) The lines of magnetic field from a bar magnet for closed lines. By convention, the field direction is taken to be
A
outward from the north pole and inward to the south pole
B
outward from the north pole and outward to the south pole.
C
inward from the north pole and inward from the south pole.
D
inward from the north pole and outward to the south pole.
10) Which is not a way to make an electromagnet stronger?
A
changing the material used for the core
B
changing the current in the wire
C
using a thicker wire
D
changing the number of coils of wire
*select an answer for all questions
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