ANSWER EACH QUESTION AND EXPLAIN THE REASONING BEHIND YOUR ANSWER CHOICES 1) Whi

Question

ANSWER EACH QUESTION AND EXPLAIN THE REASONING BEHIND YOUR ANSWER CHOICES

1) Which of the following is an accurate statement?

A. The magnitude of a vector can be zero even though one of its components is not zero.

B. It is possible to add a scalar quantity to a vector.

C. Even though two vectors have unequal magnitudes, it is possible that their vector sum is zero.

D. Rotating a vector about an axis passing through the tip of the vector does not change the vector.

E. The magnitude of a vector is independent of the coordinate system used.

2) The speed of a wave pulse on a string depends on the tension, F, in the string and the mass per unit length, ?, of the string. Tension has units of kg · m · s-2 and the mass per unit length has units of kg · m-1. What combination of F and ? must the speed of the wave be proportional to?

A. F / ?

B. ? / F

3) Two cars travel along a level highway. It is observed that the distance between the cars is increasing. Which one of the following statements concerning this situation is necessarily TRUE (applies only to this situation)?

A. The velocity of each car is increasing.

B. At least one of the cars has a non-zero acceleration.

C. The leading car has the greater acceleration.

D. The trailing car has the smaller acceleration.

E. Both cars could be accelerating at the same rate.

4) Suppose that a car traveling to the west (the –x direction) begins to slow down as it approaches a traffic light. Which statement concerning its acceleration in the x direction is correct?

A. Upward

B. Both its acceleration and its velocity are positive.

C. Both its acceleration and its velocity are negative.

D. Its acceleration is positive but its velocity is negative.

E. Its acceleration is negative but its velocity is positive.

5) Suppose that an object is moving with constant nonzero acceleration. Which of the following is an accurate statement concerning its motion?

A. In equal times its speed changes by equal amounts.

B. In equal times its velocity changes by equal amounts.

C. In equal times it moves equal distances.

D. A graph of its position as a function of time has a constant slope.

E. A graph of its velocity as a function of time is a horizontal line.

6) Suppose Shirley is driving along in an open car and throw a ball straight up into the air. While the ball is still in the air you maintain a constant velocity. Where does the ball land relative to the car? Neglect air resistance.

A. the ball lands in the car

B. the ball lands behind the car

C. the ball lands in front of the car

D. the ball explodes in mid-air

7) In two or three-dimensional motion, the velocity vector is …?

A. Always tangent to the path.

B. Always perpendicular to the path.

C. Can have both a tangential and perpendicular component to the path.

D. Always points in the same direction as the acceleration vector.

8) For general projectile motion, when the projectile is at the highest point of its trajectory …?

A. its acceleration is zero.

B. its velocity is perpendicular to the acceleration.

C. its velocity and acceleration are both zero.

D. the horizontal component of its velocity is zero.

E. the horizontal and vertical components of its velocity are zero.

9) Paul kicks a football with a speed of 22 m/sec at an angle of 60.0o to the positive x direction. At the same instant, Abdul rides past the football in a car that moves with a constant speed of 11 m/sec in the positive x direction. Complete the following statement: According to the observer in the car, the ball will …?

A. Follow a parabolic path

B. Follow a hyperbolic path

C. Follow a path that is straight up and down in the y direction

D. Follow a path that is straight across in the +x direction

E. Follow a straight line that is angled (less than 90o ) with respect to the x direction

Explanation / Answer

1)
A) False
B) False
C) False
D) False

E) True

2) E) sqrt(F/u)

3)
A) False
B) False
C) True
D) True

4)

A) False
B) False
C) False
D) True

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