12 Questions
| Total Attempts: 198

Questions and Answers

- 1.If two vectors are given such that A + B = 0, what can you say about the magnitude and direction of vectors A and B?
- A.
Same magnitude, but can be in any direction

- B.
Same magnitude, but must be in the same direction

- C.
Different magnitudes, but must be in the same direction

- D.
Same magnitude, but must be in opposite directions

- E.
Different magnitudes, but must be in opposite directions

- 2.Given that A + B = C, and that lAl
^{2}+ lBl^{ 2}= lCl^{2}, how are vectors A and B oriented with respect to each other?- A.
They are perpendicular to each other

- B.
They are parallel and in the same direction

- C.
They are parallel but in the opposite direction

- D.
they are at 45° to each other

- E.
They can be at any angle to each other

- 3.If each component of a vector is doubled, what happens to the angle of that vector?
- A.
It doubles

- B.
It increases, but by less than double

- C.
It does not change

- D.
It is reduced by half

- E.
It decreases, but not as much as half

- 4.A certain vector has x and y components that are equal in magnitude. Which of the following is a possible angle for this vector, in a standard x-y coordinate system?
- A.
30°

- B.
180°

- C.
90°

- D.
60°

- E.
45°

- 5.You are adding vectors of length 20 and 40 units. What is the only possible resultant magnitude that you can obtain out of the following choices?
- A.
0

- B.
18

- C.
37

- D.
64

- E.
100

- 6.A small cart is rolling at constant velocity on a flat track. It fires a ball straight up into the air as it moves. After it is fired, what happens to the ball?
- A.
It depends on how fast the cart is moving

- B.
It falls behind the cart

- C.
It falls in front of the cart

- D.
It falls right back into the cart

- E.
It remains at rest

- 7.You drop a package from a plane flying at constant speed in a straight line. Without air resistance, the package will:
- A.
Quickly lag behind the plane while falling

- B.
Remain vertically under the plane while falling

- C.
Move ahead of the plane while falling

- D.
Not fall at all

- 8.From the same height (and at the same time), one ball is dropped and another ball is fired horizontally. Which one will hit the ground first?
- A.
The “dropped” ball

- B.
The “fired” ball

- C.
They both hit at the same time

- D.
It depends on how hard the ball was fired

- 9.A projectile is launched from the ground at an angle of 30
^{o}. At what point in its trajectory does this projectile have the least speed?- A.
Just after it is launched

- B.
At the highest point in its flight

- C.
Just before it hits the ground

- D.
Halfway between the ground and the highest point

- E.
Speed is always constant

- 10.The spring-loaded gun can launch projectiles at different angles with the same launch speed. At what angle should the projectile be launched in order to travel the greatest distance before landing?
- A.
15°

- B.
30°

- C.
45°

- D.
60°

- E.
75°

- 11.You’re on the street, trying to hit a friend with a water balloon. He sits in his dorm room window above your position. You aim straight at him and shoot. Just when you shoot, he falls out of the window! Does the water balloon hit him??
- A.
Yes, it hits

- B.
Maybe – it depends on the speed of the shot

- C.
The shot is impossible

- D.
No, it misses

- E.
Not enough information

- 12.It was reported in World War I that a pilot flying at an altitude of 2 km caught in his bare hands a bullet fired at the plane! According to what you know about kinematics and the acceleration of gravity, could this be possible?
- A.
Yes! But very unlikely.

- B.
No! That's ridiculous.

- C.
WTF?!

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