Page 2 of 10 PART A - MULTIPLE CHOICE ANSWER EACH OF THE FOLLOWING USING THE SHEET PROVIDED. CHOOSE ONLY ONE RESPONSE FOR EACH QUESTION. 1. An object is thrown with a speed of 24 m/s at an angle of 470 to the horizontal. The horizontal component of its motion is: a) 24sin470 m/s b ) 24cos430 m/s 24cos470 m/s 24tan470 m/s 2. Two vectors r and s are shown below: Which of the following would most accurately represent r + s? a ) c) d) 3. Which of the following would most accurately represent r - s? a ) b) d ) 4 A property of an inertial frame of reference is that it is: not in motion relative to other inertial frames of reference distinguishable from other inertial frames of reference a frame in which Newton's first law of motion holds not in motion relative to the Earth 5 Muons should decay after travelling 660 m into the atmosphere from space, yet they are detected on the Earth's surface. This is evidence that: "shower o osmic rays from Sun a) time contracts for objects in motion length increases for objects in motion mass decreases for objects in motion none of the above some muons decay before reaching surface reach surface Earth Thought experiments were important to the development of special relativity because at that time: scientists did not perform experiments about light scientists did not think experiments were important it was impossible to achieve speeds close to the speed of lightA property of an inertial frame of reference is that it is: not in motion relative to other inertial frames of reference distinguishable from other inertial frames of reference a frame in which Newton's first law of motion holds not in motion relative to the Earth 5 Muons should decay after travelling 660 m into the atmosphere from space, yet they are detected on the Earth's surface. This is evidence that: thenver of time contracts for objects in motion length increases for objects in motion mass decreases for objects in motion none of the above before muching surface some givons Earth 6. Thought experiments were important to the development of special relativity because at that time: scientists did not perform experiments about light scientists did not think experiments were important it was impossible to achieve speeds close to the speed of light scientists only believed in thought experiments An alien measures the length of a pipe here on Earth to be 65 cm. The alien then steals the pipe, and travels at close to the speed of light. While the ship is in motion, they measure the length again and it is. a) 65 cm c) less than 65 cm b ) more than 65 cm d ) depends on the direction of travel 8. The inertia of an object is most closely related to its density shape g mass volume 9. Which of the following statements is always true? If an object is at rest, no forces act on it If an object is moving, an unbalanced force acts on it If an object is moving, it has a natural tendency to keep moving If an object is moving, it has a natural tendency to come to rest 10. The acceleration of a moving object is always in the direction of the initial velocity c) of the frictional force ge of the final velocity d) of the net force