USE THE STATEMENT AND FIGURE BELOW TO ANSWER THE NEXT FOUR QUESTIONS (8 through
ID: 1560534 • Letter: U
Question
USE THE STATEMENT AND FIGURE BELOW TO ANSWER THE NEXT FOUR QUESTIONS (8 through 11). The figure depicts a hockey puck sliding with a constant speed Vo in a straight line from point "a to point "b" on a frictionless horizontal surface. Forces exerted by the air are negligible. You are looking down on the puck. When the puck reaches point "b, " it receives a swift horizontal kick in the direction of the heavy print arrow. Had the puck been at rest at point "b, " then the kick would have set the puck in horizontal motion with a speed V in the direction of the kick. Which of the path A-E below would the puck most closely follow after receiving the kick? (B) (A) (B) (C) (D) (E) The speed of the puck just after it receives the kick is: (A) equal to the speed "Vo" it had before it received the kick. (B) equal to the speed "Vk" resulting from the kick and independent of the speed "vo". (C) equal to the arithmetic sum of the speeds "Vo" and "Vk". (D) smaller than either of the speeds "Vo" or "Vk". (E) greater than either of the speeds "Vo" or "Vk", but less than the arithmetic sum of these two speeds. Along the frictionless path you have chosen in question 8, the speed of the puck after receiving the kick: (A) is constant. (B) continuously increases. (C) continuously decreases. (D) increases for a while and decreases thereafter. (E) is constant for a while and decreases thereafter. Along the frictionless path you have chosen in question 8, the main force(s) acting on the puck after receiving the kick is (are): (A) a downward force of gravity. (B) a downward force of gravity and a horizontal force in the direction of motion. (C) a downward force of gravity, an upward force exerted by the surface, and a horizontal force in the direction of motion. (D) a downward force of gravity and an upward force exerted by the surface.(E) none. (No forces act on the puck.)Explanation / Answer
8 )
Option " B " is correct
because
as the both values of the speeds are here constant
the distance is covered is in linear in the time
9 )
the final velocity is Vo + Vk will be is larger
so Option E is correct
10 )
Option A is correct
when the kick is receiving the kick simply travels with the constant speed
11 )
Option " D " is correct
the downward force due to the gravity and the surface exert a normal force is equal to the weight and in up ward direction...
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