Q4. [4 pts] A kid throws a ball vertically upward, and we measure that It reache
ID: 1659056 • Letter: Q
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Q4. [4 pts] A kid throws a ball vertically upward, and we measure that It reaches a maximum height of 10 m. A professional pitcher tries the same thing, and the ball leaves his hand at twice the speed of the kid's throw. How high does the ball go? (you may neglect the effect of air resistance [A] 40 m [B] 20 m [C] 10 m [D] 80 m [E] 42 m Q5. [4 pts] A ball dropped from a height of 9.0 m above the ground takes a certain time, t, to reach the ground. How long would a ball dropped from a height of 1.0 m take to reach the ground? (you may neglect the effect of air resistance) [A] t/81 [ t/9 [C] t/3 [D] t [E] 9t [F] None of these 06. [4 pts] A driver applies the brakes on his car reducing its speed from 41.0 m/s to 11.0 m/s in a time 5.0 secs while traveling a distance of 121 m. What is the magnitude of the car's average acceleration during the 5.0 sec period? [A] 8.2 m/si 1B) 8.2 m/s [C] 24.2 m/s D] 6.0 m/s Q7. 15 pts] A ladder of length 4.00 m is leaned against a vertical wall. The ladder AJ 3.46 m [B] 0.50 m [CI4.62 m (D] 2.00 m [E] None of these makes an angle of 60.0 degrees to the horizontal floor. How far from the wall does the ladder touch the ground? Q8. If the distance d (in meters) traveled by an object in time t (in seconds) is given by the formula d-A+Bt+ Ct, then: (a) [2 pts] the SI units of A are [F] None of these [A] m [B]s [C)m/s [D] m/s?E] ms (b) [2 pts] the SI units of Bare [D] m/s EmsIF] None of these [A] m B]s [C] m/s (c) [2 pts] the SI units of Care [A] m [B]s IC]m/s [D] m/s? E ms IF] None of these Q9. [4 pts] What is 75 cm in inches? A] 187.5 in [B] 25 in [C] 30 in [D] 15 in [E] None of these Q10. [5 pts] The dimensions of the basketball court are 94.0 feet by 50.0 feet. What is the area of the basketball court in m2? (1 foot - 0.305 m) AJ 437 m2 [B] 1410 m2 [C] 4700 m2 [D] 2.10 m2 [E] 0.507 m2 Q11. [4 pts] If you simultaneously drop the two balls of the same size, one with mass of 20 kg and the other 2 kg, which will hit the ground first? [A] the more massive one [C] they hit the ground at the same time [D] None of these [B] the less massive oneExplanation / Answer
4. h = v^2 / 2 g
h / 10 = (2v / v)^2 = 4
h = 40 m Ans(A)
5. t = sqrt(2h/g)
t'/t = sqrt(1/9)
t' = t/3 Ans(C)
6. vf = v0 + a t
41 = 11 + 5 a
a = 6 m/s^2 Ans(D)
7. cos60 = d / 4
d = 4 cos60 = 2 m Ans(D)
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