Please solve with explination MULTIPLE CHOICE: (Questions 1-20): Use a pencil to
ID: 1657922 • Letter: P
Question
Please solve with explination
MULTIPLE CHOICE: (Questions 1-20): Use a pencil to carefully I in the bubble on the Scantron card 100 corresponding to the alternative that best completes the statement or answers the question 1. A ball is tossed straight up in the air. When it reaches its very highest pointwhich one of the following is true about the ball's acceleration vector, a ? A. a is undefined D. à is changing direction B. acquals zero E. a points upward a points downward 6. The velocity V, in meters/second, of an object is given by the equation V, A + Br + CMA, where represents time in second A.m/s, n/s, m/s B. m/s, m/s, m/s' E. m/s, m/s m, m/s, m/s 7. The ball rolls up the ramp, then back down. Which is the correct acceleration graph? 2. Let y, v, and a represent the e-components of the position, velocity and acceleration vectors of the particle whose motion is represented in the picture at right. Which of the following statements is true? A. y>0, v,>0 and a,90 By>0, v0 and a 0 C.y > 0, V, 0 and D. y0 and a 0 A. (a) B. (b) C. (c) ) E. (e) a 3. Rank in order, from the most to the least, the number of significant figures in the following numbers. i 52.0 ii. 0.0052 iii. 1.0052iv. 4.321x10 A. ii - i >ivi B. i> i i > iv iii >iviii D. iv> iii > E. i = iv> iiii 8. Which of the following expressions is equal to angle p that specifies the direction of Cas shown in the figure? (Assume the angle is positive tan'(C, CD C. tandC|M (CD 4. The figure at right shows the position-versus-time graph for a moving object. Which is the correct set of lettered points that answers the following three questions sequentially? i. The object is slowing down at ii. The object is moving the fastest at ii. The x-component of the acceleration is negative at A. E, D, B D. D, B, E B. C, B, E E. E, F, D C. D, F, C 9. If each of the two (x and y) components of a vector are divided by - 2, A. the vector's magnitude is halved, but the direction remains unchanged BJ the vector's magnitude is halved and the direction is rotated by 180 C. the vector's magnitude remains unchanged, but the direction angle is halved D. both the vector's magnitude and the direction angle are halved E. neither the direction nor the magnitude of the vector changes. 5. Rank in order, from most positive to least positive, the displacements as between points A to D. A. (Asc >(Asco (AsAB B. (As) (As)AB >(As)ed C. (AscD>(As)Be >(AsAB D. (As)AB (As)be >(As. E. (As)AB>(AscD>(As)pc 10. Let A=2mi+ (6mj-($m)k and B = (-4m) - (2mj-(m) k The vector difference S-B-A is A. (2m-4mj+(4mk BA-bmi-(8mj+2mk C. 6m)i(8m)j-2mk (-2m)+(m)j–(4m)k E. none of theseExplanation / Answer
1] C is correct,
the acceleration is always in downward direction whether the ball has reached its maximum height or not, because the gravity is in downward direction.
2] D is correct,
we can see y<0 for the motion as the position for most of the time is below y=0.
Velocity is in +y direction so vy >0
since it is slowing down, ay <0
3] option C is correct.
iii has 5 , iv has 4, i has 3 and ii has 2 significant figures
4] option A is correct.
the magnitude of slope i.e. the speed is maximum at D, the slope is decreasing at E, acceleration is negative at B because slope is decreasing.