Question

1. Multiply the following and round your answer to the appropriate number of significant figures.                ...

1. Multiply the following and round your answer to the appropriate number of significant figures.

                (3875.20) (0.102)

2. Add the following and round your answer to the appropriate number of significant figures.

                (3005.20) + (7.1225)

3. A ball is thrown straight up, reaches a maximum height, then falls to its initial height. As the ball is going up:

                a. its velocity points upward and its acceleration points downward.

                b. its velocity points downward and its acceleration points upward.

                c. both its velocity and its acceleration points downward.

                d. both its velocity and its acceleration point upward.

4. When an object is released from rest and falls in the absence of friction, which of the following is true concerning its motion?                               

                a. its velocity is constant.

b. its acceleration is constant.                                                                                                                                                     

                c. Both its acceleration and its velocity are constant.

                d. Neither its acceleration nor its velocity is constant.

               

5. A projectile is fired with an initial speed of 50 m/sec at an angle of 30o above the horizontal on a long, flat firing range. Determine the maximum height reached by the projectile.

6. An object’s velocity is given by v(t) = (2 + 1.5t3) i + (3 - 2 t2 ) j where v is in m/sec. Find the position and acceleration of the object at 3 seconds (the object starts at x = 0 when t = 0). Leave your answers in vector form (you’ll still have i and j ).               

7. A ball is thrown horizontally from the roof of a building 9 m tall and lands 12 m from the base. What was the ball’s initial speed?

9. A rock is thrown at a window that is located 18.0 m above the ground. The rock is thrown at an angle of 40.0° above horizontal. The rock is released from a height of 2.00 m above the ground with a speed of 30.0 m/s. If the rock strikes the window on its upward trajectory (meaning that it is still moving upward), from what horizontal distance from the window was it released?

10. A man stands on the roof of a 40 m tall building and throws a rock with an initial velocity of 25 m/sec at an angle of 30o above the horizontal. Find the velocity (magnitude and direction) of the rock when it hits the ground below.

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Answer #1

» (3875-20) (0-10L) = 395.2704 » 1395.21 (3005-20) + (7.1225) 3012.322 3012.32 > Option (A) is correct. As the ball is thrown

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