1. P221 Lecture 6
Does the answer to either a or b depend on the angle with respect to the ground at which the ball is thrown?
( A: Correct: 26 Wrong: 7 Confused: 3 No Answer: 18
B: Correct: 30 Wrong: 0 Confused: 0 No Answer: 15
C: Correct: 25 Wrong: 6 Confused: 1 No Answer: 15)‏
C) If the ball was thrown in any direction other than straight up, there would be two accelerations, one in the down direction and the other in the lateral direction the ball was thrown.
Yes, the answer to b does depend on the angle with respect to the ground at which the ball is thrown. This is due to the fact that the velocities of the ball across the path vary. Thus, one must consider the components to determine the actual acceleration just before it hits the ground.
C) Both a and b depend on the angle with respect to the ground the ball was thrown because it will change the direction and the magnitude of the acceleration.
… emm NO !!!!

2. Examples– Chpt. 4
What is the position of the purse (with respect to the coordinate system
Center on the axis of rotation and oriented as that used for the acceleration)‏
at that same instant in time?

3. A cat jumps over a fence by just clearing its 1. 3 m height
A cat jumps over a fence by just clearing its 1.3 m height. Assuming that the ground on either side of the fence is horizontal, and that you can neglect such details as a change in the cat's configuration during the jump (i.e. it is a "point" cat), which of the following can you determine from this information alone. Please provide a numerical answer where possible, and indicate one additional piece of information you would need to compute the quantity if you have insufficient information.
A) take-off speed . B) time in the air. C) distance between launch and touch-down points.
( A: Correct: 22 Wrong: 11 Confused: 0 No Answer: 21
B: Correct: 7 Wrong: 26 Confused: 0 No Answer: 21
C: Correct: 26 Wrong: 7 Confused: 0 No Answer: 21)‏
A) Would need either acceleration or time it took to clear the fence B) Would need initial velocity and or acceleration C) Would need either velocity or time or acceleration
a) need initial velocity (Vo) b) need starting point (Xo) c) need starting point (Xo)‏
A) Using Vy2=Voy2-2g(Y-Yo), I plugged zero into Vy2, and 1.3 into (Y-Yo) to solve for Voy2. Voy = 5.05 m/s.!

4. CAT question continued:
A). You cannot say, without knowing initial speed, initial position with respect to the fence, OR the take-off angle (but any one of these would be enough to answer it).
B). You can say a lot about the vertical motion alone. Half the time is spent returning to earth from a height of 1.3 m with vo=0, => t=2*(2.6m/9.8m/s2)1/2
C). Here again you need to know the initial speed, position, or the take-off angle

5. Chapter 4 examples

6. Chapter 5 examples

7. Chapter 5 examples (CALM)
Very few individual questions got more than one vote, but 5 or more requested
an example similar to 5-59 (involving an incline and/or multiple blocks linked by
a cord.

8. Chapter 5 examples

9. Chapter 4 examples
SKIP FOR NOW!!!