Multiple Choice In all question and problems, ignore air resistance. Use g = 9.8

Question

Multiple Choice In all question and problems, ignore air resistance. Use g = 9.80m / s2. The x-component of the vector shown at right is Fx = F cos 25 degree Fx = -F cos 25 degree Fx = -F sin 25 degree Fx = -F sin 25 degree when is the mechanical energy (K + U) of a system conserve? It is always conserved. It is never conserved. only when the net external force is zero. Only if non-conservative forces do no work When is the total linear momentum of a system conserve? It is always conserved. It is never conserved. only when the net external force is zero. Only if non-conservative forces do no work When is the time rate of change of linear momentum of particle equal to the net force acting on the particle? It is always true. It is never true. only when the net external force is zero. Only if non-conservative forces do no work A baseball is batted straight up. While it is rising, its velocity points _. and its acceleration poin upward / upward upward / downward downward / upward downward / downward A baseball is batted straight up. At the very top of its trajectory both the velocity and acceleration are zero. the velocity and acceleration are zero and the acceleration points downward. the velocity is zero and the acceleration points upward. The velocity points upward, but the acceleration is zero. A physics text has just been thrown out a window of Koch Center. Which of the diagrams below best represents the individual force(s) acting on the book while it is in mid-air?

Explanation / Answer

1) D

2) D

3) C

4) A

5) B

6) B

7) C

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