Two identical spaceships are traveling in deep space, far from any planets or st

Question

Two identical spaceships are traveling in deep space, far from any planets or stars. The ships travel in the same direction, with the slower one directly behind the faster one. The ships are connected by a cable attached to a spool, so that the part of the cable outside the ships can be made longer or shorter as needed. The cable is used to bring the ships to the same speed for a transfer of cargo. The graph above shows the speed of the two ships during a 10 s interval.

The answer for 35 is B, I want to know why it is B, but not A.

The answer for 36 is C. Could you please explain why. Thx!!!!

Questions 35-36 refer to the following material. 35. Does at least one of the ships have its engine turned on during the time interval shown, and what evidence indicates so? (A) Yes, because Ship 2 is speeding up 3 8005 8000 7995 7990 (B) Yes, because the momentum of the (C) Yes, because an engine is needed to keep (D) No, because the cable alone could be two-rocket system increases the system moving responsible for making Ship 1 slow down Ship o Ship 2 0 2 4 6 8 10 and Ship 2 speed up Time (s) 36. Which of the following graphs best represents the Two identical spaceships are traveling in deep space, far from any planets or stars. The ships travel in the same direction, with the slower one directly behind the faster one. The ships are connected by a cable attached to a spool, so that the part of the cable outside the ships can be made longer or shorter as needed. The cable is used to bring the ships to the same speed for a transfer of cargo. The graph above shows the speed of the two ships during a 10 s interval net force Fnet exerted on the two-ship system? (A) Fre! (N) Time (s) 0 2 4 6 8 10 (B) Ft N) Time (s) 0 24 6 8 10 (C) F (N) Time (s) 0 2 46 8 10 (D) Fnet (N) Time (s) 0 24 68 10

Explanation / Answer

35.see if the momentum is conserved then there is no external force. interchange of momentum between two can increase the velocity of one and decrease of the other.It does not mean that one of the engines is turned on. But if the net momentum changes then the external force should be there.so at least one of the engines is active.so the answer is b.

36. If you see the problem from the center of mass frame you can easily realize that the net velocity obey a straight line with certain slope.it will make an angle with the time axis.so to find the net force you hav to differentiate with respect to the time which will give a constant value.so the answer ia c.

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