Momenis of nertar hop:dsk 1-M sold gphohereR 50 solid sphere: 1 MR hollow sphere

Question

Momenis of nertar hop:dsk 1-M sold gphohereR 50 solid sphere: 1 MR hollow sphere I MR Conversions: 1.0 kg 2.2 lbs ft 0.3048 m 1 in 2.54 crm 12. Boy pulls a box with mass m -10.2 kg across a yard, exerting a force of F - 75.4 N at an angle 0-39.59 as shown much work does he do in moving 37m? FdCOSO :75437Cs.S 203 Lo23 W: us.21J 53.18(3.1) 11 7.9 47.43. 5.21 b) If he moves at a constant speed, what can you say about the magnitude of the work done by resistive forces? i) It is greater than the work done by the man and has the same sign. ii) It is greater than the work done by the man and has the opposite sign iii) It is less than the work done by the man and has the same sign. iv) It is less than the work done by the man and has the opposite sign. v) It is equal to the work done by the man and has the same sign. It is equal to the work done by the man and has the opposite sign. 13. An unfortunate astronaut is floating at rest next to her space station. In order get back to the station and avoid dying in space, she throws her bag of tools with a velocity of 25.0 m/s (relative to the space station). (a) Draw a good well-labeled diagram of this. (b) If the astronaut's mass is 135 kg and the bag of tools is 9.0 kg, what is her final velocity? (12)

Explanation / Answer

b )  The astronaut needs to reduce his velocity (and hence momentum) to zero to stop moving away from station.
Using conservation of momentum,
momentum before = (135 + 9)*25 = 3600mkg/s
momentum after = (135*0+ 9.0*v) = 9.0v
3600 = 9.0v
v = 400 m/s

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