Chapter 8 - Worked Solutions

to selected extension questions from the OUP text Senior Physics - Concepts in Context by Walding, Rapkins and Rossiter

Question 34


(a) zero

(b) pneutrino = 2 x 10-20 kg ms-1; pelectron = 6 x 10-21 kg ms-1

 = 2.09 x 10-20 kg ms-1

(c) v = p/m = 2.09 x 10-20/ 3.905 x 10-25 = 53470 ms-1
 
Question 35



parrow = 0.1 x 50 = 5 kg ms-1
pup = 0.050 x 20 = 1 kg ms-1

= 5.1 kg ms-1
v = p/m = 5.1/0.150 = 34 ms-1; q = 11.3
 
Question 36


pA = 0.4 x 10 = 4 kg ms-1
pA' = 0.4 x 8 = 3.2 kg ms-1
pB' = 0.650 vB




QR = 3.2 cos35° = 2.6
RS = 4 - 2.6 = 1.4
PR = 3.2 sin35° = 1.8

vB = 2.3/0.65 = 3.5 ms-1
q = tan-1 RS/PR =38° (S38° E)
 
Question 37
p (exhaust) - mv = 500 x 10 x 5 x 104 = 2.5 x 108 kg ms-1
pi = pf
25000 x 1 x 103 = mv + (-2.5 x 108)
2.5 x 107 = 20000v + -2.5 x 108
v = 13750 ms-1
 
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