Chapter 8 - Worked Solutions

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

(a) zero

(b) p_neutrino = 2 x 10^-20 kg ms^-1; p_electron = 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
 

p_arrow = 0.1 x 50 = 5 kg ms^-1
p_up = 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°
 

p_A = 0.4 x 10 = 4 kg ms^-1
p_A' = 0.4 x 8 = 3.2 kg ms^-1
p_B' = 0.650 v_B




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

v_B = 2.3/0.65 = 3.5 ms^-1
q = tan^-1 RS/PR =38° (S38° E)
 

p (exhaust) - mv = 500 x 10 x 5 x 10⁴ = 2.5 x 10⁸ kg ms^-1
p_i = p_f
25000 x 1 x 10³ = mv + (-2.5 x 10⁸)
2.5 x 10⁷ = 20000v + -2.5 x 10⁸
v = 13750 ms^-1
 

Return to Physics Text Home Page