gc physics textbook chapter 4 problems (id: d8e189746)

本题目来源于试卷: gc physics textbook chapter 4 problems，类别为 IB物理学

[填空题]
A new high-speed 12-cjtzppz2b(b(* e3wg b *dj9z0 har Italian train has a mass7o (0kf:tv2 qj8z tylr of 660 metric tons (660,000 $\mathrm{~kg}$) . It can exert a maximum force of 400 kN horizontally against the tracks, whereas at maximum velocity ( 300 $\mathrm{~km} / \mathrm{h}$) , it exerts a force of about 150 kN . Calculate (a) its maximum acceleration   
(b) estimate the force of air resistance at top speed.   

参考答案:
空格1: 0.61±2%  空格2: 15000±2% 


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