上半年的BPHO真题马上就要到了，本期特地给大家带来了几道2019年的BPHO真题，这些真题都是出现在了round1中，大家一起来看看能不能做出来！
a) A golf ball is struck and begins to move at an initial velocity of 60 m（-1）at an angle 40（。）?above the horizontal. Determine at time t = 3 s after the strike
(i) the velocity of the ball, and
(ii) the position of the ball relative to the origin.
b) A drone flies horizontally. The displacement of the drone is given by s = 2t?i + 6t?j,where ?i and ?j are unit vectors to the East and North respectively. Determine at t = 2 s:
(i) the speed of the drone,
(ii) its bearing in degrees,
(iii) its acceleration.
Note: all bearings are measured clockwise from North.
c) Estimate the mass of a piece of paper the size of a pinhead (the blunt end of a sewingpin). Show your calculation.
d) The speed of surface waves of wavelength λ on a liquid of density ρ is given by
where a and b are constants. Determine the units of a and b.
因为篇幅有限BPHO真题只给大家分享到这里了，如果你想竞赛复习、学习两不误，短时间高效出分，点击预约试听【竞赛复习班】，海归一线竞赛坐镇，优质教案研发，复习效果显著，不浪费每个学员的竞赛复习时间——
点击
BPhO物理竞赛考试日期倒计时开启了 快来了解考试详情成为竞赛黑马
查看。
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