2019ROUND1BPHO真题分享 多练习真题才能找到答题秘诀

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.

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BPhO物理竞赛公式分享 想拿奖这些常数和竞赛要记牢

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

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