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2015CAP Prize Exam加拿大高中物理大獎(jiǎng)賽真題答案下載

Category: 國(guó)際競(jìng)賽, 福利干貨, 競(jìng)賽資料 Date: 2018年8月27日下午12:32

歷年CAP High School Prize Exam加拿大高中物理大獎(jiǎng)賽

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CAP Prize Exam加拿大物理奧林匹克學(xué)術(shù)活動(dòng)

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2015 CAP Prize Exam完整版真題免費(fèi)下載

共計(jì)3小時(shí)考試時(shí)間

此套試卷由25道選擇題以及3道大題組成

每道大題含有不同數(shù)量的小題

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2015 CAP Prize Exam完整版真題

2015CAP Prize Exam加拿大物理奧林匹克完整版答案免費(fèi)下載

部分真題答案預(yù)覽：

Part A選擇題部分：

Part B簡(jiǎn)答題部分

Solution to Problem 1：

From the red dashed red triangle on the picture one can measure the shooting angle to be θ = (22 ± 3?). Using the scale of the graph and attached to the exam “ruler” one can measure the maximum height above the end of the shooter h =( 9 ± 2) m and the horizontal distance from the end of the shooter to the place of maximum height L = (33 ± 2) m as well as the height H = 35m from the maximum to the drop point and total range? L’ = (83 ± 2) m

From the conservation of energy we have:

mgh + m(vcosθ)2/2 =? mv2/2

v = √2gh/(1-cosθ)2 = ?√2gh/sinθ2 = 35 ± 8 m/s

Horizontal speed is vh= v cosθ = 32 m/s and it should be constant without air resistance. Due to acceleration g it should take t1 =√2h/g = 1.3??? to reach height h and? t2 = √2H/g??? = 2.7 s to drop to the bottom.? During this time gravel should cover a distance of about 140 m. The observed range is much smaller (83 m) due to the air resistance.
The average horizontal speed is about

va = 83/4 = 21 m/s.

The final speed is:

va = (vh+vf)/2? vf = 2va? - vh? = 7 m/s

so the negative acceleration due to air resistance is

vf = vh – at??? a = (vh – vf)/t = 6m/s2

So the force acting on (for example) 1 kg of gravel was about 10 N. It is clear from the photograph that it strongly depend on the size of stones.

There were many ways to solve this problem and all the fully correct ones were awarded full marks and partly correct ones part marks.? ?

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