本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum,类别为 IB物理学
[单选题]
A jet of water with a * ax(w6/:)vesb upbyfrqt;d/ cross sectionnx w9/(g tgtcjk1h: iin2 l5/dal area of A strikes perpendicular to a wall at a speed of v After the collision, the water loses all of its horizontal speed and falls to the ground. The magnitude of the force created on the wall due to the water is F Which expression give the density jgwn/i kn2 9 x:tt1( c5h/ilgdof the water?
A. $\frac{F}{Av^2}$
B. $\frac{F}{Av}$
C. FAv
D. $FAv^2$
参考答案: A
本题详细解析:
xplanation: Considering the mass of water that strikes the wall in 1 second: where ρ is the density of the water and V is the volume of the water. Assigning the length of the column of water to be l But l=vt and t=1, therefore l =v Giving After the impact, the horizontal velocity of the jet is zero. Rearranging gives
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