问题 问答题

2012年6月15日,我国的“蛟龙”号载人潜水艇,在太平洋马里亚纳海沟区域进行的7000m级海试第一次下潜试验中,突破了6500m深度,创造了中国载人深潜新纪录.(g取10N/kg,海水密度p近似取1.0×103Kg/m3,忽略海水密度的变化)

(1)当潜水器排开海水的体积为10m3时,受到的浮力是多大?

(2)若潜水器到达6500m深的海底世界时,海水对它外壳的压强约是多大?如果潜水器的一个观测孔的面积约为3×10-2m2,则海水对该观测孔的压力约是多大?

答案

(1)∵潜水器排开海水的体积为10m3

∴潜水艇受到的浮力:

FgV=1.0×103kg/m3×10N/kg×10m3=1.0×105N

答:当潜水器排开海水的体积为10m3时,受到的浮力是1.0×105N.

(2)海水对潜水艇外壳的压强:

P=ρgh=1.0×103kg/m3×10N/kg×6500m=6.5×107Pa,

海水对该观测孔的压力:

F=PS=6.5×107Pa×3×10-2m2=1.95×106N

答:若潜水器到达6500m深的海底世界时,海水对它外壳的压强约是6.5×107Pa,海水对观测孔的压力约是1.95×106N.

单项选择题

(B)

Disney’s cartoon, Finding Nemo, tells a touching story of a father called Martin and his son Nemo.

Martin loses his wife and an entire family of unhatched eggs to a huge shark. Only one fish egg remains, Nemo. Martin promises his dead wife that he will protect his young son at any cost. So, Martin becomes fearful of almost everything in the ocean. That makes him over protective-he hopes to keep his kid safe from the challenges that life presents. Martin’s nagging (唠叨) makes Nemo feel that he doesn’t need his dad telling him what to do.

So on his first day of school, Nemo and some friends swim to the edge of their coral reef, a place Martin always thinks is very dangerous. When Martin shouts at Nemo come back, Nemo refuses to listen to him and swim out to a boat in the distance. Suddenly, he gets caught by some divers. So begins Martin’s journey to find Nemo, who ends up in an aquarium in an office in Australia. Soon the worried father runs into Dory, a forgetful blue fish, who helps Martin find his son. Meanwhile, Nemo misses his father terribly. He soon hears that he will be given to an eight-yearold girl who likes to kill fish.

Can Martin find his son before it is too late

Finding Nemo is a physical and mental journey. Martin overcomes his shyness and anxieties and Nemo discovers his own and his father’s hidden strengths. It celebrates the relationship between fathers and their sons.

The cartoon paints a sea world that is alive with color. All the characters are very human-like and have their own personalities.

Finding Nemo was released in the US on may 30, earning about US $70.6 million in just three days, it has set a new opening records for a cartoon.

What is the passage mainly about()

A. How a father finds his son.

B. How to get home when getting lost.

C. A brief introduction to a cartoon film.

D. The love between a father and his son.

问答题 简答题