Free Printable Fluid mechanics

1.

右图显示一水银计压器。问C点的压强是多少？已知大气压强为 75 cmHg 。

Figure shows a mercury barometer. What is the pressure of mercury at point C? Known that atmospheric pressure is .

a)

0 cmHg

b)

10 cmHg

c)

76 cmHg

d)

90 cmHg

2.

A block of aluminium has a density of $2700\ kg\ m^{-3\ }$ and a volume of $500\ cm^3$ . Calculate the apparent weight of the block when it is fully immersed in water.

一铝块的密度为

2700\ kg\ m^{-3}

及体积为

500\ cm^3

。计算该铝块完全浸在水里时的视重量。

a)

4.90 N

b)

8.33 N

c)

13.23 N

d)

18.13 N

3.

布朗让一个体积为 $5000\ cm^3$ 的西瓜浮在水面上，西瓜的 $\frac{2}{5}$ 体积浸在水中。随后可尼取一轻绳绑着西瓜并握着以至只有西瓜的 $\frac{1}{5}$ 体积浸在水里。问轻绳所受的张力是多少？

Brown lets a watermelon with volume of

5000\ cm^3

floats on water.

\frac{2}{5}

of its volume immersed in water. After that, Cony ties a light string to the watermelon and holding it so that only

\frac{1}{5}

of its volume immersed in water. How much is the tension in the string?

a)

9.8 N

b)

19.6 N

c)

29.4 N

d)

49 N

4.

右图所示一本生灯的结构图。B 是控制气孔大小的调节环。C 是让空气进入以达到无光火焰的气孔。问A, B, C 及 D 哪个部位的压强最低？

Figure on the right shows a diagram of a Bunsen burner. B is the ring to control the air hole while C refers to air hole that allows fresh air entering to achieve luminous frame. Which of the regions labeled A, B, C and D has the lowest pressure?

a)

A

b)

B

c)

C

d)

D

5.

If the flowing speed of liquid at larger pipe is $5\ cm\ s^{-1}$ , what is the flowing speed of liquid at smaller pipe?
如果粗水管的流速为 $5\ cm\ s^{-1}$ ，问细水管的流速为多少？

a)

$0.25\ cm\ s^{-1}$

b)

$5\ cm\ s^{-1}$

c)

$50\ cm\ s^{-1}$

d)

$100\ cm\ s^{-1}$

6.

$v_1=5\ cm\ s^{-1},\ v_2=100\ cm\ s^{-1}$

续题5，计算活塞Y 所传递的压强。
Continue from question 5, calculate the pressure transmitted by piston Y.

a)

$9.9\times10^5\ Pa$

b)

$9.95\times10^5\ Pa$

c)

$1.00\times10^5\ Pa$

d)

$1.05\times10^5\ Pa$

Fluid mechanics

Total questions: 6

Worksheet time: 30mins

Similar Resources on Wayground