A: 1.53 m
B: 22.9 m
C: 6.50 m
D: 11.5 m
举一反三
- A rock is thrown straight up with an initial velocity of 15.0 m/s. Ignore energy lost to air friction. How high will the rock rise? A: 1.53 m B: 22.9 m C: 6.50 m D: 11.5 m E: 13.5 m F: 15.7 m G: 21.5 m H: 17.5 m
- 9.3 Air is approaching a converging-diverging nozzle with a low velocity at 20 °C and 85 kPa, and it leaves the nozzle at a supersonic velocity. The velocity of air at the throat of the nozzle is A: 82 m/s B: 98 m/s C: 313 m/s D: 343 m/s
- 在句子I’m your rock中， rock 的意思是 _____ 。
- 地表波在石油中传播速度为（）M/S至（）M/S；在石灰岩中传播速度为（）M/S至（）M/S.
- A 20-g bullet moving at 1 000 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s. If the block had been originally at rest and is free to move, what is its resulting speed? A: 9 m/s B: 18 m/s C: 90 m/s D: 900 m/s E: 60 m/s F: 600 m/s
内容
- 0
A compressible fluid is flowing through a pipe with a constriction. The diameter of the narrow section is 1/2 the diameter of the wide section. The density of the fluid in the narrow section is 3/4 the density of the fluid in the wide section. If the velocity of the compressible fluid is 3.600 m/s in the narrow section, then what is the velocity of the fluid in the wide section? A: 0.675 m/s B: 0.805 m/s C: 0.250 m/s D: 0.333 m/s E: 0.500 m/s
- 1
标准状态下，稳定单质C（石墨）的（）为零。 A: △fHΘm、SΘm B: △fHΘm、△fGΘm、SΘm C: SΘm D: △fGΘm、△fHΘm
- 2
管子中流体和气体的流速一般不超过（ ）。 A: 5 m/s，50 m/s B: 3 m/s，30 m/s C: 3 m/s，100 m/s D: 10 m/s，100 m/s
- 3
空气中的声速大约是:( ) A: 300 m/s B: 1500 m/s C: 1570 m/s D: 5000 m/s E: 8000 m/s
- 4
以下关于strftime()时间格式化：“年月日时分秒”模板字符串的说法正确的是 A: Y%m%d% H%M%S% B: Y%M%D%h%m%s% C: Y%m%d% H%m%s% D: Y%m%d% h%m%s%