Correct! Question 1 11/11 pts A rocket engine burns 8.5 kg of fuel and oxidizer per second. the combustion gases exit at a velocity of 565 m/s relative to the rocket to the atmosphere. What is the thrust? 4800 N 2400 N 8.5 N 565 N Correct! Question 2 11/11 pts A rocket ship is moving at 9000 m/s in deep space so we can neglect gravity.. A retro rocket burns 7 kg/s and exhausts at 1500 m/s relative to the rocket. the initial mass of teh rocket is 1600 kg, and we wish to slow the ship from 9000 to 8900 m/s. How long should we fire the retrorocket? Treat the mass as a variable- so you will have a differential equation from F = ma. separate the variables to integrate. 14.7 s 16s 20s 30 s Question 3 11/11 pts Water has a density of 1000 kg/m. Imagine a vertical pipe of height 6 meters with the top open to atmosphere. The pipe diameter is 4 cm. If the fluid is NOT moving, what is the gage pressure at the bottom of the pipe? Pascals Correct! 58800 Pa 29000 Pa 6000 Pa 15000 Pa Correct! Question 4 11 / 11 pts Water has a density of 1000 kg/m. Imagine a vertical pipe of height 6 meters with the top open to atmosphere. The pipe diameter is 4 cm. If the fluid is moving with a velocity of 5 m/s, what is the gage pressure at the bottom of the pipe? Pascals Neglect friction 58800 Pa 29000 Pa 6000 Pa 15000 Pa Correct! Question 5 P = 150,000 Pa V = 5.0 m/s h=0.0m A g=1000 kg/m g=9.8 m/s2 V2= 10 m/s h=2.0m 11/11 pts Study.com Diameter at 1 = 2 cm. P1 = 15 kPa gage z =0 At the exit P2=?v= 10 m/s and z = 2 meters.. P1 is a gage pressure; find P2. The next question will ask for the horizontal force (Newtons) exerted on the pipe bend. -42000 Pa 42000 Pa 28000 Pa -5000 Pa Correct! Question 6 11/11 pts Use Q5 to find the horizonal force on the pipe bend. (place the negative pressure on your diagram in usual way== just watch the sign) 3.4 N 19.2 N 9.8 N 6.6 N Question 7 11/11 pts In a horizontal pipe with diameter of 5 cm, water flows with a volumetric flowrate of .01 m/s. The inlet pressure is 100 kPa gage before it flows through a pump. The exit pressure is 200 kPa gage. What is the pump head in meters? Correct! 10.2 m 5 m 0.1 m 25 m Correct! Question 8 11/11 pts In a horizontal pipe with diameter of 5 cm, water flows with a volumetric flowrate of .01 m/s. The inlet pressure is 100 kPa gage before it flows through a pump. The exit pressure is 200 kPa gage. What is the pump power in kw? 1 kW 0.1 kW 0.01 kW 10 kW Correct! Question 9 Water: 1000 kg/m 1 D = 10 cm 12/12 pts | Pa = 0 (gage) 2 D = 3 cm CV The nozzle of fire hose is enclosed in a dashed rectangle labeled as CV (Control Volume, principle of momentum conservation applies at this system). A 10 cm firehose discharges water at 1.5 cubic meters/min. Neglecting friction find the force through the flange bolts. 4071 N 2000 N 4800 N 1000 N