EBK PHYSICS FOR SCIENTISTS AND ENGINEER
6th Edition
ISBN: 9781319321710
Author: Mosca
Publisher: VST
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Chapter 8, Problem 95P
(a)
To determine
The thrust of the rocket.
(b)
To determine
The time until burn out.
(c)
To determine
The speed of rocket at burn out.
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A rocket has a total mass of 1.00 x 105 kg and a burnout mass of 1.00 x 104 kg, including engines, shell, and payload. The rocket blasts off from Earth and exhausts all its fuel in 4.00 min, burning the fuel at a steady rate with an exhaust velocity of ve = 4.50 x 103 m/s. (a) If air friction and gravity are neglected, what is the speed of the rocket at burnout? (b) What thrust does the engine develop at liftoff? (c) What is the initial acceleration of the rocket if gravity is not neglected? (d) Estimate the speed at burnout if gravity isn’t neglected.
If a rocket engine ejects gases at a rate of 29 kg/s, how fast must the gaseous exhaust be moving if the thrust produced is sufficient to allow a 2.7 x 105 kg rocket to rise slowly from the earth when aimed straight up? Express your answer in km/s.
A rocket has a total mass of 1.17 105 kg and a burnout mass of 1.03 104 kg, including engines, shell and payload. The rocket blasts off from Earth and exhausts all its fuel in 4.17 min, burning the fuel at a steady rate with an exhaust velocity of ve= 4.89 103 m/s.
(a) If air friction and gravity are neglected, what is the speed of the rocket at burnout?
(b) What thrust does the engine develop at liftoff?
(c) What is the initial acceleration of the rocket if gravity is not neglected?
Chapter 8 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
Ch. 8 - Prob. 1PCh. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Prob. 5PCh. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Prob. 8PCh. 8 - Prob. 9PCh. 8 - Prob. 10P
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