19. A spacecraft, traveling in deep space, fires thrusters to achieve a change in speed of 2.8 km/s. If the specific impulse of the thrusters is 300 s, what is the ratio of the initial spacecraft mass to the spacecraft mass after the thrusters have fired? a. 0.9 3003 /2.84 2.6 8.2 c. d. None of the above

19. A spacecraft, traveling in deep space, fires thrusters to achieve a change in speed of 2.8 km/s. If the specific impulse of the thrusters is 300 s, what is the ratio of the initial spacecraft mass to the spacecraft mass after the thrusters have fired? a. 0.9 3003 /2.84 2.6 8.2 c. d. None of the above

Automotive Technology: A Systems Approach (MindTap Course List)

6th Edition

ISBN:9781133612315

Author:Jack Erjavec, Rob Thompson

Publisher:Jack Erjavec, Rob Thompson

Chapter3: Basic Theories And Math

Section: Chapter Questions

Problem 2RQ: In what four states does matter exist? Cite examples of each.

See similar textbooks

Similar questions

The following data are given for a certain rocket unit: Thrust, 8000 N Propellant weight flow rate, 36 N/sec Speed of rocket, 800 m/s internal efficiency32%combustion efficiency 97 % Determine (a) the effective velocity; (b) total kinetic energy per second (c) calorific value of propellant (d) the propulsive efficiency (e) the overall efficiency (f) the specific impulse (g) the specific propellant consumption ????? =1/3 ?(?^2) hV cylinder = ?(?^2) h V frustrum = 1/3 ?ℎ(?^2 +?^2 +? ×?)
1, A small ball, mass = 0.60 kg, at the end of a string is whirled in a vertical circle of radius = 60 cm with a tangential velocity of 8.0 m/s. (a) What is the tension in the string when it is at the bottom of the circle? (b) What is the tension in the string when it is at the top of the circle? (c) What is the critical velocity? 2, A cement truck, mass = 2000 kg, has an engine which produces 4000 N. The truck develops a leak and loses cement at a rate of 10 kg/sec, (a) The truck starts from rest and accelerates when the light turns green. What is its initial acceleration? (b) What is the equation for the acceleration as a function of time? (c) What is the equation for the velocity as a function of time? (d) How long will it take the cement truck to get up to a velocity of 15 m/s?
Assume 2.5 lb/sec of fluid enter a steady-state, steady-flow system with P₁ = 93.98 psia, ρ₁ = 0.349 lb/ft³, v₁=98.93 fps, u₁ = 795.84 BTU/lb, and leave with P₂ = 27.58 psia, ρ₂ = 0.184 lb/ft³, v₂ = 473.25 fps, and u₂ = 761.82 BTU/lb. During the passage through the open system, each pound rejects 14.8 BTU of heat. Determine the work in hp.
Liquid octane enters an internal combustion engine operating at steady state with a mass flow rate of 0.004 lb/sand is mixed with the theoretical amount of air. The rate of heat transfer is 22.22 BTU/s. If the density of octane is 5.88 lb/gal, how many gallons of fuel would be used in 2 h of continuous operation of the engine?
Assume 2.5 kg/s of fluid enter a steady-state, steady-flow system with pressure p1 = 700 kPaa, density ρ1 = 3.2 kg/m3, velocity v1 = 30 m/s, specific internal energy u1 = 1 856.8 kJ/kg, and leave with p2 = 138 kPaa, ρ2 = 0.81 kg/m3, v2 = 150 m/s and u2 = 1 810.4 kJ/kg. During passage through the open system, each kilogram rejects 23.2 kJ of heat. Find the power in kW. (whole number)
Assume 2.5 kg/s of fluid enter a steady-state, steady-flow system with pressure p1 = 700 kPaa, density ρ1 = 3.2 kg/m3, velocity v1 = 30 m/s, specific internal energy u1 = 1 856.8 kJ/kg, and leave with p2 = 138 kPaa, ρ2 = 0.81 kg/m3, v2 = 150 m/s and u2 = 1 810.4 kJ/kg. During passage through the open system, each kilogram rejects 23.2 kJ of heat. Find the power in kW.
5. In a simple impulse stage steam enters a simple impulse bucket wheel with anabsolute velocity of 450 m/sec and a relative velocity of 270 m/sec. It leaves the blades with a relative velocity of 230 m/sec and an absolute velocity of 105 m/sec. Find the available energy, KJ/kgA. 111.25 B. 101.25 C. 131.25 D. 161.25
an automobile uses 80.5 kw to maintain a uniform speed of 90 kph. what is the trust force provided by the engine?
The following are reasons why we use assumptions to represent reciprocating engines as closed system cycles, EXCEPT: a.All statementds are valid b.Reciprocating engines have equivalent thermal efficiencies as their corresponding cycles c.The shape and behavior of reciprocating engines are too complex d.The working fluid for reciprocating engines is an air-fuel mixture, which could be difficult to model
QUESTION 1 In the process of taking a gas from state 'a' to state c along the curved path shown in the image. 85J of heat leaves the system and 55J of work is done on the system. a) determine the change in internal energy, Ea-Ec. b) when the gas is taken along the path cda, the work done by the gas is W=38J. How much heat Q is added to the gas in the process cda? c) if Pa= 2.2Pd, how much work is done by the gas in the process abc?. d) what osvQ for path abc? e) if Ea-Eb=15J, what is Q for the process bc? QUESTION 2 suppose a gas is taken clockwise around the rectangular cycle shown in the image. Starting at b, then to a, to d, to c and returning to b. Using the values given in question 1 above a) describe each leg of the process and then calculate b) the net work during the cycle and d) the net heat during the cycle. e) what percentage of intake heat has turned into usable work i.e how efficient is this "rectangular" cycle ( give as a percentage)
a SSSF control volume has three inflow streams, where each inflow stream has a mass-flow-rate, m(dot) = 2kg/sec. In addition, there are two outflow streams, where one of these outflow streams has a mass-flow-rate, m(dot) = 5 kg/sec. What is the mass flow rate of the second outflow stream in kg/sec?
The figure below shows a turbine-driven pump that provides water to a mixing chamber located dz⁢= 5 m higher than the pump, where m˙=50 kg/s. Steady-state operating data for the turbine and pump are labeled on the figure. Heat transfer from the water to its surroundings occurs at a rate of 2 kW. For the turbine, heat transfer with the surroundings and potential energy effects are negligible. Kinetic energy effects at all numbered states can be ignored. Determine:(a) the magnitude of the pump power, in kW.(b) the mass flow rate of steam, in kg/s, that flows through the turbine.