PHYSICS-3945-Information

As far as maintenance costs are concerned: O for high levels of maintenance commitment, breakdown maintenance costs exceed preventive maintenance costs. O for low levels of maintenance commitment, preventive maintenance costs exceed breakdown maintenance costs. preventive maintenance is always more economical than breakdown maintenance. breakdown maintenance is always more economical than preventive maintenance when the "full cost of breakdowns" is taken into consideration. O for low levels of mairtenance commitment, breakdown maintenance costs exceed preventive maintenance costs.

Q\ Which of the following represents the first law of thermodynamics? Possible Answers: a. While melting, an ice cube remains at the same temperature b. The specific heat of an object explains how easily it changes temperatures c. After falling down the hill, a ball's kinetic energy plus heat energy equals the initial potential energy d. Two systems in equilibrium with a third system are in equilibrium with each other e. If a refrigerator is unplugged, eventually everything inside of it will return to room temperature.

COMPLETE SOLUTION PLS 4 DECIMAL PLACES COMPLETE SOLUTION PLS 4 DECIMAL PLACES COMPLETE SOLUTION PLS 4 DECIMAL PLACES

How do you know that S is equal to 4piD?

13. Two objects, A and B, are acted on by the forces shown in the FBDs. Is the magnitude of the net force acting on object B greater than, less than, or equal to the magni- tude of the net force acting on object A? Make a scale drawing on graph paper and explain the result. (d) 459 4N 459 2N 2 NA 45° 4 N 45° 2N 2 N

5. The mission profile for a 4-engine jet aircraft consists of the following segments: engine start and warm-up, taxi, take-off, climb to an altitude of 20000 ft followed by a cruise distance of R₁ nm at 350 kts, climb to an altitude of 35000 ft, followed by a cruise distance of R2 nm at 450 kts descent to 10000ft followed by one hour loiter and flight to an alternate airport at R3 nm distance both at 250 kts, descent to landing approach condition followed by the final landing, taxi and shutdown. The total distance during the cruise segments and flight to an alternate airport is restricted to a maximum of 5100 nm. Based on the existing manufacturers' data you may use the information provided in Table QA-1. L/D cruise at 20000 ft altitude L/D cruise at 35000 ft altitude 18 20 L/D at 10000 ft altitude (loiter and flight to an alternate airport) C;: Specific Fuel Consumption at cruise segments C;: Specific Fuel Consumption during loiter and flight to an alternate airport Weight ratios…

The shape of a discus aids the thrower by facilitating   Question 6 options:   aerodynamic friction and stability from angular momentum   aerodynamic lift and stability from angular momentum   aerodynamic lift and stability from linear momentum   aerodynamic friction and stability from Linear momentum

Choose the best answer and explain it An engineer wants to design an improved elevator for a building. The original design used a motor that could lift 1000 kg through a distance of 20 meters in 30 seconds. The engineer wants a motor that can lift 800 kg through a distance of 30 meters in 20 seconds. Compared to the old motor, the new motor __________. Explain your answer.    (A) Should exert a force of the same magnitude, but must provide larger power output    (B) Should exert a force of a larger magnitude, and must provide a larger power output          (C) Can exert a force of a smaller magnitude, and can provide a smaller power output      (D) Can exert a force of a smaller magnitude, but must provide the same power output                                      (E) Can exert a force of a smaller magnitude, but must provide a larger power output.

1- First law transient: A water storage tank initially contains 400 m³ of water. The average daily usage is 40 m³. If water is added to the tank at an average rate of 20[exp(-t/20)] m³ per day, where t is time in days, for how many days will the tank contain water? 2- First law steady state: A simple vapor power plant operating at steady state with water circulating through the components is shown. The Pi= 100 bar T; = 520°C Power out Turbine mass flow rate of the water is 109 kg/s. Kinetic and potential energy effects are negligible as are all stray heat transfers. Determine (a) the thermal efficiency, (b) the mass flow rate of the cooling water passing through the condenser, in kg/s. P=0.08 bar Steam X2= 90% +2 Cooling water in at 20°C generator Condenser 4 P= 100 bar T = 43°C Cooling water out at 35°C Pump P=0.08 bar Saturated liquid Power in 3- First law steady state: Steam enters a well-insulated turbine operating at steady state with negligible velocity at 4 MPa, 320°C. The steam…

You drop a rock from a cliff. If air resistance is neglected, which of the following statements is (are) true? The speed of the rock will increase. The speed of the rock will decrease. The acceleration of the rock will increase. The acceleration of the rock will decrease.

O Problem 2 (Exercise 1.8.22a) r------------------ Earlier experiments have shown that a certain component cools in air according to Newton's cooling law with constant of proportionality k = 0.2. At the end of the first processing stage, the temperature of the component is 120 °C. The component remains for 10 min in a large room and then enters the next processing stage. At that time the surface temperature is supposed to be 60 °C. What must the room temperature be for the desired cooling to take place? /

Please match the correct descriptions to the corresponding Thermodynamic laws:                                                  The first law of Thermodynamics is_________                                                  The second law of Thermodynamics is_________                                                  The zero law of Thermodynamics is_________ A. During an interaction, energy can change from one form to another but the total amount of energy remains constant. Energy cannot be created or destroyed. The first law is an expression of the conservation of energy principle. B. If two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. C. It asserts that energy has quality as well as quantity, and actual processes occur in the direction of decreasing quality of energy.