The 4 lb particle is subjected to the action of its weight and forces F1={2i+6j−2tk}lb, F2={t2i−4tj−1k}lb, and F3={−2ti}lb, where t is in seconds. Determine the distance the ball is from the origin 5 s after being released from rest.
(Figure 1).

A tank contains 21 kg of dry air and 0.3 kg of water vapor at 30°C and 100 kPa total pressure. Determine

(a) The specific humidity

(b) The relative humidity

(c) The specific enthalpy of the mixture in the tank as (kJ/kg-mixture) (calculate by hand)

(d) The specific enthalpy of the mixture in the tank as (kJ/kg-dry air) (calculate by hand)

(e) Explain (in 1-2 sentences) the difference between the values in c and d – which value agrees with the enthalpy value in the psychrometric chart at this condition?

A circular loop which possesses 55 turns is placed in a uniform magnetic field. The direction of the magnetic field makes an angle of 70 o with respect to the normal direction to the loop. The magnetic field strength B is increased at a constant rate from B1 =3T to B2 =17T in a time interval of 20 s. If Ф1 is 3.99 Wb,

a) What is the radius of the wire? (PLEASE THOROUGHLY EXPLAIN)

b) What is the EMF?

c) What is the current if the electrical resistance of the loop is 7 ohms?

What you are to do is select a specific material (although the selection does not have to be approved by the Instructor, it cannot be generic [e.g., metal] but instead must be specific [e.g., 6061 aluminium metal alloy or PMMA polymer]). For the material chosen you will need to determine some material specifications, properties, attributes (availability, cost, fabricability, service life, colour, texture, etc.) that make this material unique and interesting to you. Also tell me about some of the applications for this material and why you think the material was chosen for those applications.

What is profitability Index? Given the discount rates and the future cash flows of each project, which project should they accept using Profitability Index?

Air enters the compressor of an air-standard Brayton cycle with a volumetric flow rate of 60 m³/s at 0.8 bar, 280 K. The compressor pressure ratio is 17.5, and the maximum cycle temperature is 1950 K. For the compressor, the isentropic efficiency is 92% and for the turbine the isentropic efficiency is 95%.


Determine:

(a) the net power developed, in kW.

(b) the rate of heat addition in the combustor, in kW.

(c) the percent thermal efficiency of the cycle.

Need some help with those questions. Thank you so much

Manufacturing Technology

1. The effects of cutting fluids on biological considerations and the environment.

2. Find out method in face milling and end milling operation.
(i) procedure
(ii) application

3. Summarize the centerless grinding, cylindral grinding, surface grinding in 4 line.

4. What are the difference on the operation between sensitive drill press and radial drilling machine

CASE STUDY A pilot was taxiing his air-force jet when the ejector seat fired, sending him upwards to then crash down onto the airfield, where he died from the impact injuries. Ejector seats are designed to enable a pilot to escape from a disabled aeroplane. When activated by the pilot (that is the normal way they work) a rocket pushes the seat and pilot out of the aircraft and at the top of the trajectory a parachute deploys to bring the pilot to the ground safely. This seat was not designed to enable a safe ejection at ground level, as the parachute would not have time to deploy before the seat hits the ground. Use the search term “RAF Ejector Seat” to discover a host of web sources for information on this tragic case i. Define the appropriate Event and draw, with the brief written explanation, a Mechanism analysis logic diagram. [25 marks] ii. Determine and explain your choice of the ‘questions’ which you would use to provide structure to the Outcome process and draw an Outcome Analysis diagram for the case based on those questions. [25 marks]

An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27°C, and 900 kJ/kg of heat is transferred to air during the constant-volume heat-addition process. Taking into account the variation of specific heats with temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle

1. How does reliability helps in performance of maintenance function?

T OR F? Sgen is greater than zero for reversible process

COP of a refrigerator is higher than COP of a heat pump operating between the same two reservoirs

The efficiency an irreversible heat engine is always lower than the efficiency of a reversible engine operating between the same two reservoirs.