Draw the functional tree diagram of a hair dryer using its primary function and sub-functions.

A 140litre container is to be used to store heat for a domestic heating system. There are two options for the storage material, lead blocks or clay bricks. Using the data provided determine which is the best option for the system.                                                         

Lead: specific heat 130J/kgK, density 11340kg/m³

Brick: specific heat 840kJ/kgK, density 2000kg/m³

2. A container holds 0.25m³ of compressed air at 900kPa and 20°C. This is expanded polytropically via a process with n=1.3 to a pressure of 150kPa. Determine;         

(2 marks each)

1. The mass of air
2. The final air temperature
3. The work transfer, stating if it is input or output work
4. The change in internal energy
5. The heat transfer , stating if this is heat input or output

please answer both the questions/

Consider a regenerative vapor power cycle with two feedwater heaters, a closed one and an open one, and reheat. Steam enters the first turbine stage at 12 MPa, 560 °C, and expands to 1.5 MPa. Some steam is extracted at 1.5 MPa and fed to the closed feedwater heater. The remainder is reheated at 1.5 MPa to 440 °C and then expands through the second-stage turbine to 0.3 MPa, where an additional amount is extracted and fed into the open feedwater heater operating at 0.3 MPa. The steam expanding through the third-stage turbine exits at the condenser pressure of 10 kPa. Feedwater leaves the closed heater at 220 °C, 10 MPa, and condensate exiting as saturated liquid at 1.5 MPa is trapped into the open feedwater heater. Saturated liquid at 0.3 MPa leaves the open feedwater heater. Assume all pumps and turbine stages operate isentropically. Determine for the cycle:
      a) The rate of heat transfer to the working fluid passing through the steam generator, in kJ per kg of steam entering the first-stage turbine.
      b) The thermal efficiency.
      c) The rate of heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine.

1. (a) The air conditioning unit of a car is operating on a summer day when the temperature is 37°C. It cools the air to 6°C using 3kW of power output. The A/C has a COP of 4. Find the mass flow rate of the cold air that the A/C unit can provide on that particular day. (15 points)

2. (b) A building freezer that is used to freeze vegetables requires 40 tons of refrigeration to keep the food frozen. The temperature of the freezer is -35°C and the ambient temperature outside the building is 30°C. If the performance of the freezer is 20% of the theoretical best possible cycle, what is the power required to run the freezer. 1 ton of refrigeration is equivalent to 210 kJ/min. (15 points

Lesson: Robot mechanics

3-) Design your own original determined by the dimensions and Cartesian (PPP), Cylindrical (RPP), Spherical (RRP), the vertical axis (Scar) (RRP) or joint (RRR) manipulator forward and inverse kinematic calculations for a medical Denavit-Hardenberg by filling in the table write the solution approaches.

Water is heated in a mixing chamber by mixing it with hot water coming from a heater. The mixing chamber loses heat to the surroundings at a rate of 5 kW. The hot water enters the mixing chamber at a rate of 1 kg/s. The mixed water leaves the chamber fully mixed. - The cold water enters the mixing chamber at 200 kPa and 20°C at a velocity of 3 m/s - The hot water enters at a pressure of 100 kPa and 150°C at a velocity of 2 m/s - The surroundings temperature is 10°C The mixture leaves the chamber at 150 kPa and 70°C at a velocity of 5 m/s. What is the mass flow rate of the cold water and the rate of entropy generation in this process?

Determine the magnitude and direction of the principal voltages for the voltage state given by ?_?? = 200, ?_?? = 400, ?_?? = −100 and ?_?? = ?_?? = ?_?? = 0 (all in MPa). Sketch Mohr's voltage circles in the ?? - plane and draw in the xy - plane the direction of its main voltages, coupled to the correct main voltage.

What is the greatest shear stress for this stress state?

Please explain the answer clearly and in a way easy to follow as I am still just a beginner. Thanks in advance!!

Using a large bucket whose volume is known and measuring the time it takes to fill the bucket with water from a garden hose, determine the mass flow rate and the average velocity of water through the hose.

***Note: It is an experiment you need to do it at home. Instead of a garden hose, you can use the same method on a faucet in your kitchen or in your bathroom. Explain the steps that you follow with actual photographs and numbers from your measurements

To transmit 75 kW at 25 rev/s using 48 mm diameter shafting. The flanges are to be made of cast iron and keyed to the shafts, and power is transmitted from one flange to the other by a circle of fitted bolts (four are shown in the above figure but more or less bolts can be used). The adopted bolts must comply to the following technical specification: Property Class Designation: 4.6

Nominal size range: M5 – M100 (Sizes M5 to M45 are commonly used in construction)

Material and Treatment: Low or medium carbon steel

Tensile Ultimate Strength, 400MPa, Minimum.

Tensile Yield Strength, 240MPa, Minimum.

CALCULATE THE FOLLOWING

Key analysis,

Hub analysis

Flange (web) analysis

Bolt analysis.

What is the acceleration of the 62 kg block if θ  = 34, μ _s = 0.4, and μ _k = .3? Round your answer to three significant figures.

If the block starts from rest at the position L = 25 m, how fast will it be traveling when it reaches the bottom of the incline? Round your answer to three significant figures.

The beam is fixed-supported at B and free at A.  Find the function, in terms of x, for the internal shear force in the beam.

W_o = 2 kip/ft

P = 5 kip

L = 8 ft

Input the terms of the function for the internal shear force in the beam. The function has the form: ax2 + bx + c (Units: kips)

Note that a, b and/or c may be 0.

Round answers to the nearest tenth.

Be sure to include the correct sign (+ or -).