Homework Help for Mechanical Engineering

During air cooling of oranges, grapefruit, and tangelos, the heat transfer coefficient for combined convection, radiation, and evaporation for air velocities of   0.11<V<0.33 m/s is determined experimentally and is expressed as h=5.05 kairRe1/3/D, where the diameter D is the characteristic length. Oranges are cooled by refrigerated air at 5C and 1 atm at a velocity of 0.3 m/s.

Determine (a) the initial rate of heat transfer from a 7-cm-diameter orange initially at 15C  with a thermal conductivity of 0.50 W/mC,

(b) the value of the initial temperature gradient inside the orange at the surface, and

(c) the value of the Nusselt number.

A hollow nickel-steel shaft, whose outside diameter is twice the inside diameter, is to transmit 1492KW at 220 rpm. The shaft is subjected essentially to torsion. Assuming an allowable shear stress of 224Ma, determine the size of the hollow shaft required.  

Assume that an object with mass is dropped from a height and that the height of the object after seconds is:
where gravity = 32.17 /, the coefficient of air resistance = 0.25 − /, the mass is 200 lb, and the initial position = 300 feet. Find the time it takes for the jumper to hit the ground to within .01 seconds. Find the time using the four methods used in the course to date: bisection, fixed-point iteration, Newton's method, and the secant method, if possible. Create a table showing the performance of each method used in reaching the solution

I need solving problem of manufacturing automation book of Altintas

A golf ball is driven with the initial conditions shown in the figure. If the wind imparts a constant horizontal deceleration of 3.8 ft/, determine the values of r, , , , , and when t = 1.22 sec. Take the r-coordinate to be measured from the origin.

Answers:

r = _______ ft

= _______ ft/sec

 = _______ ft/

 = _______  

= _______ rad/sec

 = _______

A golf ball is driven with the initial conditions shown in the figure. If the wind imparts a constant horizontal deceleration of 4.6 ft/, determine the values of r, , , , , and when  t = 1.25 sec. Take the r-coordinate to be measured from the origin.

Using the weather forecast today (Oct 24 which is 29 degree Celsius), determine the enthalpy spe.volume, relative humidity, dew point, specific humidity & humidity ratio., Use a psychrometric chart & digital.

Instruction: Determine the quality (Q) of the damped harmonic oscillator shown above. 

1. A piston–cylinder device contains 5 kg of water at 800kPa and 70°C. The water is now cool at constant pressure until it exists as a liquid at 15°C. Determine the amount of heat loss and show the process on a T-v diagram with respect to saturation lines.

How do I determine the heat loss?

1. (a) How many ohms are there in a 7.85-megohm resistor?

What is the length of three springs connected in series and parallel? Change in length of the spring is 4cm.

Show all construction lines.