Homework Help for Mechanical Engineering

You’re a mechanical designer at a company that makes machines that manufacture pills. To prevent damage to the pills, you often use helical gears to reduce vibrations. A new hire, Darcy Hogg, emails you for advice. Darcy didn’t learn about helical gears in college and he seems
nervous in his new role at your company. He has worked out specs for helical gears to achieve a 4.4:1 reduction but can’t find the gears in catalogs. In an email, gently correct Darcy’s misunderstandings and offer him advice on selecting gears. You can refer to things like a catalog page but you cannot select the gears for Darcy because you want Darcy to develop independence.

You should catch 4 conceptual errors. 

Darcy’s email is as follows:

Hi,
I need help finding gears with the attached specs on McMaster-Carr. I don’t think the website works right. Do you think we should go ahead and get custom gears?

A file is attached showing the specs for a pinion and gear to achieve a reduction of 4.4. I got 4.36. Is that okay?

To make the design as compact as possible, I wanted 11 teeth on the pinion. I picked the specs so the gears would have a ratio of about 4.4, to get the desired reduction. 11 times 4.4 is not an exact integer so I rounded to 48. I picked Q10 and stainless because we want smooth operation and because corrosion could cause problems with FDA approval. I matched the helix and pressure angles on each gear. I put a higher pressure angle on the gear because it carries more force; I also gave the gear a wider face so it could carry double the load. I made sure that both gears were right-handed because that’s the standard. I couldn’t get the diameters on the pinion to line up right so I just copied those numbers over from the Excel calculator for the gear.

The question is about flow rate

The question is about fluid mechanics, caculating pressure drop

This is a heat transfer problem, please see attached document. The following values are needed to solve:

The top and bottom surfaces of a flat plate are open to air. Here, the air flowing over the bottom surface has a free stream temperature of 330 degrees Celsius and a free stream velocity of 9 meters per second. Whereas, the air flowing over the top surface has a free stream temperature of 420 degrees Celsius and free stream velocity of 6.5 meters per second. Here, the plate's surface temperature is uncertain

Find the following:
a. Assuming that the plate is isothermal in its thickness and that conduction in the x axis of the plate can be ignored, find the temperature of the plate at a distance of 0.7 meters downstream of the plates leading edge?
b. write your though on if the local temperature of the plate is unaffected by x? That is, for every x value, is the plate the same temperature?
Note: evaluate the properties at a film temperature that is equal to the average of both the free stream temperatures of air, and the order of the temperatures in the equation shows the direction of heat flow for Newton's law of cooling.

On the left side (x = 0), right side (x = L), and bottom side (y = 0), a 2 Dimensional rectangular solid is held at a constant temperature of zero, while the top surface of the solid (y = W) dissipates the heat by convection process with an heat transfer coefficient of h into a fluid which has a temperature To. In the y direction, the solid has length A, and in the x direction, it has length B. find, a. Find the transcendental equation and then solve for an expression giving the eigen values explicitly as well. b. Define the temperature profile as a function of the eigenvalues, x, y and a constant Cn. c. Define Cn as a function of x, To, h, W, k, L and eigen values

problem attached. see attachment

The base plate of a 1200-W household iron has a thickness of L = 0.7 cm, base area of A =   , and thermal conductivity of k =13 W/m.^oC.

The inner surface of the base plate is subjected to a uniform heat flux which is generated by the resistance heater inside, and the outer surface loses heat to the surroundings at T∞ = 25 ^oC by convection.

Using a convection heat transfer coefficient of h = 72 W/m2. ^oC and ignoring heat loss by radiation, acquire an expression for the variation of temperature in the base plate, and evaluate the temperature at the inner and outer surfaces. A detailed calculation and explanation of each step in the procedure is required.

A mass of 200 g of saturated liquid water is completely vaporized at a
constant pressure of 100 kPa. Determine (a) the volume change and (b) the
amount of energy transferred to the water.

i have attached all the info needed to ask the question

answer and explain clearly

_URGENTLY_Hello I need to answer this introduction to robotics questions. Thank you by now. _PLEASE RAPIDLY HELP_

_URGENTLY_Hello I need to answer this introduction to robotics questions. Thank you by now. _PLEASE RAPIDLY HELP_

The equation of motion for a pendulum whose base is accelerating horizontally with an acceleration 𝑎(𝑡) is:

𝐿𝜃̈+ 𝑔𝜃 = 𝑎(𝑡) cos 𝜃

Suppose that 𝑔=9.81 m/sec^2, 𝐿=1 m, and 𝜃̇ (0) = 0. Obtain Numerical solution using built-in numerical solver and Simulink for the three cases. Produce animation of the pendulum motion for 0 ≤ 𝑡 ≤ 15 sec.

1. The acceleration is constant: 𝑎(𝑡)=5 m/sec^2, and 𝜃 (0) =0.5 rad.
2. The acceleration is constant: 𝑎(𝑡)=5 m/sec^2, and 𝜃 (0) =3 rad.
3. The acceleration is linear with time: 𝑎(𝑡)=0.5𝑡 m/sec^2, and 𝜃 (0) =3 rad.

Write a Matlab code and show the simulink animation. Show step by step solution