# All Questions

9,533 questions
Filter by
Sorted by
Tagged with
21 views

### Finding the Initial Launch Velocity of a Ball Whose Launch Angle is Known and Trajectory Contains a Given Point (Accounting for Air Resistance)

I am working on a project that involves launching a ball through a basket (similar to basketball, but on a smaller scale for now). I haven't started building the project yet as I wanted to work out ...
17 views

### Best way to raise a platform while keeping it level?

I am looking at building my dad a shopping cart since he has balance issues. I am thinking of trying to make it have a moving platform able to support about 50 pounds of groceries(I am kind of ...
49 views

### Regarding design of a compressed air delivery system based on a screw air compressor

I want to select a screw compressor for my application wherein I need a pressure of about 18 psig, and 300 cfm at the aforementioned pressure. The compressors I'm finding suitable for the system have ...
27 views

21 views

### How to calculate the vertical effective stress at the middle of a clay that is sandwiched between two layers of sand?

The following is the question: A layer of silty clay 5.2 m thick with unit weight 18.6 kN/m3 is sandwiched between two layers of sand, each 4 m thick with unit weight 17.3 kN/m3. The water table in ...
5k views

### Why do oil tankers heat crude oil?

About all those oil tankers off the coast of California … | Grist The giant ships burn fuel to keep lights on, power equipment, and heat the large volumes of crude oil resting in their tanks. I'm ...
32 views

### Why would a specfication for a motor require that overtemperature protection be realized by modeling heat generation and not with an embedded sensor?

I'm reading the procurement documents for the R211 railcar contract, which is for electric multiple unit subway cars designed for rapid transit applications in New York City. The railcar's propulsion ...
30 views

### Why are tank cars cylindrical?

Hold height constant. Then a Rectangular Prism, with length and width = radius of the cylinder, has greater volume! So why aren't tank wagons (railroad vehicles that transport gas and liquid) ...
42 views

### How can I create a small pump that can pull fish to a higher elevation without killing them?

(for the record, I already attempted to ask this in the physics stackoverflow) I'm attempting to create something similar to a vertical multi-siphon. The device would pull water from multiple sources,...
40 views

### How far can we compress air manually?

I am not sure if such devices even exist, but I'm sure we can improvise. A device in which we could (manually) turn a shaft, screw a screw, or hammer an air-tight follower into a strong walled ...
15 views

### What are the hypersonic Normal shock relationships?

I am learning about hypersonic flow now and there seems to be a lot of discussion about the oblique shock relationships as the Mach tends to be very large. I was wondering what happens to the normal ...
5 views

### Two model compare c2m histogram output reading in cloud compare

I have saved the data from histogram by c2m by this kind : So it excel it shown as this type: Also seen this question, so i know the class is the class color number (0-255 for rgb), and i guess ...
22 views

### When calculating a car's suspension caster, after turning the steering wheel 20 degrees, why multiply by 1.5?

To calculate caster of one side of a vehicle, the steering wheel is turned 20 degrees to the left, and the camber is obtained; this represents the 'in' value of the front right tire. Then the steering ...
16 views

### Determine compressive modulus from compressive strength data in spec sheet?

Is it possible to determine the compressive modulus of a polyethylene foam using the following spec sheet? Minicel Type M Foam It doesn’t contain any information regarding the compressive modulus, ...
18 views

### Fixed-Free End Column Design

I am currently working on a problem where I have to design a column. The structure I am currently designing currently takes the following form, When designing the column, I know that I have to ...
17 views

### Why are the hallways/public areas of apartment complex buildings always so “echo-y”?

Ever since I was a child, I've always been annoyed by and confused about why all the stairs and hallways on the way to an apartment, inside various buildings which hold many apartments, are always so "...
14 views

### How to calculate beam rotation value under torque with displacement results?

I'm trying to plot a Torque rotational curve with results generated using FEM software, how do I calculate the rotation(in rads) value from it? In my model, the forces were applied to the beam in a ...
7 views

### Magnetic Dipole Moment Measurement

I am interested in measuring the Magnetic (Dipole) Moment of a piece of HW. Is there any source where I can find a procedure to do that? Thanks a lot.
30 views

### Degree of Freedoms in a Node of a 3D Frame/Beam Element

I recently took a quiz for my Matrix Methods of Structural Analysis Class, in which I encountered the following MCQ. My answer of '6' was justified, in my opinion, by the size of the stiffness matrix ...
12 views

### Cloudcompare Cut at specific coordination by one reference cut (third part of question)

according to these two previous question: Cloud compare Cut at specific coordination by one reference cut and : Cloud-compare Cut at specific coordination by one reference cut (second part of ...
20 views

### What does the Torque vs Frequency plot mean for a stepper motor

I found this motor which I believed had interesting specs, but when I checked out the data sheet, the torque-speed graph was replaced by a torque-frequency graph! I do not know what it means. How does ...
19 views

### Calculating force transferred from pinion gear to rack

I am really challenged as I need to fit a bunch of motors in a 6" box acting as linear actuators. I was looking for linear actuators (most I found were brushed DC) at first but the ones I found that ...
7 views

### Max temperature that can produce saturated vapor

I am trying to find the specific enthalpy of saturated water vapor at 500 degrees Celsius, but all of the tables I have seen only go up to 373 degrees Celsius. Is this the maximum temperature that can ...
33 views

### What is the specific issue with frequency fluctuation in the grid?

I understand that if supply and demand are not in equilibrium synchronous generators make the difference by increasing or decreasing their rotational energy - thus changing the electrical frequency in ...