• Physics Calculators, Also tutorials, formulas and answers on many physics topics.
  • This free app is a handy tool for calculating the grid spacing at a wall to achieve a target y+ value for viscous computational fluid dynamics (CFD) computations. Simply specify the flow conditions, the desired y+ value, and compute your grid spacing. The Y+ Calculator converts between SI and Imperial units.
  • The above steel beam span calculator is a versatile structural engineering tool used to calculate the bending moment in an aluminium, wood or steel beam. It can also be used as a beam load capacity calculator by using it as a bending stress or shear stress calculator.

In my previous article I detailed the steps to get started with PowerApps by signing up to the PowerApps portal.

Download this app from Microsoft Store for Windows 10, Windows 10 Mobile, Windows 10 Team (Surface Hub). See screenshots, read the latest customer reviews, and compare ratings for Basic Calculator - Free.

Now, let me walk you through the steps to create and publish a simple ‘Calculator’ App.

The Calculator App will have 2 Text boxes and an ‘Operation’ dropdown. Upon clicking the ‘Calculate’ button, based on the Operation we either Sum or Subtract the values and show the result.

Pre-requisites:

  • You must have PowerApps account. Refer my previous article

Steps to build ‘Calculator’ App UI:

  • Connect to the PowerApp studio and click on ‘New App’ of Mode ‘Canvas’
  • From the ribbon, click on ‘Insert’ tab and drag & drop the controls on to the Canvas
  • For the ‘Text Input’ controls, select ‘Format’ as ‘Number’ so that it only allow digits.
  • Add the ‘Dropdown’ control to the Screen
    • To add “Sum”,”Substract” as options to the ‘Dropdown’, select ‘Items‘ property and set [“Sum”,”Substract”]
  • Add the ‘Button’ control to the screen and set the text as “Calculate”
  • Add 3 labels
    • Label ‘A’, Label ‘B’ and Label ‘Result’

Steps to add the business logic:

  • On buttons ‘OnSelect’ event,
    • Declare a variable “varResult”
    • Read the selected operation (i.e., Sum/Subtract) from the Dropdown
    • Write an If/Else statement
      • Add TextA, TextB; if the dropdown values is ‘Sum’ If(ddlOperation.Selected.Value=”Sum”,txtA.Text+txtB.Text))
      • Subtract TextA, TextB; if the dropdown values is ‘Substract’ If(ddlOperation.Selected.Value=”Substract”,txtA.TexttxtB.Text))
      • Set the Sum/Subtract value to the “varResult” variable using ‘Set‘ method
    • Finally, we should display the result by setting it to ‘Result’ label. So, set ‘Text’ as ‘varResult’
Basic dynamics calculator 2

Time to Test the App:

  • Press F5 to test the App
BasicCalculator

Save and Publish the App:

Once you done with testing, its time to Save and Publish the App.

  • To save the App, either press (Ctrl+S) or go to File -> Save
  • Choose either ‘The Cloud’ option or ‘This computer’
    • ‘Cloud’ option would save the App in your ‘PowerApps’ account
    • ‘Computer’ option would provide the App in .zip folder to save locally.
  • Post save, to make the App available to Users, click on ‘Publish’

Notes:

  • PowerApps provides excel like formulas to apply business rules. Refer this blog to get exhaustive list of formulas.

🙂

Wind load on surface - Wind load calculator

When moving air - wind - is stopped by a surface - the dynamic energy in the wind is transformed to pressure. The pressure acting the surface transforms to a force

Fw = pd A

= 1/2 ρ v2 A (1)

where

Fw = wind force (N)

A = surface area (m2)

Basic Calculator Instructions

pd = dynamic pressure (Pa)

Basic

ρ = density of air (kg/m3)

v = wind speed (m/s)

Note - in practice wind force acting on a object creates more complex forces due to drag and other effects.

Wind Load Calculator

air density (kg/m3)

wind speed (m/s)

area (m2)

Wind Speed
(m/s)
Wind Load1)
(Pa)
10.6
22.4
35.4
49.6
515
622
729
838
949
1060
1173
1286
13101
14118
15135
16154
17173
18194
19217
20240
21265
22290
23317
24346
25375
26406
27437
28470
29505
30540
31577
32614
33653
34694
35735
36778
37821
38866
39913
40960
411009
421058
431109
441162
451215
461270
471325
481382
491441
501500

1)density of air 1.2 kg/m3

  • 1 m/s = 3.6 km/h = 196.85 ft/min = 2.237 mph
  • 1 Pa = 1 N/m2 = 1.4504x10-4 psi (lb/in2)

Example - Hurricane Wind Load acting on a Wall Surface

A hurricane with wind speed 35 m/s is acting on a 10 m2wall. The dynamic force can be calculated as

Fw = 1/2 ρ v2 A

= 1/2 (1.2 kg/m3) (35 m/s)2 (10 m2)

= 7350 N

= 7.35 kN

Or - from the table above the wind load per square metre is 735 N/m2. The total load on the wall can be calculated as

(735 N/m2) (10 m2) = 7350 N

A hurricane acting on a 10 m2 wall creates a force equal to the weight of aprox. 750 kg.

Related Topics

  • Mechanics - Forces, acceleration, displacement, vectors, motion, momentum, energy of objects and more

Related Documents

Basic Dynamics Calculator

Basic Dynamics Equations

  • Air Curtains and Air Screens - Air curtains or air screens in open doorways are used to keep acceptable indoor comfort in buildings
  • Beaufort Wind Scale - The Beaufort description and observation of wind and wind speed
  • Drag Coefficient - The drag coefficient of an object in a moving fluid influence drag force
  • Dynamic Pressure - Dynamic pressure is the kinetic energy per unit volume of a fluid
  • Force - Newton's third law - mass and acceleration
  • Fujita-Pearson Tornado Intensity Scale - Rating tornado intensity scale
  • Hurricane Intensity Scale - Saffir-Simpson damage potential scale for hurricanes
  • Kinetic Energy - Kinetic energy of a rigid body is the energy possessed by its motion
  • Speed vs. Time and Distance Traveled Graph Calculator - Velocity plotted against time diagram
  • Wind Chill Index - The Wind Chill Index - or the Effective Temperature - of air in movement
  • Wind Energy - Available wind energy
  • Wind Power - Power generated from the wind
  • Wind Shear - Wind slowed down at surface by trees and obstructions
  • Wind Turbine Power Calculator - Online wind turbine calculator

Tag Search

Basic Calculator Function Keys

  • en: wind load
  • es: carga de viento
  • de: Windlast
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