How do I set crosshair rotation in SketchUp?
You cannot set a viewport crosshair rotation in SketchUp. Views in SketchUp use an orthographic projection and are positioned in relation to the origin of the model and the center point of the viewport. You can use the 'Orbit' tool to rotate the view around the center of the viewport and the 'Zoom Extents' to quickly reset the camera back to the same viewing angle.
What are the two postulates of special relativity?
1. The laws of physics are the same in all inertial frames of reference (i.e. frames of reference in which a body is either at rest or in uniform straight-line motion).
2. The speed of light in a vacuum is the same for all observers, regardless of their relative motion or of the source of the light.The second postulate states that the laws of physics must be the same in all inertial frames. In other words, the same physical laws (such as Newton's laws of motion) must apply regardless of what kind of motion an observer is undergoing. This postulate implies that there is no absolute reference frame in the universe – all frames of reference must have equal status.
How to make Visio diagrams easier to read?
1. Use High Contrast Graphics: Make sure that lines, text, and graphics are in high contrast with each other for easy readability.
2. Make Text Big: Make sure your text is highly legible. Use a large font size, such as 12 points or higher for easy reading.
3. Make Navigational Arrows: Utilize arrows to indicate the sequence of flow.
4. Use Standardization: Utilize a standard color palette, font size, line weight, and arrow direction throughout your diagram.
5. Use Bounding Boxes: Utilize boxes to make text and graphics look like they fit together, making it easier to read the flow of your diagram.
6. Keep It Simple: Avoid using too many elements in your diagrams, as this can make them difficult to read. Use the most necessary elements and make sure to keep them well organized.
Where can I find exposure limits for organic solvents?
Exposure limits for organic solvents can vary from country to country and can also depend on the type of solvent and the concentration in which it may be used. Many organizations, such as the Occupational Safety and Health Administration in the United States, maintain lists of permissible exposure limits (PELs) and thresholds limit values (TLVs) for a variety of organic solvents. These lists can be found online on the organization's website. Additionally, the Agency for Toxic Substances and Disease Registry (ATSDR) also has lists of health-based exposure limits, which can be searched by chemical name.
What happens when ethanol reacts with ethanoic acid?
When ethanol (C2H5OH) reacts with ethanoic acid (CH3COOH), an ester, ethyl ethanoate (C2H5OCOCH3), is formed. This reaction is an example of a Fischer Esterification reaction, in which an ester is produced when a carboxylic acid reacts with an alcohol in the presence of an acid catalyst.