01/13/21

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The first word spoken on the surface of the Moon after Apollo 15 landed on July 30, 1971, was “Bam!” this was James Irwin’s involuntary reaction to their rather bone-jarring touchdown. “We hit... more
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10/26/20

physics question - static fluids
You need to determine the average density of an irregularly shaped, non-uniform object. You have a spring scale. When you hang the object motionlessly from the scale, you measure a mass of 12.7 kg.... more
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10/22/20

URGENT PLS HELP
A 1.16 KG block of cheese sit on a level table, as shown. The coefficient of static friction is 0.15. Three strings are tied together in a knot at K. Kc is horizontal and fastened to the cheese. Kw... more
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10/11/20

Problem #2: An apple is thrown upward with an initial velocity of +24.0 m/s.

a. Sketch the apple’s trip and label what you know.b. How high will the apple go? (Ans: +29.4 m)c. What is the total time needed for the apple to return to its original position? (Ans: 4.90 s)USING... more
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05/20/20

can some one please explain
How many grams of iron (Fe, molar mass = 55.85 g∙mol–1) is needed to experimentally produce 50.0 g of iron(III) oxide (Fe2O3, molar mass = 159.70 g∙mol–1) if the percent yield is 78.7%?   
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05/20/20

Strontium (average atomic mass = 87.62) naturally exists as 4 stable isotopes with masses of 84, 86, 87, and 88. Which statement is correct?
Strontium-88 is the most abundant.Strontium-87 is the most abundant.All strontium isotopes are equally abundant.Strontium-86 is the most abundant.
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05/20/20

How many moles of O2 are needed to produce 0.756 of water?
Please help I can’t remember how to do this !!!
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04/13/20

Independence Day Movie Question
In the opening scene, the alien spacecraft is seen near the Earth's Moon. The Moon is shown to be vibrating due to the mass of the spacecraft. Is this scene plausible? Explain your reasoning? 
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06/19/19

If the moon was purple what colour would the sun be?
Think if instead of white the moon would be purple!Based if this considering the sun gives the moon its light and the moon sometimes appears orange like the sun in turn what colour would the sun... more
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06/16/19

Which geological processes will destroy plastic?
The geological record at the end of the Anthropocene will undoubtedly contain large volumes of plastic. However, some geological processes will completely destroy plastic (e.g. magmatic or... more
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06/16/19

Unprotect a Word Document?
Can't edit a specific document in Word 2007. How do I remove the password protection (unprotect) on a Word document if I don't know the password? (i.e. The protection provided by Tools >... more
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06/15/19

How do we estimate $10^{23}$ stars in the observable universe?
Now, I read somewhere, that there are 4,106,234 stars in the observable universe. How did scientists estimate this?
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06/13/19

How can I determine if my telescope mirror is parabolic?
This week I purchased the “Skywatcher Explorer 130P Newtonian Reflector Telescope”, specifically as it has the parabolic mirror. I do not have the outer packaging for sundry reasons. Therefore,... more
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06/05/19

Automatically resize picture/image in Word?
I'm using Microsoft Word 2007. I have several large screenshots that need to be inserted into the document at various places. When I paste the pictures, I have to manually resize them to fit... more
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06/02/19

Were all of Earth's minerals created before Earth's formation, during, or after?
I've heard that during the accretion of proto-planets that formed the earth, 60 minerals were created through the reactions of atoms and molecules in the nebula.Do these first minerals still make... more
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05/31/19

Can I change keyboard shortcuts for Redo in MS Word for Mac?
All Mac applications use ⇧-Cmd-Z to redo the last undone action. All, that is, except Microsoft Office. Office prefers that you use Cmd-Y instead. ⇧-Cmd-Z is mapped to something else – worse, it's... more
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05/30/19

How much of a mountain is below the surface?
Is there some kind of math rule for how much does a mountain extend (depth) below the surface?I found an article like this... more
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05/29/19

Type math formulas in Microsoft Word the LaTeX way?
I wonder if there is some free solutions for typing math formulas the LaTeX way in Microsoft Word document (Office 2007)?
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05/12/19

Will dust storms be more frequent in the future?
I noticed that in some science fiction movies set in the future on Earth, like Wall-E and Interstellar, dust storms are very prominent. Are there any scientific hypotheses suggesting that dust... more
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05/09/19

Are there water molecules in the oceans which will almost never fall down as rain?
Some oceans are very deep. But is there also current (convection) deep in the ocean so that all water molecules will ones be evaporated and fall down as rain or is it very quite at the bottom so... more
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05/06/19

Equinoxes and solstices: start of the season or mid-season?
In the United States, the upcoming autumnal equinox is marked on most calendars as the "first day of autumn." Similarly the solstices are commonly called the "first day of summer" and "first day of... more
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04/27/19

PPT to PNG with trasparent background?
I have a PowerPoint .ppt file and I have to create an image for every slide. I'm trying to use the integrated PowerPoint "export as .png". It works but the images have all a opaque background, I... more
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04/19/19

How do I show speaker notes on the laptop and slides on the video projector?
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04/06/19

Which type of scientific reasoning is being described in the situation?
Consider the situation.Scientists discovered a sedimentary layer of earth with high amounts of the element iridium. This layer was laid down about the time at which the dinosaurs went extinct.... more
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03/05/19

Why YouTube's location and language settings are reset automatically after cookies deleting?
Who knows how to fix it?
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