Physical sciences category

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Physics

Space and astronomy

Posted by DancesWithWolves some time ago

What you think about , William Shatner going into space at age 90?

Posted by Linda Joy some time ago

How can such a tiny thing be such big news?! First time ever quantum entanglement in space!

Posted by Linda Joy some time ago

True or False: Massless particles don't experience time.

Posted by Linda Joy some time ago

Is it murder to kill time?

Posted by Zim1 some time ago

What are the three equations of static equilibrium?

Posted by JAniiilll some time ago

what is the si unit of work

Posted by Denmarks some time ago

Will there ever be a solution to the theory of everything?

Posted by Frank Bristol some time ago

If you stack one chair on top of another chair will it take double the weight ?

Posted by Linda Joy some time ago

What are your thoughts on the 'Giant Arc'?

Posted by Gabriela4678 some time ago

Two samples of cooper(II) sulfate solution with concentrations of 0.080M and 0.30M were analysed using a spectrophotometer. Which sample would show the strongest absorption of light? PLS HELP ME. Im dumb in Chem :)

Posted by Coco Rose some time ago

which percentage of people probably believe the moon landings were real? why many think they were faked?

Posted by PookieNumNums some time ago

How come sometimes when you lightly hit your head if feels like it's bleeding?

Posted by Yoza some time ago

How much the impact i will get if i gets hit by the whole water night tide. And i move as earth rotate with 1000 miles per hour.

Posted by Yoza some time ago

1 ton satelite and 0.5 ton satelite. If i want to put them on the same altitude. Should i set the same speed?

Posted by Zeljko some time ago

If all the things that make my consciousness as it is are recreated again neons of years from now, does that mean that I am going to be alive again. But shouldnt this mean that there are creatures that exist in more places at once?

Posted by Ali Fayyad some time ago

Knowing that the couple shown acts in a vertical plane. Determine the stress at point A and B

Posted by WorldOpenSkies2222 some time ago

Do you believe in extraterrestrials?

Posted by Shekainah Mae Centino some time ago

A +100 μC charge is placed at the origin. A -50 μC is placed at x=2m and a +200 μC is placed at x= -4m. What is the net electric force acting on the +100 μC charge?

Posted by Zim1 some time ago

Explain the difference between Direct Numerical Control and Distributed Numerical Control and show it by means of simple block diagrams.

Posted by Zim1 some time ago

What causes shear failure and member tear in riveted joints?

Posted by Zim1 some time ago

Define fatigue failure. What are its characteristics?

Posted by Zim1 some time ago

a) Why are washers used with fasteners? b) Which is the preferred key type used on tapered shafts and explain the reason for it?

Posted by Zim1 some time ago

Define factor of safety for brittle materials.

Posted by Zim1 some time ago

Is the yield point well defined in the case of brittle materials? Explain with reasons.

Posted by Zim1 some time ago

An object of mass 10 kg encounters a frictional force when sliding to the right. Given the coefficient of friction between the object and the surface is 0.15, determine: a) The normal force b) The gravitational force c) The frictional force Assume value of gravitaton constant g = 9.81m/s2

Posted by Zim1 some time ago

a) Explain the process of creep as applied to metals.

Posted by Zim1 some time ago

We have a plate of width 200 mm and thickness 12 mm. A tensile load of F = 210 is applied along the axis of this plate. a) Determine the tensile stress in the plate. b) Using a safety factor of 2, determine whether the plates will fail or not if the yield strength of the plate material is 270 MPa.

Posted by Arik Gitman some time ago

If Robin Hood applies a 15N force to pull his bow back by 0.25 m, with what speed will his 0.150 kg arrow leave the bow?

Posted by Alfred Provido some time ago

A 4.0520g sample of hydrochloric acid, sp. Gr. 1.18, required 44.15ml of 0.9035N sodium hydroxide in a titration. Calculate (a.) %w/w HCl (b.) HCl content (c.) normality, (d.) Na2CO3 titer of the sample MW = 106

Posted by Linda Joy some time ago

What do you think of the space plasma hurricane?

Posted by Linda Joy some time ago

What do you know about light, or enlightenment?

Posted by Kokoi12 some time ago

Discuss what will happen if a beam of white light with frequency between 4x1014 Hz to 7.9x1014 Hz is incident on both surfaces.

Posted by Linda Joy some time ago

Did you know a tractor beam can be produced using matter waves now in addition to light and sound waves?

Posted by bostjan64 some time ago

If an asteroid hits the Earth on election's eve, will the people still be able to vote?

Posted by Linda Joy some time ago

Will you be watching the eclipse or the meteor showers?

Posted by DancesWithWolves some time ago

Which Program Was Better : Lost In Space or Star Wars ?

Posted by Roaring some time ago

If you punch three holes in a container near the bottom, middle and near the top, and fill with water, which hole squirts the water farthest?

Posted by bostjan64 some time ago

At what temperature do ideas boil?

Posted by Creamcrackered some time ago

Does math exist in reality?

Posted by bostjan64 some time ago

What is your favourite heavy metal?

Posted by Lauren674 some time ago

Calculating concentration of fluoride in a homemade mouthwash.

Posted by Linda Joy some time ago

Will you be watching the perseids meteor shower?

Posted by Nicole Osborne some time ago

a) If 14.6 mL of HNO3 reacts with 25.0 mL of 0.750 M Ca(OH)2, what is the molarity of the HNO3 solution? b) What volume of 0.300 M Ca(OH)2 is required to react with 250.0 mL of 0.500 M HNO3?

Posted by Sylvester10 some time ago

What is the criterion for choosing the type of Van der Waals correction in Quantum Espresso calculations?

Posted by Nicole Osborne some time ago

What volume (in L) of hydrogen at STP is produced as sulfuric acid (H2SO4) acts on 102 g of metallic calcium (Ca).

Posted by Nicole Osborne some time ago

A) Starting with 600.0g of glucose, what is the theoretical yield of ethyl alcohol? B) If 76.9g of C2H5OH was obtained, what was the percentage yield?

Posted by Nicole Osborne some time ago

For the reaction: 2Fe + 3CuCl2 = 2FeCl3 + 3Cu. 10g of Fe and 18.0g of CuCl2 are mixed together and a reaction occurs.

Posted by Nicole Osborne some time ago

What is the maximum weight of SO3 that could be made from 10.0 g of SO2 and 5.00 g of O2 by the following reaction?

Posted by Nicole Osborne some time ago

How many grams of iron (III) oxide would ideally be formed by the reaction of 55.0 g Fe with excess oxygen gas? If the actual reaction involving this same 55.0 g Fe produced only 26.9 g of iron (III) oxide, what would be the percent yield?

Posted by Nicole Osborne some time ago

Determine the mass of CO2 and H2O produced on combusting 140 g of C2H2 in the presence of excess O2.

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