Answers edited by Oscar L.

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• How do you evaluate #cot (690)#?
  
• If sides A and B of a triangle have lengths of 1 and 6 respectively, and the angle between them is #(pi)/2#, then what is the area of the triangle?
  
• What is the moho discontinuity state of matter?
  
• If #sintheta=1/3# and #theta# is in quadrant I, how do you evaluate #sin2theta#?
  
• Question #7221f
  
• What is earth's lower mantle made of?
  
• Question #bb58b
  
• What does Ksp mean in chemistry?
  
• Is it possible for the earth to be sucked into a black hole? If so, what would happen?
  
• What are examples of transition metals and their uses?
  
• What is the equation of the circle with a center at #(7 ,1 )# and a radius of #2 #?
  
• Which planet has a moon with active volcanoes?
  
• Why are the rocks on the moon older than those on earth?
  
• A 2% by weight aqueous solution of NaCl (MW= 58.45) has a boiling point of 100.31 °C. What is the van't Hoff factor for NaCl?
  
• Question #07d32
  
• How many significant figures are in the measurement 811.40 grams?
  
• How do you evaluate # tan(sin^-1(-1/6))#?
  
• What happens when the sun becomes a Black Dwarf? When will this take place in the future?
  
• A man heats a balloon in the oven. If the balloon initially has a volume of 4 liters and a temperature of 20°C, what will the volume of the balloon be after he heats it to a temperature of 250°C?
  
• How could the freezing point depression of #CaCl_2# be smaller than #NaCl#?
  
• What are the six strongest acids? What are the six strongest bases?
  
• How do you express #cos(pi/ 3 ) * sin( ( 5 pi) / 8 ) # without using products of trigonometric functions?
  
• How many AU are between Saturn's largest moon, Titan from the sun and the earth?
  
• What is the net ionic reaction for the acid-base reaction of #"HCl"# with #"NaNO"_3#?
  
• Is the outer core made of iron and nickel?
  
• How do you find the square roots of #-25i#?
  
• Question #19980
  
• How much oxygen is the earth made of?
  
• What is the moho and what is it made of?
  
• What is the Mojo layer inside the earth? How far down is it inside the earth?
  
• Question #f339c
  
• A triangle has sides A, B, and C. Sides A and B have lengths of 2 and 4, respectively. The angle between A and C is #(7pi)/24# and the angle between B and C is # (5pi)/8#. What is the area of the triangle?
  
• Question #f472a
  
• What silicate mineral is the basic building block of many rocks?
  
• Question #69fd6
  
• Question #f635a
  
• Question #39c68
  
• Clive's paper was returned with the answer "barium ll carbonate" marked wrong for the formula #BaCO_3#. Why was his answer wrong?
  
• How many known satellites does Mars have?
  
• Is the earth slowly getting closer to the sun as it orbits it? If not, what keeps it from being drawn into the sun?
  
• In the southern hemisphere, does the Moon appear to start its waxing phase in reverse?
  
• The smallest daily tidal range occurs during which type of tide?
  
• If there is a supermassive black hole at the centre of our galaxy, why is our galaxy so stable?
  
• What is the standard form of #y=(x-3)^2+3#?
  
• How do scientists determine when one layer of the earth begins and ends?
  
• Jupiter has sixteen satellites. What were the four largest ones discovered by Galileo?
  
• The respective masses in amu of the proton, the neutron, and the nckel-60 atom are 1.00728, 1.00867, and 59.9308. What is the mass defect of the nickel-60 atom in g?
  
• What do scientists learn about fossils by using carbon-14?
  
• It is generally agreed that the earth's moon was formed when a Mars sized planet grazed the early earth. Is it possible that this planet was slightly bigger and that it not only formed the moon but the left over went on to end up as Mercury?
  
• Where does the production of Carbon-14 occur?
  
• Does special relativity affect biological processes, such as aging?
  
• Given the following, what is the tension in the string when the nearest mass is a distance of 686 km from the Black hole? #G=6.673×10^-11 m^3kg-1s-2#
  
• What is the dominant mountain range on the East Coast?
  
• What is an example of a double displacement reaction?
  
• What was Andrija Mohorovicic famous for?
  
• Is the Solar Wind comprised of actual matter along with energy? If so, is there a point at which the gravitational attraction of the Sun overcomes the Solar Wind?
  
• How many molecules are in 165 g of carbon dioxide?
  
• In the fourth dimension, is it possible to have a quadruple bond?
  
• What is the integral of #int tan^5(x)#?
  
• What observation of seismic-wave travel led to the discovery of Moho?
  
• How would you balance the following equation: #"S" + "HNO"_3 -> "H"_2"SO"_4 + "NO"_2 + "H"_2"O"# ?
  
• Why do stellar parallax measurements work only with relatively nearby stars?
  
• Question #3f6e6
  
• 22.4 L of hydrogen gas contains how many molecules?
  
• What is the angle between #<-8,-5,2 > # and #<9,1,-3> #?
  
• How do nonmetals react with acids?
  
• How do you simplify hyperbolic function #cosh(lnt)#?
  
• How do you simplify #arcsin(sin(pi/8))#?
  
• Question #bdf57
  
• What is the closest star to Earth besides the sun?
  
• Which planet experiences constant daylight or darkness for 42 years at its poles?
  
• Decomposition of a #97.1*g# mass of potassium chlorate, #KClO_3#, yields what mass of dioxygen?
  
• Boron has two isotopes, boron-10 and boron-11. Boron-10 has five protons and five neutrons. How many protons and neutrons does boron-11 have? Explain.
  
• How do you evaluate #sec(sec^-1(1/3))#?
  
• How do I evaluate cos(pi/5) without using a calculator?
  
• How do you balance #Zn(OH)_2 + CH_3COOH -> Zn(CH_3COO)_2 + H_2O#?
  
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