Answers edited by Oscar L.

• Back to user's profile
• Next
• 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#
  
• Question #f635a
  
• Why do stellar parallax measurements work only with relatively nearby stars?
  
• What silicate mineral is the basic building block of many rocks?
  
• How many AU are between Saturn's largest moon, Titan from the sun and the earth?
  
• Question #bb58b
  
• In the southern hemisphere, does the Moon appear to start its waxing phase in reverse?
  
• What is the closest star to Earth besides the sun?
  
• What are examples of transition metals and their uses?
  
• Where does the production of Carbon-14 occur?
  
• How many known satellites does Mars have?
  
• How do you simplify #arcsin(sin(pi/8))#?
  
• What is the equation of the circle with a center at #(7 ,1 )# and a radius of #2 #?
  
• How would you balance the following equation: #"S" + "HNO"_3 -> "H"_2"SO"_4 + "NO"_2 + "H"_2"O"# ?
  
• How do I evaluate cos(pi/5) without using a calculator?
  
• What is the dominant mountain range on the East Coast?
  
• The smallest daily tidal range occurs during which type of tide?
  
• Is the outer core made of iron and nickel?
  
• If there is a supermassive black hole at the centre of our galaxy, why is our galaxy so stable?
  
• 22.4 L of hydrogen gas contains how many molecules?
  
• What are the six strongest acids? What are the six strongest bases?
  
• Decomposition of a #97.1*g# mass of potassium chlorate, #KClO_3#, yields what mass of dioxygen?
  
• 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?
  
• Question #19980
  
• What observation of seismic-wave travel led to the discovery of Moho?
  
• 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?
  
• Does special relativity affect biological processes, such as aging?
  
• What is the integral of #int tan^5(x)#?
  
• What is the standard form of #y=(x-3)^2+3#?
  
• 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 was Andrija Mohorovicic famous for?
  
• How many molecules are in 165 g of carbon dioxide?
  
• How do you evaluate #cot (690)#?
  
• How do you balance #Zn(OH)_2 + CH_3COOH -> Zn(CH_3COO)_2 + H_2O#?
  
• How do scientists determine when one layer of the earth begins and ends?
  
• How much oxygen is the earth made of?
  
• Jupiter has sixteen satellites. What were the four largest ones discovered by Galileo?
  
• What is the net ionic reaction for the acid-base reaction of #"HCl"# with #"NaNO"_3#?
  
• Which planet has a moon with active volcanoes?
  
• How do you simplify hyperbolic function #cosh(lnt)#?
  
• How many significant figures are in the measurement 811.40 grams?
  
• 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?
  
• What is earth's lower mantle made of?
  
• 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?
  
• In the fourth dimension, is it possible to have a quadruple bond?
  
• Question #39c68
  
• How do you find the square roots of #-25i#?
  
• If #sintheta=1/3# and #theta# is in quadrant I, how do you evaluate #sin2theta#?
  
• How do you express #cos(pi/ 3 ) * sin( ( 5 pi) / 8 ) # without using products of trigonometric functions?
  
• Question #f472a
  
• Why are the rocks on the moon older than those on earth?
  
• Question #69fd6
  
• How do you evaluate #sec(sec^-1(1/3))#?
  
• What is the moho and what is it made of?
  
• Question #f339c
  
• What is an example of a double displacement reaction?
  
• Question #07d32
  
• What happens when the sun becomes a Black Dwarf? When will this take place in the future?
  
• 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.
  
• Which planet experiences constant daylight or darkness for 42 years at its poles?
  
• What is the moho discontinuity state of matter?
  
• 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?
  
• What is the Mojo layer inside the earth? How far down is it inside the earth?
  
• Clive's paper was returned with the answer "barium ll carbonate" marked wrong for the formula #BaCO_3#. Why was his answer wrong?
  
• What is the angle between #<-8,-5,2 > # and #<9,1,-3> #?
  
• How do you evaluate # tan(sin^-1(-1/6))#?
  
• Is it possible for the earth to be sucked into a black hole? If so, what would happen?
  
• Is the earth slowly getting closer to the sun as it orbits it? If not, what keeps it from being drawn into the sun?
  
• How do nonmetals react with acids?
  
• What does Ksp mean in chemistry?
  
• Question #bdf57
  
• 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 #3f6e6
  
• Question #7221f
  
• How could the freezing point depression of #CaCl_2# be smaller than #NaCl#?
  
• What do scientists learn about fossils by using carbon-14?
  
• Next