# Posts by rani

Total # Posts: 52

Math
Suppose it costs c \$260 to purchase us \$243.23 .What is exchange rate ?

Math
16/7:4/9=15/14:t=

Math
t:3/4=7/8:15/16=

Amos
What is the chemcal equation between ethanethiol and methoxide anyone?

SOCIAL
RIGHT WITHOUT DUTIES MEAN ANARCHY

physics
the no of wave in 6cm of vacum is same as that of no of wave in xcm of medium is 3/2 find the value of x

physics
Our Sun revolves about the center of our Galaxy at a distance of about lightyears What is the period of the Sun’s orbital motion about the center of the Galaxy?

physics
Use Kepler’s laws and the period of the Moon (27.4 d) to determine the period of an artificial satellite orbiting very near the Earth’s surface.

physics
Calculate the period of a satellite orbiting the Moon, 95 km above the Moon’s surface. Ignore effects of the Earth. The radius of the Moon is 1740 km.

physics
Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 4800 km.

physics
Calculate the force of Earth’s gravity on a spacecraft 2.00 Earth radii above the Earth’s surface if its mass is 1850 kg.

physics
Two objects attract each other gravitationally with a force of when they are 0.25 m apart. Their total mass is 4.00 kg. Find their individual masses

physics
7.4N

physics
A 75 kg hockey player glides across the ice on his skates with steel blades. What is the magnitude of the force of friction acting on the skater?

physics
20kg. Wt

Geomety
How do I find the image of O (0,0) after two reflections, first across x=a and then across y=b?

Physics
an object at rest explodes into three pieces of equal mass. one moves east at 20 m/s a second moves southeast at 30 m/s what is the velocity of the third piece??

math
A hobby shop has 4 times as manymodel airplanes as model helicopters.The total number of model airplanesand helicopters is 35. How manymodel airplanes does the hobby shophave?

math
beth travels 244 miles everyweek. she says she will travel 2,196 miles if she travels the same number of miles for the next 9 weeks.

chemistry (buffer)
If 5.00 mL of 1.60 nitric acid is added to a solution of 2.00 mmol thiocyanic acid (HSCN pKa=4.00) and 4.500 mmol calcium thiocyanide, assume a soluble salt- what is the pOG of the resultant complex solution (of total volume .350L). I worked the problem out and ended up ...

physics
a body cools from 80 degrees to 50 degrees in 5 minuts. calculate what time it will take to cool from 60 degrees to 30 degrees?

Chemistry
I want to have the details of the experiment title: Determine the equilibrium constant of a reversible reaction involving the iodine and the tri iodate ion reaction and also determine the gibbs free energy of the reaction.

math
Sorry the "Total Items \$\$ Total" was supposed to be 3 columns.

math
Okay, I have figured this out. Total Items \$\$ Total Books 175-v 5 5(175-v) Videos v 6 6v Total 175 --- \$910 5(175-v) + 6v = 910 875- 5v + 6v = 910 1v (or just v) = 910-875 v = 35, or 35 videos 35 videos at \$6 each = \$200 sold \$910-200 = \$710 left for books \$710/\$5 (books) = ...

math
Used books are being sold at \$5 and used videos are being sold at \$6. There are 175 total items sold and a total of \$910 collected. How many videos were sold?

Math
Reasoning. If you live 71mi from a river, does it make sense to say you live about 80 mi from the river? Explain

math
Supposed

math
AND WHAT IS THIS SUPPOAED TO TEACH MY DAUGHTER

science
unscramble ecrfenine

MATH grade 12
Determine the values of a M and N , so that the polynomial 2x^3+mx^2+nx-3 and X^3-3mx^2+2nx+4 are both divisible by x-2. I am so lost, i do not know how to start this problem! please help i have a test soon!

advance functions
Determine the values of a M and N , so that the polynomial 2x^3+mx^2+nx-3 and X^3-3mx^2+2nx+4 are both divisible by x-2. I am so lost, i do not know how to start this problem! please help i have a test soon!

Chemistry
A gaseous reaction occurs at a constant pressure of 50.0 atm and releases 55.6 kJ of heat. Before the reaction, the volume of the system was 7.60 L. After the reaction, the volume of the system was 2.00 L. Calculate the total internal energy change, Delta U, in kilojoules.

Chemistry
In lab we did thermochemistry, where we are supposed to find the heats of solution, heat change of calorimeter and molar heat solution of the salt. I calculated that the calorimeter constant for the water we had was 883.194 Joules. We took 1/10 of a mole of NH4Cl and tried to ...

maths
if cot theta =7/8 , evaluate (1+sin^2theta)(1-sin^2theta)/(1+cos^2theta)(1+cos-^2theta) the answer should be 49/64 but i couldn't get that answer. can any one help?

maths
if cot theta =7/8 , evaluate (1+sin^2theta)(1-sin^2theta)/(1+cost^2theta)(1+co-^2theta) the answer should be 49/64 but i couldn't get that answer. can any one help?

PHYSICS-radiation
Four billion years ago the Sun’s radiative output was 30% less than it is today. (i) If we assume the radius of the sun is the same, and that the Earth’s atmosphere was the same as it is now (that is, the atmosphere absorbs 10% of the incoming solar radiation and 80...

MATH/SCIENCE HELP
PROBLEMS: 1. In a measurement of precipitation (rainfall), a raingauge with an orifice (collector) area of 30.50 in2 collects 1.30 litres of water over a period of 26 minutes and 45 seconds.[10] Calculate: - The depth (amount) of rain that fell (in mm). - The intensity (mm h-1...

MATH/SCIENCE HELP
A)The depth (amount) of rain that fell (in mm). b. The intensity (mm h-1) at which the rain fell. c. The volume (m3) of water that would have fallen on an area of 7.00 acres. d. The discharge in m3 s-1 that would occur if all the water ran off the area in part c. in 3.00 hours...

MATH/SCIENCE HELP
1. In a measurement of precipitation (rainfall), a raingauge with an orifice (collector) area of 30.50 in2 collects 1.30 litres of water over a period of 26 minutes and 45 seconds.[10] Calculate: a. The depth (amount) of rain that fell (in mm). b. The intensity (mm h-1) at ...

Science!! Please HELP
If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)? Calculate the "doubling time" for this growth rate. Given this ...

Science!! Please HELP
If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)? Calculate the "doubling time" for this growth rate. Given this ...

Math - please elaborate
can someone please further explain my question on? it's just a farther bit down. The subject is "Math - help really needed" I think I almost got the answer, but I'm not sure where to go from there. really appreaite all the help so far as well; thank you. :)

Math - help really needed
I haven't learned what cot and csc are. Can I still solve this with just tan, cos, and sin?

Math - help really needed
but if I have identical denominators, why can't I just add the 1 to the tan^2X?

Math - help really needed
I'm really sorry. I don't want to sound stupid, but when I add tan^2x/tan^2x to 1/tan^2x I get 1+tan^2x/tan^2x and then the tans cancel out and I'm left with just one. Obviously, that's not correct, but I can't find my mistake.

Math - help really needed
okay, I'll try it out, thank you.

Math - help really needed
wait, for the first one if sin^2+cos^2=1, how did you even cancel some out?

Math - help really needed
oh, ok, I see. thank you all very much. I think I get it now, so hopefully I can actually get them on my own. :)

Math - help really needed
I'm sorry to double post; I don't want to seem impatient, but I really need help with this. Prove each idenity. 1+1/tan^2x=1/sin^2x 1/cosx-cosx=sinxtanx 1/sin^2x+1/cos^2x=1/sin^2xcos^2x 1/1-cos^2x+/1+cosx=2/sin^2x and (1-cos^2x)(1+1/tan^2x)= 1 I haven't even gotten...

Math - help really needed
Prove each idenity. 1+1/tan^2x=1/sin^2x 1/cosx-cosx=sinxtanx 1/sin^2x+1/cos^2x=1/sin^2xcos^2x 1/1-cos^2x+/1+cosx=2/sin^2x and (1-cos^2x)(1+1/tan^2x)= 1 I haven't even gotten 'round to sny of the quedtions because the first one is just so hard. I'm not really sure I...

math
15 percent of 50

acids and alkalis
Pls help me. Pls tell me some bases (alkelis)other than any cleaning products.