Monday
October 20, 2014

Posts by luca


Total # Posts: 16

Chemistry
Please help me! I don't know how to do this at all. Calculate the enthalpy for the reaction: NO (g) + O (g) → NO2 Given the following known reactions: NO(g)+O3 (g)→NO2 (g)+O2 (g) 03 (g)→1.5O2 (g) O2 (g)→2O(g) ΔH°=-198.9kJ ΔH°=-142....
September 27, 2014

math
Write the number of permutations in factorial form. Then simplify. J K L M N O P 7! 720 8! 40,320 7! 49 7! 5,040 I think it is d.
May 27, 2014

math
A company assigns a number to each member by choosing 8 digits between 4 and 8 inclusively. How many possible membership numbers are there?
March 9, 2014

calc
Sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Draw a typical approximating rectangle. y = x^3 − 10x, y = 6x
November 26, 2012

calc
sketch the region enclosed by the given curves. Decide whether to integrate with respect to x or y. Draw a typical approximating rectangle. y = 2x + 1, y = 13 − x^2, x = −1, x = 2
November 26, 2012

Physics
I'll post the link to the figure once Jiskha okays the url.
June 22, 2012

Physics
A mobile consists of two very lightweight rods of length l = 0.400 m connected to each other and the ceiling by vertical strings. (Neglect the masses of the rods and strings.) Three objects are suspended by strings from the rods. The masses of objects 1 and 3 are m1 = 5.90 kg ...
June 22, 2012

maths
how do i solve 2 and 5 over 8 dived into 1 and 3 over 4 times 3and 1 over 3
May 16, 2011

Science
Dear drwls, Thank you soo much for your help! Now I understand how to solve them :) thank you!
January 9, 2009

Science
Do you know how big the Sun is? The Sun is 400 times as big as the Moon and 400 times as far away. The Moon: 2.5mm diameter a) How big would the Sun be if the Moon were the size shown above? b) The Sun is actually about 865,000 miles in diameter, so 1 cm of the model ...
January 9, 2009

science
Do you know how big the Sun is? The Sun is 400 times as big as the Moon and 400 times as far away. The Moon: 2.5mm diameter a) How big would the Sun be if the Moon were the size shown above? b) The Sun is actually about 865,000 miles in diameter, so 1 cm of the model ...
January 9, 2009

science
sry i will write whole questions: Do you know how big the Sun is? The Sun is 400 times as big as the Moon and 400 times as far away. The Moon: 2.5mm diameter a) How big would the Sun be if the Moon were the size shown above? b) The Sun is actually about 865,000 miles in ...
January 9, 2009

science
1) The moon is about 250,000 miles away from the Earth. To the nearest centimetre, how far would it be from the Earth in our scale model? 2) In this mode, how far away from the Earth would the Sun be?
January 9, 2009

science
The sun is actually about 865000 miles in diameter, so 1cm of the model represents how many miles?
January 9, 2009

math
A and B these 2 companies are fixing a road,A fixes 62% of the road,which is 360 meters more than B fixed.How long is this road? Let X be the road length. a is fixed by company A. b is fixed by company B. a + b = x a - b = 360 a = 0.62 x 2a = x + 360 (from adding the first two...
June 9, 2007

Chemistry
It's impossible
October 22, 2006

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