# Posts by Lianne

Total # Posts: 16

**Maths / Physics (uni level)**

Say I have a centre of rotation at C(x, y, 1 <= z <= 1.5). I need to define a unit normal vector to this. I know it's a length of 1 and this means there's a sphere of radius 1 at the origin so I can get the beginnings of a spherical coordinate system, but I'm...

**maths**

a) 2/5ths of the pupils are wearing spectacles. b) 2/5 = 0.4. 1/5 = 0.2. So you can tell, 0.2 is half of 0.4, meaning 1/5th is half of 16, meaning 8. You can then multiply 8 by 5 to get 40 - the number of students in the class.

**Math**

A rocket shoots straight up from the launch-pad. Five seconds after lift-off, an observer 2 miles away notes that the rocket's angle of elevation is 3.5 degrees. Four seconds later the angle of elevation is 41 degrees. How far did the rocket rise during those 4 seconds.

**Physics**

A 10 kg block sits on a flat surface whose μs=0.60 and whose μk is 0.40 a. What horizontal force is required to get the block move? b.If we continue to apply the same force as in part a. what will the blocks acceleration be? In the answer: force=.6*mg to move net ...

**Physics**

in the answer : force=.6*mg to move net force=ma first force-.6mg=ma solve for a what is the first force??... should i subtract it to .6mg? thanks.

**Physics**

A 10 kg block sits on a flat surface whose μs is 0.60 and whose μk is 0.40 a. What horizontal force is required to get the block move? b.If we continue to apply the same force as in part (a) what will the blocks acceleration be???

**college math**

Suppose $400 is invested for 4 years at a nominal yearly interest rate that is compounded monthly, further suppose it accumulates to 817.39 after 4 years. Find the annual nominal interest rate of the investment.

**college math**

Suppose $400 is invested for 4 years at a nominal yearly interest rate that is compounded monthly, further suppose it accumulates to 817.39 after 4 years. Find the annual nominal interest rate of the investment.

**chemistry final-urgent**

Choose the element with the highest ionization energy element: Na, Mg, Al, P, S In my book: ionization energy increase from left to right and bottom to top. Na<Mg<Al<P<S S is highest ionization energy? my instructor review this problem and his answer is P is a ...

**chemistry final-urgent**

electron configuration of Cr3+? I think is Cr: [Ar] 4s1,3d5 but how about Cr+, Cr2+, Cr3+? Please explain?

**chemistry urgent**

what volume in liters of gaseous hydrogen chloride can be prepared from 40.0 liters of hydrogen with an exces of chlorine? all volumes are measured at STP: H + Cl -> HCl

**chemistry urgent**

given the reaction: 2 Al + 3 H2SO4 -> Al2(SO4)3 + 3 H2 what volume of H2 gas measured at STP will be produced from 5.4 grams of AL reacting with an excess of H2SO4?

**chemistry**

if C6H12O6 -> 2 C2H5OH + 2 CO2 represents the fermentation of sugar to produce alcohol, and the reaction is only 40.0% efficient (% yield), what is the actual yield of alcohol from 454 g of C6H12O6

**population genetics**

In a population where 8% of the men are red-green colour blind, what are the expected proportions of genotypes for the males and females? (Assume the trait does not affect survival or fertility.)

**Biology**

In a population where 8% of the men are red-green colour blind, what are the expected proportions of genotypes for the males and females? (Assume the trait does not affect survival or fertility.) can anyone help me with this? Im stuck :(

**PLEASE SOLVE MY RIDDLE**

I come out in daylight but not in sun I make humans run and run I have two sisters who are in power my mother is a natural flower some say I am old but I feel like new I stick to the bottom of your shoe

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