# Posts by Lianne

Total # Posts: 14

**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.

*September 29, 2012*

**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 ...

*August 26, 2012*

**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.

*August 26, 2012*

**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???

*August 26, 2012*

**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.

*October 13, 2011*

**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.

*October 13, 2011*

**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 ...

*December 14, 2010*

**chemistry final-urgent**

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

*December 14, 2010*

**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

*November 30, 2010*

**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?

*November 30, 2010*

**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

*November 30, 2010*

**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.)

*November 13, 2008*

**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 :(

*November 13, 2008*

**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

*December 24, 2006*

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