Saturday
October 25, 2014

Posts by 4611star


Total # Posts: 18

maths
the length of a rectangle is twice its width, the area is 72sq inches,find its dimensions(find length and width)
August 2, 2012

maths
find two even integers(numbers) so that the square of the smaller is 10 more than the larger one
August 2, 2012

maths
what is the quadratic equation?
March 2, 2012

physics! HELP!
A filament lamp- cost- 80p effiency- 0.2 expected life- 1000 hours a compact fluorescent lamp (CFL)- cost- £3.00 effiency- 0.8 expected life- 8000 hours a filament lamp with a power rating of 100W gives 2000 units of light. what power rating would a CFL need to provide ...
February 29, 2012

chemistry
which of the following are non- polluting: renewable sources coal nuclear fuels or oil?
February 29, 2012

physics
1A) A filament lamp- cost- 80p effiency- 0.2 expected life- 1000 hours a compact fluorescent lamp (CFL)- cost- £3.00 effiency- 0.8 expected life- 8000 hours a filament lamp with a power rating of 100W gives 2000 units of light. what power rating would a CFL need to ...
February 29, 2012

maths
prove that (n-1) squared + n + (n+1)squared = 3n +2
February 19, 2012

maths
prove that 2 2 2 2 (n-1) + n + (n+1) = 3n +2
February 19, 2012

chemistry
what is mantle dynamics?
February 4, 2012

physics
for energy
February 4, 2012

physics
what is the efficiency equation?
February 4, 2012

physics
a 50kg brick bounces with 98% efficiency when droped from a 10 meter ledge. 1.how much energy does it have at the top of the bounce? 2.how high will it bounce?
January 31, 2012

physics
why can't a machine be 100% efficient?
January 29, 2012

physics
a hairdryer turns 250J of electrical energy into 50J of heated air. how efficient is this machine and how much is wasted to sound?
January 29, 2012

physics
a kettle turns 1000j electric energy into 350j of heated water. what is its efficiency? where is the other energy 'wasted' to?
January 29, 2012

algebra
4x-15/2=1/2 2*1/2=1 4x-15=1 4x=1+15 4x= 16 x= 16/4 x= 4
January 29, 2012

physics
ehy can't a machine be 100% efficient?
January 29, 2012

english
why is certification and censorship of films and programmes is necessary? - include children are immpressionable and my copy what they see - children are weak minded - shocks elderly
January 29, 2012

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