# 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)

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

maths
what is the quadratic equation?

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 ...

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

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 ...

maths
prove that (n-1) squared + n + (n+1)squared = 3n +2

maths
prove that 2 2 2 2 (n-1) + n + (n+1) = 3n +2

chemistry
what is mantle dynamics?

physics
for energy

physics
what is the efficiency equation?

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?

physics
why can't a machine be 100% efficient?

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?

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

algebra
4x-15/2=1/2 2*1/2=1 4x-15=1 4x=1+15 4x= 16 x= 16/4 x= 4

physics
ehy can't a machine be 100% efficient?

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