biology help help me plz
The amount of solar energy falling on the surface of the sea in the English Channel is 1.2 × 106 kJ m−2 y−1. Photosynthetic phytoplankton in the water assimilate energy from sunlight to generate a gross primary production (GPP) of 6.3 × 103 kJ m−2...
chemistry
i have some question but i can not post it ,what should i do .help
chem
how many moles of Na are there in 1.50 moles of NaCl ?
chemistry help
sulfuric acid is a strong acid and dissociates in water as shown in reaction H2SO4(aq)=2H^+(aq)+SO4^2-(aq) what is the hydrogen ion concentration, in mol dm^-3,when 1.50g of sulfuric acid is dissolved in water to give 0.500dm^3 of solution ?show all of your working and give yo...
PHISIC help
A bouncy rubber ball is dropped from a height of about a metre above the ground .it falls to the ground, bounces and then rises back to almost the height from which it was dropped. Describe the main energy transformations that take place from the point at which the ball first ...
Science need help
Astronomers believe that the biggest stars in the Galaxy may be a hundred times more massive than the Sun, but are a million times brighter. Would you expect such stars to have longer, shorter or comparable lifetimes to that of the Sun?
Math
It's right because 5x5x5=125 and 125x2=250
Measurement
Can anayone tell me something that is 65 mm long or wide?
Calculus
1. Does the limit limx-->0:6[[x]] exist? 2. Does the limit limx-->3[[x]] exist? [[x]] is less or equal to x.
chem
What is the entropy change to the surroundings when 1 mol of ice melts in someone’s hand if the hand temperature is 32°C? Assume a final temperature for the water of 0°C. The heat of fusion of ice is 6.01 kJ/mol. a. –188 J/K d. b. –22.0 J/K c. –19.7...
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