Posts by Coach

Total # Posts: 11

1. chemistry

Suppose that 50mL of a solution of sulfuric acid of unknown concentration was titrated with a 0.100M solution of sodium hydroxide. If it took 45.5 mL of titrant to reach the equivalence point, what was the concentration of the unknown solution of sulfuric acid???
2. math HELP

When a ball is thrown in the air, the height h of a ball in feet t seconds after the ball is thrown in the air, is given by the equation height = 25t–16t² Use the quadratic equation to determine how many seconds goes by before the ball hits the ground?
3. algebra

When a ball is thrown in the air, the height h of a ball in feet t seconds after the ball is thrown in the air, is given by the equation height = 25t–16t² Use the quadratic equation to determine how many seconds goes by before the ball hits the ground?
4. algebra

When a ball is thrown in the air, the height h of a ball in feet t seconds after the ball is thrown in the air, is given by the equation height = 25t–16t² Use the quadratic equation to determine how many seconds goes by before the ball hits the ground?
5. algebra

47-9x=119 -9x=72 -9x/-9=119/-9 x=-8
6. algebra

How far can you see to the horizon from a mountain top that has a height of 9000 m? Use the formula V= 3.5 sqrt h
7. algebra

How far can you see to the horizon from a mountain top that has a height of 9000 m? Use the formula V= 3.5 sqrt h
8. algebra

If a car leaves a skid mark of 500 feet, how fast was the car traveling? Using the formula r=2ã5L
9. algebra

Simplify by removing the factor of 1 5y -20 / 5y
10. math

A rectangle measures 30 feet by 20 feet and has a post at each corner. If posts are placed 2 feet apart. How many posts will there be in all?
11. physics

In the photoelectric effect, does brightness or frequency determine the Kinetic energy of the ejected electrons? Which determines the number of the ejected electrons?