Friday
December 6, 2013

Posts by haley

Total # Posts: 357

Physical education
JOIN YOUR SCHOOL'S CROSS COUNTRY TEAM! You'll be running A LOT everyday. I promise you you'll get stronger, healthier, and running will be easy!

Math
ok i don't need help anymore disregard this question

Math
Prove algebraically that the line joining the midpoints of the nonparallel sides of a trapezoid is parallel to the bases of the trapezoid.

Describle the following cellular structures and functions?

Health
i got d

Science
A certain isotope has a half-life of 12 hrs. How long will it take for 100 ƒÝgr to decay into only 25 ƒÝgr?

chemistry
How many moles of ammonium ions are in 5.393 g of ammonium carbonate?

Chemistry
The element Niobium (Z=41) is a transitional metal. It has two valences 3+ and 5+. Using an orbital filling diagram, predict the order in which electrons will leave their orbitals in order to achieve those valences (i.e. the first ___ electron will come out of the ___ orbital).

physics
An archer puts a 0.26-kg arrow to the bow-string. An average force of 200 N is exerted to draw the string back 1.4 m. (a) Assuming no frictional loss, with what speed does the arrow leave the bow? m/s (b) If the arrow is shot straight up, how high does it rise? m I got 47 for ...

physics
A 15.0-kg test rocket is fired vertically from Cape Canaveral. Its fuel gives it a kinetic energy of 1961 J by the time the rocket motor burns all the fuel. What additional height will the rocket rise? m - how do you organize this? how do the J's fit in?

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