Social Studies
Near what type of physical feature was most of the earliest farming villages built?
consumer math
The Mannings file a tax return showing $125000 in earned income, $3288 from interest income, and they have a tax credit of 1% of their earned income. They claim 5 exemptions of $2500 each, one head of household exemption of $10500, pre-tax medical deductions of $125 weekly, an...
chemistry
You are given 50 mL of .25 M citric acid. How many moles of NaOH would you need to add to obtain a soln with a pH of 6.7? Assume volume unchanged Ka1=7.4E-4 Ka2=1.7E-5 Ka3=4E-7
Chemistry
work out the [OH-], [H+] and pH of the solution formed when 0.500L of 0.250 M hydrochloric acid solution is mixed with 0.500 L of a 0.250 M calcium hydroxide solution.
Physics
A 20 N force acts on a 10 kg object parallel to the object's displacement. If the force acts for 32 m, what is the final kinetic energy, in J, of the object assuming it starts from rest?
Physics
The work done on an object by the gravitational force is 28 J. What is the change in the gravitational potential energy of the object?
Physics
From your intergalactic survey base, you observe a moon in a circular orbit about a faraway planet. You know the distance to the planet/moon system, and you determine the maximum angle of separation between the two and the period of the moon's orbit. Assuming that the moon...
Physics HELP!
An ant and a beetle are riding a spinning record on a record player. The ant stands on the outside edge of the record while the beetle stands on the record's label. The ant is four times as far from the center of rotation as the beetle. What is the ratio of the ant's c...
Physics help?
Nitrogen gas molecules, which have mass 4.65×10−26 kg, are striking a vertical container wall at a horizontal velocity of positive 440 m/s. 5.00×1021 molecules strike the wall each second. Assume the collisions are perfectly elastic, so each particle rebounds...
Physics
Sam tosses a ball horizontally off a footbridge at 4.3 m/s. How much time passes after he releases it until its speed doubles? Can someone please explain the correct equation to use thoroughly and help me to find the correct answer?!
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