Saturday
May 25, 2013

# Posts by Brooke

Total # Posts: 528

physics
A dad pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 16 rpm in 11.5 s. Assume the merry-go-round is a uniform disk of radius 3.0 m and has a mass of 790 kg, and two children (each with a mass of 25 kg) sit opp...

physics
An 85 kg football player traveling 4.7 m/s is stopped in 1.0 s by a tackler. What is the original kinetic energy of the player? (I tried using 1/2 m v^2 but that doesn't seem to be right. How do I manipulate the formula?) What average power is required to stop him?

Chemisty
Write all possible quilibrium equations for KHP dissovled in water and then write the quilibrium constanst expressions for the equation.

Psysics (Magnetism)
A current-carrying wire is placed in a uniform magnetic field, but there is no magnetic force on it. How is this possible?

physics
An alpha particle (charge = +2.0e) is sent at high speed toward a gold nucleus (charge = +79e). What is the electric force acting on the alpha particle when the alpha particle is 1.7 multiplied by 10-14 m from the gold nucleus? N

physics
At the point of fission, a nucleus of 235U that has 92 protons is divided into two smaller spheres, each of which has 46 protons and a radius of 5.08 multiplied by 10-15 m. What is the magnitude of the repulsive force pushing these two spheres apart?

physics
Calculate the net charge on a substance consisting of a combination of 4.3 multiplied by 1013 protons and 2.5 multiplied by 1013 electrons.

US History
Got a question: On our class we have to write a research paper tracing the historical causation of a current event and the current event has to be with in a year! Can someone help me with suggestions?

chem pH
calculate the pH when 10 mL of .511 M sodium acetate and 20.00 mL of 0.350 M acetic acid

Pages: <<Prev | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | Next>>