# Posts by GeorgeK

Total # Posts: 8

chemistry
An isotope that emits alpha and beta radiation in addition to gamma rays, would cause much more internal cellular damage, even if its half life and intensity were similar to that of Tc-99.

Chemistry
You are asking for the value of two heats of solution that you should get by doing an experiment, real or simulated. Do that experiment following the instructions you were given. To get an idea of the values you should expect, do a search with a search phrase such as "...

Intergated chemistry/physics
1) Momentum = (150lb+30lb)(20mi/hr) = _______lb*hrs 2) Find half of the above answer 3) momentum = mass x velocity, or p = mv Substitute the value of p from step 2 and 30lbs for the mass of the dog in the above equation. Solve for V. Please note: The unit of momentum here is 1...

Chemistry
1. Divide 10.1g MgBr2 by the fomrula mass of MgBr2 to get the moles 2. Substitute the value for moles and molarity into: moles = molarity x liters Solve for liters and then convert the liters to milliliters.

Chemistry
(1) Convert 0.041 milligrams to grams (divide by 1000) (2) Find the formula mass of C20H24O2 to get the grams per mole. (3) Divide the answer to step #1 by the grams/mole

chemistry
15.00% = 0.1500 Multiply 24.88 grams by 0.1500

Intergated chemistry/physics
acceleration = (Change in velocity) / (time in hours) 4sec / (3600sec/hr) = 0.0011111 hour accel = (99.2km/hr) / (0.0011111 hr)=89286km/hr^2

Intergated chemistry/physics
V(final) = V(initial) + accel x time Vf = Vi + at Solving for t, t = (Vf-Vi)/a t = (27.0m/s-5.0m/s) / 2.5m/s^2 = 8.8 seconds