Wednesday
December 11, 2013

Total # Posts: 256

physics
a 40.0 ohm resistor and a 90.0 ohm resistor are connected in parallel, and the combination is connected across a 120 V dc line. A)what is the resistance of the parallel combination. B)what is the total current through the parallel combination. C)what is the current through eac...

physics
a piece of wire has a resistance of R , it is cut into three pieces of equal length,and the pieces are twisted together parallel to each other. what is the resistance of the resulting wire in terms of R

physics
a 500.0 ohm resistor is connected in a series with a capacitor.what must be the capacitance of the capacitor to produce a time constant of 2.00 s

physics
a 1.5 kg box moves back and forth on a horizontal frictionless surface between two different springs. the box is initially pressed against the stronger spring compressing it 4.0 cm , and then is released from rest,A) by how much will the box compress the weaker spring,B) what ...

chemistry
what is the molar concentration of an aqueous NaOH solution when 45.0 grams are dissolved in water to make 100mL of solution

chemistry
Write a net equation for the reaction between aqueous solutions of Na2HPO4 and H2CO3.

Algebra
Without writing them all out, what is the number of subsets of set A = {tongue, ear, mouth, eye, nose, cheek, forehead, neck, shoulder}?

physics
Bumpers on cars are not of much use in a collision. To see why, calculate the average force a bumper would have to exert if it brought a 1200 kg car (a so-called "compact" model) to a rest in 15 cm when the car had an initial speed of 2 m/s (about 4.5 mph). Bumpers ...

Physical Chemistry
For part A, I'm plugging into the Arrhenius equation, ignoring A, and then dividing the 2 rates for each activation energy. I'm getting 1.027 for my particular set of numbers (Ea = 120 & 56) @ 293K. This isn't correct though.

geometry
What is the volume of a cone with a radius of 3 and a height of 19?

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