Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 10

**Physics**

A dentist's chair with a patient in it weighs 2260 N. The output plunger of a hydraulic system begins to lift the chair when the dentist's foot applies a force of 61 N to the input piston. Neglect any height difference between the plunger and the piston. What is the ra...

**Chemistry! Urgent!!**

0.080 m FeCl3 find the boiling point it. so i did ( 0.080)(.51)(4)+100 and i got 100.16 whyy is that wrong?

**math**

Hi, I've been working on this problem: Evaluate the triple integral of xz with the vertices (0,0,0), (0,1,0), (0,1,1), and (1,1,0). I drew out the tetrahedron, but I can't set up the bounds. Usually, they give you an equation as a bound. Here, I'm just completely l...

**math**

Hi, I've been working on this problem: Evaluate the triple integral of xz with the vertices (0,0,0), (0,1,0), (0,1,1), and (1,1,0). I drew out the tetrahedron, but I can't set up the bounds. Usually, they give you an equation as a bound. Here, I'm just completely l...

**calculus**

so would the shape be an cone ?

**calculus**

In spherical coordinates, the inequalities 0≤ρ≤2, 3π/4 ≤ φ ≤ π 0 ≤ θ ≤ 2π, describe what kind of shape? So, the radius is from 0 to 2, and it makes a full circle around the z-axis. But what does 3π/4 ≤...

**Chemistry**

Calculate the percent ionization of cyanic acid, Ka=2.0x10^-4, in a buffer soln that is .50M HCNO and .10M NaCNO. Answer is .20%. So,I know that NaCNO-->Na+ + CNO- so [CNO-]=.10M from ICF chart. and then HCNO <=>H+ + CNO- where: [HCNO]= .5 and [CNO-]=.1 With an ice ta...

**Chemistry**

Sacchirin is a monoprotic acid. If the pH of a 1.50x10^-2M solution of this acid is 5.53, what is the Ka of saccharin? (the answer is 5.8x10^-10) I know we're supposed to use the Henderson Hasselbach equation to solve for the [H+] from pH, but what's next? Thanks Dr. Bob.

**chemistry**

The basicity constant of pyridine can be expressed as pKb = 8.75 what will be the pH of a 1M (1 mole per liter) solution of pyridine in water? Py + HOH ==> PyH^+ + OH^- Kb = (PyH^+)(OH^-)/(Py) Change pKb to Kb, plug in x for (PyH^+) and (OH^-) and 1 for (Py) and solve for x...

**chemistry**

Ethyl acetoacetate is a liquid. The value of the tautomeric constant for neat ethyl acetoacetate is Kt = .079. What is the percentage of the enol form in neat ethyl acetoacetate? please show all the work thanks!

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