Part A

Calculate the equilibrium constant at 25 ∘C for the reaction
Ni(s)+2Ag+(aq)→Ni2+(aq)+2Ag(s), if
Ni2+(aq)+2e−→Ni(s), E∘ = -0.26 V,
Al+(aq)+e−→Al(s), E∘ = 0.80 V

Express your answer using one significant figure.

Part B

Calculate the equilibrium constant at 25 ∘C for the reaction
Hg2+2(aq)→Hg(l)+Hg2+(aq)
See Appendix D for standard reduction potentials.

Express your answer using one significant figure.

The position of a particle is given by x = 1/3t3 - 2t2 and y = 1/2t2 - 2t. Positions are in meters and time is in seconds. Complete the following table. θ is the angle between v and a, dv/dt is the rate at which the speed is changing, and R is the radius of the trajectory's tangent circle.

equation editor

Equation Editor

(2) How many different product codes do not contain W? 

equation editor

Equation Editor

(3) How many different product codes contain exactly one V? 

A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound. She finds it to be 0.36 s.

a) How far away is the explosion, in meters, if the air temperature is 18°C (with a velocity constant of v = 331 m/s) and if you neglect the time taken for light to reach the physicist?

b) Calculate the distance, in meters, to the explosion taking the speed of light into account. (Note that this distance is negligibly greater than what you found in part (a).)

I understand the equation to be used is v = vo (sqrt( T/273)) but how was this equation derived?

A defibrillator delivers a jolt of electrical energy to restart a heart that is either stopped or undergoing ventricular defibrillation -- a rapid irregular beating. This energy is supplied by a charged capacitor and applied via paddles placed on a patient's body(one on each side of the heart). Consider a 20.7 μF capacitor charged to 2210 V in a defibrillator and used on a patient. After 9.85×10^-2 seconds the voltage across the defibrillator's paddles drops to 49.6 V.

Find the effective resistance of the body between the defibrillators paddles. Hint: assume the voltage across the paddles is the same as the voltage stored on the capacitor.

The following code searches a text file for definitions and prints them out.

I want to create a function that can be called for the given vector and map. The function will either print the results in reverse order, print results without duplicate definitions, or do both. What is the best approach to make the code less repetitive.

if (find(keyWords.begin(), keyWords.end(), v[0]) != keyWords.end()) {
                       for (auto map_iter = mymap.cbegin(); map_iter != mymap.cend(); ++map_iter) {
                           if (v[0] == map_iter->first) {
                               for (auto vec_iter = map_iter->second.cbegin(); vec_iter != map_iter->second.cend(); ++vec_iter)
                                   cout << " " << wordSearch << " " << *vec_iter << endl;
                           }
                       }

How is technology changing interpersonal relationship in our contemporary society? Think of cell phones, blackberries, Ipads, Ipods, etc. Do you think these changes are good or bad, or good and bad? Explain Is there any indication that technology is making our lives better? Could it be that earlier, simpler societies such as hunting and gathering societies, were superior than our own in terms of human relationships? Watch these videos. Share what you learned. https://www.youtube.com/watch?v=fTGKUwMegZ4 https://www.youtube.com/watch?v=4M0iojAIfU0&spfreload=10

A two-dimensional transient velocity field is given by

u = ax(b + ct)               v = ey(f+ ht)

where u is the x velocity component and v, the y component. Find:

1. The trajectory x(t), y(t) if x = x0, y = y0 at t = 0.
2. The streamline that passes through x0, y0 when t=0 and plot it.
3. The acceleration field.

a (-) = 5

b (1/s) = 5

c (m) = -1

e (-) = 5

f (1/s) = 5

h (m) = 4

x₀ = 1

y₀ = 2

consider a spacecraft in an elliptical orbit around the earth. At the low point, or perigee, of its orbit, it is 300 km above the earth's surface; at the high point or apogee, it is 2500 km above the earth's surface.

Part A: find ratio of the spacecraft's speed at perigee to its speed at apogee?

(V_perigee / V_{apogee) = .....}

Part B: find the speed at the apogee?

V apogee = ........ m/s

Part C: find speed at perigee?

V perigee = ..... m/s

(I only have 1 try left in mastering please help me thanks)

A fluid with constant viscosity and density flows in radial direction from R₁ radius surface to R₂ radius surface in the annular region, which consists of porous horizontal cylinders with coaxial R₂ (outer) and R₁ (inner) radii. (V = V (r)).

Make your simplifications using the continuity equation and motion equations by specifying your required assumptions.

Since the fluid is incompressible and is in laminar flow, obtain the steady pressure profile P(r) in terms of velocity in the outer radius v_r(R₂) and pressure P(R₂) in the outer radius.