Which of the following(s) affects the composition of the optimal risky portfolio?

I. Expected returns of assets

II. Standard deviations of assets

III. Risk-aversion

IV. Correlation among assets

V. Risk-free rate

A voltaic cell is constructed that uses the following reaction and operates at 298 K. Zn(s) + Ni2+(aq) Zn2+(aq) + Ni(s) (a)

What is the emf of this cell under standard conditions?______ V

(b) What is the emf of this cell when [Ni2+] = 2.24 M and [Zn2+] = 0.112 M?_____ V

(c) What is the emf of the cell when [Ni2+] = 0.298 M and [Zn2+] = 0.925 M?____ V

A concentration cell based on the following half reaction at 312 k ag+ + e- --------> ag srp = 0.80 v has initial concentrations of 1.25 m ag+, 0.221 m ag+, and a potential of 0.04865 v at these conditions. after 8.3 hours, the new potential of the cell is found to be 0.01323 v. what is the concentration of ag+ at the cathode at this new potential? Please explain all the steps used to find the answer.

Standard copper potential = 0.339 V

% Error = [100 – (Theoretical/Experimental)] x 100

Please help me complete the table above.

Suppose that a parallel-plate capacitor has circular plates with radius R = 28 mm and a plate separation of 5.5 mm. Suppose also that a sinusoidal potential difference with a maximum value of 140 V and a frequency of 77 Hz is applied across the plates; that is,

V = (140 V) sin[2π(77 Hz)t].

Find B_max(R), the maximum value of the induced magnetic field that occurs at r = R.

Many different ways have been proposed to make batteries. One cell is set up with copper and lead electrodes in contact with CuSO4(aq) and Pb(NO3)2 (aq), respectively. If the Pb2+ and Cu2+ concentrations are each 1.0 M, what is the overall cell potential?

Pb2+ + 2e- ---> Pb E = -0.22 V

Cu2+ + 2e- ----> Cu E = +0.34 V

answer: 0.56 V. how?

Some enzymes are inhibited by high concentratins of their own substrates. (a) show that when substrate inhibition is important the reaction rate v is given by

v= Vmax/ ( 1+km/[S}o + [S]o/K1

Where Ka is the equilibrium constant for dissociation of the inhibited enzyme substrate complex. (b) What effect does the substrate inhibition have on a plot of 1/v against 1/[S]o?

A room with 2.7-m-high ceilings has a metal plate on the floor with V = 0V and a separate metal plate on the ceiling. A 1.5 g glass ball charged to 5.0 nC is shot straight up at 4.7 m/s .

How high does the ball go if the ceiling voltage is 2.9×10⁶ V ?

How high does the ball go if the ceiling voltage is −2.9×10⁶ V ?

The following table gives the mean velocity of planets in their orbits versus their mean distance from the sun. Note that 1 AU (astronomical unit) is the mean distance from Earth to the sun, about 93 million miles.

Astronomers tell us that it is reasonable to model these data with a power function.

(a)

Use power regression to express velocity as a power function of distance from the sun. (Round regression parameters to two decimal places.)

v = 29.73 × d^0.50

v = 21.41 × d^−0.50

v = 29.73 × d^−0.73

v = 29.73 × d^−0.50

v = 21.41 × d^−0.29

(b)

Plot the data along with the regression equation.

(c)

An asteroid orbits at a mean distance of 3 AU from the sun. According to the power model you found in part (a), what is the mean orbital velocity of the asteroid? (Round your answer to two decimal places.)

_______ km/sec