A concentration cell is built based on the following half reactions by using two pieces of copper as electrodes, two Cu2+ solutions, 0.145 M and 0.405 M, and all other materials needed for a galvanic cell. What will the potential of this cell be when the cathode concentration of Cu2+ has changed by 0.031 M at 279 K? Cu2+ + 2 e- → Cu Eo = 0.341 V

Two circular plates each of radius R are separated by a distance of b. The space between the plates is filled with a fluid. The upper plate moves downward at a constant rate V resulting in fluid being squeezed out between the plates. Determine the mass flow rate and maximum velocity under the following conditions: a) The exit velocity is uniform; b). The exit velocity is parabolic.

You connect an 8.00 MΩ resistor in a series with a 4.70μF capacitor and a battery with emf 9.00 V. Before you close the switch at t=0 to complete the circuit, the capacitor is uncharged.

1. Find the final charge

2. Find the Initial current

3. Find the time constant

4. How long does it take for the capac8to acquire half the final charge?

Indicate the net charge for the peptide, C-H-A-V-E-C-A-R-R-I-S-T-H-E-G-R-E-A-T-E-S-T, at the given pH values:

(a) pH 1, net charge:

(b) pH 5, net charge:

(c) pH 8, net charge:

(d) pH 14, net charge:

Q4. State the conditions under which a body must travel if it is to move with simple harmonic motion. An object of mass 2kg moves with simple harmonic motion with a frequency of 1.5Hz and amplitude of 200mm. Find: i) The max. velocity ii) The velocity at 100mm iii) The max. acceleration iv) The acceleration at 100mm v) The max. restoring force vi) The restoring force at 100mm

You find a sample of silicon, but the accompanying data sheet has been partially destroyed so you only know that it is n-type, its resistivity is 100 Ohm-cm, and its electron mobility is 1600 cm²/V-s. You also remember that n_i (Si) = 10¹⁰ cm ^-3 .

ii) What is the approximate equilibrium hole concentration, p_o, in this sample?

An LC circuit is built with a 10 mH inductor and an 12.0 pF capacitor. The capacitor voltage has its maximum value of 40 V at t=0s.

Part A

How long is it until the capacitor is first fully discharged?

Express your answer with the appropriate units. (t=?)

Part B

What is the inductor current at that time?

Express your answer with the appropriate units.(I=?)

An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm², separated by a distance of 2.00 mm.

(a) If a 16.0 V potential difference is applied to these plates, calculate the electric field between the plates.
kv/m
(b) What is the surface charge density?
nC/m²
(c) What is the capacitance?
pF
(d) Find the charge on each plate.
pC

Topic: Research Methods

Question:

Impact of social media on teenagers;

Required;

Chapter One
1.Introduction
I. Statement of the problem
II. Objectives of the study
III.Research questions/Hypothesis
IV. Significance of the study
V. Scope of study
VI. Organisation of the study

Nb: please the solution should be as that of a reseach.

It should follow the standard research paper guidelines.

Thank you.

1. A block of mass m is sliding on a horizontal surface. The kinetic coefficient of friction between the block and the surface is µ_k. The drag force is linear with speed (F_D = −ℓv, where ℓ is a constant). The initial velocity of the block is v₀.

(e) Find x(t)

(f) Graph v(t)

(g) Graph x(t)

(h) Describe your solution in words.