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Briefly define endocrine glands and give one functional difference between the endocrine and nervous system. State the importance of the hypothalamus in neuroendocrine control and give two examples of hormones released from the pituitary. (10%).( thanks)
1. Calculate the magnitude and direction of the electric field 0.50m from a +8.23^-9C point charge.
2. An electric field dipole consists of two equal but unlike charges separated by a distance. Two point charges, q1=+2.3×10^-6C and q2=3.4×10^-6, are separated by 8.9×10^-2m, forming an electric dipole. Find the electric field halfway between the dipole.
A 10.00‐g sample containing an analyte is transferred to a 250‐mL volumetric flask and diluted to volume. When a 10.00 mL aliquot of the resulting solution is diluted to 25.00 mL it gives signal of 0.235 (arbitrary units). A second 10.00‐mL portion of the solution is spiked with 10.00 mL of a 1.00‐ppm standard solution of the analyte and diluted to 25.00 mL. The signal for the spiked sample is 0.502. (a) Calculate the weight percent (%w/w) of analyte in the original sample. (7) (b) What calibration method was used here? Explain your answer.
Chloroform is an internal standard in the determination of the pesticide DDT in a polarographic analysis in which each compound is reduced at an electrode surface. A mixture containing 0.500 mM chloroform and 0.800 mM DDT gave signals of 15.3 µA for chloroform and 10.1 µA for DDT. An unknown solution (10.0 mL) containing DDT was placed in a 100‐mL volumetric flask and 10.2 µL of chloroform (FM 119.39 g/mol, density = 1.484 g/mL) were added. After dilution to the mark with solvent, polarographic signals of 29.4 and 8.7 µA were observed for the chloroform and DDT, respectively. (a) Identify the analyte, the technique and the type of signal used. (3) (b) Find the concentration of DDT in the unknown.
What was the effect of the addition of FeCl3 to the sample solution in the dichromate titration? Explain
> Find the mean of the population
> Find the mean of the sampling distribution of the
sample means
> find the Variance of the population
> find the Variance of the sampling distribution of the
sample mean
> find the Standard deviation of the population
> find the Standard deviation of the sampling
distribution of the sample mean
STUDENT
A
B
C
D
E
HEIGHT (IN CM)
120
130
110
125
159
Calculate the percentage Fe2+ in the salt based on: a) The dichromate titration. b) The permanganate titration using the colour change end point.
- Compute for the amount of charge (q) of a 15 V battery with -45 J potential energy
- A metal sphere has 5x10^-9C static charge. Compute the voltage if the radius is equal to 0.05m. (k=8.99 x 10^9 N.m^2/C^2
- Find the Total capacitance of the three given capacitors in series connection, given their individual capacitances, 4.0 μF, 15.0 μF.
- Find the net capacitance of the three given capacitors connected in parallel, given their individual capacitances, 2.0 μF, 5.0, μF, 8.0 μF.
- A parallel plate capacitor was placed 0.002 m apart. Compute for the capacitance if the area each plate is equal to 0.025 m^2. (ε0 = 8.85x10^-12 F/m)
with computations :) thank you
Find 7-bit right to left even parity hamming code for the BCD of (BF)16
Discuss five technologies applied in water resources development and/or Environmental Management.
