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2. A TV set, a stove, a flat iron are connected in series to a 220 V line. The resistance of the TV set is 20 ohms, the stove is 50 ohms and the flat iron is 35 ohms. Find the following;
(a) total resistance
(b) the amount of current flowing in each device
(c) the voltage drop across each device
A car is driven west for a distance of 50 km, then north for 30 km, and then in direction 30° east of
north for 25 km. Determine the total displacement of the car from its starting point by drawing the
vector diagram.
A random sample of 11 observations was taken from normal population. The sample mean and standard deviation are 74.5 and 9 accordingly. Can we infer at 5% significance level that the population mean is greater than 70?
A random of 25 observations was drawn from a normal population. The sample mean and the sample standard deviation are 52 and 15 accordingly. Is there enough evidence at 10% significance level to infer that the population mean is not equal to 50? Estimate the population mean as well.
The potential energy of a system of two atoms is given by the expression, 𝐔 = −𝐀 𝐫 𝟑 + 𝐁 𝐫 𝟖 A stable molecule is formed with release of 10 eV of energy when the interatomic distance is 3 A°. Determine the force needed to dissociate this molecule into atoms and the interatomic distance at which the dissociation occurs
Computation:
A 50000 g object accelerates with a force of 500 newtons. Find the acceleration of the object.
Describe the origin and structure of sympathetic and parasympathetic nerves and state three functions of each nerve. (10%- 5 for sympathetic and 5 for parasympathetic). ( short answer please)
50.0 ml of 2.50M Sulfuric acid reacted with 43.5ml 2.75 Aluminum hydroxide. The reaction yielded Aluminum sulfate and water. (Al=27g/mol, S=32g/mol, H=1g/mol, O=16g/mol)
1. Write the balance chemical equation.
2. What is the limiting reactant?
3. How much reactant is in excess?
4. How many grams of Aluminum sulfate will be produced?
A 100-volt electromotive force is applied to an RC series circuit in which the resistance is 200 ohms and the capacitance is 10−4 farad. Find the charge q(t) on the capacitor if q(0) = 0. Find the current i(t).
If 3.2443 moles of carbon dioxide are produced, how many grams of iron (III) oxalate were reacted if the reaction proceeds with a 99.6% yield?
