Question Solved1 Answer 4.28. Air flows at a mean velocity of 1.5 m/s between flat plates that can be assumed to be at a uniform temperature of 40°C. The plates have a length of 20 cm in the direction of air flow and are wide in the other direction and the gap between the plates is 4 mm. The initial air temperature is 20°C and the flow can be assumed to have a uniform velocity at the inlet to the system. Can the flow between the plates be assumed to be fully developed? Evaluate the air properties at a temperature of 30°C.

a certain body at 20 C is display on a top of a building during the night. the body sees nothing but the sky which has effective temperature of 110 k. determine the heat transfer rate from the body to the sky if the body temperature is maintained at 23 C. the surface to the sky emissivity of the body is equal to 0.92

9. Your company share is quoted in the Addis Exchanges at Br 40. The company pays adividendof Br5 per shareandthemarketexpectsa growthrateof7.5%per year: a) Computethecompany'sequitycostofcapital. b) Iftheanticipatedgrowthrateis 10%, calculate the indicatedmark etpricepershare. c) If the company's cost of capital is 15% and the anticipated growth rate is 9. Your company share is quoted in the Addis Exchanges at Br 40. The company pays adividendof Br5 per shareandthemarketexpectsa growthrateof7.5%per year: a) Computethecompany'sequitycostofcapital. b) Iftheanticipatedgrowthrateis 10%, calculate the indicatedmark etpricepershare. c) If the company's cost of capital is 15% and the anticipated growth rate is 10%, calculate the indicated market price assuming Br 5 dividend per share is to bemaintained

13. An LC circuit containing a 70.0 mH inductor and a 3.00 nF capacitor oscillates with a maximum current of 0.500 A. Calculate: a. (5 points) the maximum charge of the capacitor b. (5 points) the oscillation frequency of the circuit. c. (10 points) assuming the capacitor had its maximum charge at time t 0, calculate the energy stored in the inductor after 13. An LC circuit containing a 70.0 mH inductor and a 3.00 nF capacitor oscillates with a maximum current of 0.500 A. Calculate: a. (5 points) the maximum charge of the capacitor b. (5 points) the oscillation frequency of the circuit. c. (10 points) assuming the capacitor had its maximum charge at time t 0, calculate the energy stored in the inductor after 3.00 ms of oscillation.

2. A machine produces electrical components. 99.7% of the components have lengths between 1.176 cm and 1.224 cm. Assuming this data is normally distributed, what are the mean and standard deviation?

A point charge q = +39.0 μC moves from A to B separated by a distance d = 0.171 m in the presence of an external electric field E with arrow of magnitude 300 N/C directed toward the right as in the following figure. 4. +-22 points SerCP11 16 P.006 My Notes Ask Your Teacher a distance d -0.171 m in the presence of an external electric field E of magnitude 300 N/C directed toward the right as in A point charge q = +39.0 μC moves from A to B separated by the following figure. (a) Find the electric force exerted on the charge magnitude direction --Select b)Find the work done by the electric force (c) Find the change in the electric potential energy of the charge (d) Find the potential difference between A and B Need Help? Read It [A point charge g = +39.0 1iC moves from A to B separated by a distance d = 0.171 min the presence of an external electric feld E of magnitude 300 N/C directed toward the right as in the following figure. E ——>}- A B (2) Find the electric force exerted on the charge. magnitude " direction Select (0) Find the work done by the electric force. a (©) Find the change in the electric poter 2 ‘energy of the charge. (¢) Find the potential difference between A ang 8. Va- Vz v Necd Help? a 

2) Create a maths problem and model solution corresponding to the following question: "Find the directional derivative of the following two-variable function for the supplied point and unit vector" Evaluate the directional derivative at the point (2, 5). Ensure that your supplied function uses both x and y, has 3 terms, and that at least one of those terms 2) Create a maths problem and model solution corresponding to the following question: "Find the directional derivative of the following two-variable function for the supplied point and unit vector" Evaluate the directional derivative at the point (2, 5). Ensure that your supplied function uses both x and y, has 3 terms, and that at least one of those terms contains √x. You may choose the vector representing the direction you will evaluate the directional derivative in, and the derivative must be a multiple of √2.