Air at a dry bulb temperature of 40C and a wet bulb temperature of 20C is first heated in a heater to a dry bulb temperature of 90C. Then it is passed through a bed of apricot slices to dry them. The air existing from the bed is at a dry bulb temperature of 60 C. It is then passed through a dehumidifier to reduce its relative humidity to 10%. Clearly show the various paths of the process on a psychrometric chart. Determine (a) the amount of moisture removed from the bed per kg of dry air (b) the amount of moisture removed in the dehumidifier per kg of dry air.

Air at a dry bulb temperature of 40C and a wet bulb temperature of 20C is first heated in a heater to a dry bulb temperature of 90C. Then it…

Continue Reading Air at a dry bulb temperature of 40C and a wet bulb temperature of 20C is first heated in a heater to a dry bulb temperature of 90C. Then it is passed through a bed of apricot slices to dry them. The air existing from the bed is at a dry bulb temperature of 60 C. It is then passed through a dehumidifier to reduce its relative humidity to 10%. Clearly show the various paths of the process on a psychrometric chart. Determine (a) the amount of moisture removed from the bed per kg of dry air (b) the amount of moisture removed in the dehumidifier per kg of dry air.

A tetrahedron is a solid with four vertices, P, Q, R, and S, and four triangular faces, as shown in the figure. Let V1, v2, v3, and v4 be vectors with lengths equal to the areas of the faces opposite the vertices P, Q, R, and S. respectively, and directions perpendicular to the respective faces and pointing outward. Show that V1 + V2 + V3 + v4 = 0 The volume V of a tetrahedron is one-third the distance from a vertex to the opposite face, times the area of that face. (a) Find a formula for the volume of a tetrahedron m terms of the coordinates of its vertices P. p, R._and S. (b) Find the volume of the tetrahedron whose vertices are/'(l, 1, 1), Q(1, 2, 3), r(1, 1, 2), and S(3, -1, 2). 3. Suppose the tetrahedron in the figure has a trifecta angular vertex 5. (This means that the three angles at S are all right angles.) Let A, B, and C be the areas of the three faces that meet at S, and let D be the area of the opposite face PQR. Using the result of Problem 1. or otherwise, show that D^2 = A^2 + B: -+- C^2 (This is a three-dimensional version of the Pythagorean Theorem.)

A tetrahedron is a solid with four vertices, P, Q, R, and S, and four triangular faces, as shown in the figure. Let V1, v2, v3, and v4 be vectors…

Continue Reading A tetrahedron is a solid with four vertices, P, Q, R, and S, and four triangular faces, as shown in the figure. Let V1, v2, v3, and v4 be vectors with lengths equal to the areas of the faces opposite the vertices P, Q, R, and S. respectively, and directions perpendicular to the respective faces and pointing outward. Show that V1 + V2 + V3 + v4 = 0 The volume V of a tetrahedron is one-third the distance from a vertex to the opposite face, times the area of that face. (a) Find a formula for the volume of a tetrahedron m terms of the coordinates of its vertices P. p, R._and S. (b) Find the volume of the tetrahedron whose vertices are/'(l, 1, 1), Q(1, 2, 3), r(1, 1, 2), and S(3, -1, 2). 3. Suppose the tetrahedron in the figure has a trifecta angular vertex 5. (This means that the three angles at S are all right angles.) Let A, B, and C be the areas of the three faces that meet at S, and let D be the area of the opposite face PQR. Using the result of Problem 1. or otherwise, show that D^2 = A^2 + B: -+- C^2 (This is a three-dimensional version of the Pythagorean Theorem.)

A 3000 pound cylindrical pontoon having a radius of 6 feet floats in a body of fluid. A driver exerts a harmonic force of magnitude 500 lb at a rate of 200 cycles per minute at the center of the upper surface of the float as indicated. (a) Determine the density of the fluid if the pontoon is observed to bob with an amplitude of 1 foot. (b) What is the magnitude of the bobbing motion of the pontoon when the excitation frequency is reduced to 5 rad/sec?

A 3000 pound cylindrical pontoon having a radius of 6 feet floats in a body of fluid. A driver exerts a harmonic force of magnitude 500 lb at a rate…

Continue Reading A 3000 pound cylindrical pontoon having a radius of 6 feet floats in a body of fluid. A driver exerts a harmonic force of magnitude 500 lb at a rate of 200 cycles per minute at the center of the upper surface of the float as indicated. (a) Determine the density of the fluid if the pontoon is observed to bob with an amplitude of 1 foot. (b) What is the magnitude of the bobbing motion of the pontoon when the excitation frequency is reduced to 5 rad/sec?

20. A hydraulic jump occurs in a horizontal storm sewer. The sewer is circular with diameter 1.2 m. Before the jump, the water depth is 06 and just after the jump the sewer is full with a gage pressure of 7 kPa the top. Estimate the flow rate.[Answer: 3.86 m/s] at

A hydraulic jump occurs in a horizontal storm sewer. The sewer is circular with diameter 1.2 m. Before the jump, the water depth is 06 and just after the jump…

Continue Reading 20. A hydraulic jump occurs in a horizontal storm sewer. The sewer is circular with diameter 1.2 m. Before the jump, the water depth is 06 and just after the jump the sewer is full with a gage pressure of 7 kPa the top. Estimate the flow rate.[Answer: 3.86 m/s] at

Tikal National Park in Guatemala is heavily visited by tourists. Does the disturbance affect animal densities? To investigate, Hidinger (1996) compared the densities of various bird and mammal species in places immediately next to heavily visited ruins to places in the park that were rarely visited by tourists. The mean densities (in animals/km^2) are found in the accompanying table. The table also lists the P-value associated with a test of the null hypothesis that the two types of plots do not differ in mean density. Assume that α = 0.05. Name ONE species from that table that shows a significant increase in density near heavily visited ruins? For the spider monkey, does it appear to be a higher mean density near ruins? (yes or no) Is it a significant difference? (yes or no) The species column represent what type of data? (nominal, ordinal, ratio or interval) Mean density represents what type of data? (nominal, ordinal, ratio or interval) Is it discrete or continuous? (discrete or continuous) What kind of graph would be the best way to display this data? (scatter plot, line graph, bar graph, histogram, heat map)

Tikal National Park in Guatemala is heavily visited by tourists. Does the disturbance affect animal densities? To investigate, Hidinger (1996) compared the densities of various bird and mammal species in…

Continue Reading Tikal National Park in Guatemala is heavily visited by tourists. Does the disturbance affect animal densities? To investigate, Hidinger (1996) compared the densities of various bird and mammal species in places immediately next to heavily visited ruins to places in the park that were rarely visited by tourists. The mean densities (in animals/km^2) are found in the accompanying table. The table also lists the P-value associated with a test of the null hypothesis that the two types of plots do not differ in mean density. Assume that α = 0.05. Name ONE species from that table that shows a significant increase in density near heavily visited ruins? For the spider monkey, does it appear to be a higher mean density near ruins? (yes or no) Is it a significant difference? (yes or no) The species column represent what type of data? (nominal, ordinal, ratio or interval) Mean density represents what type of data? (nominal, ordinal, ratio or interval) Is it discrete or continuous? (discrete or continuous) What kind of graph would be the best way to display this data? (scatter plot, line graph, bar graph, histogram, heat map)

Two similar charges are placed at a distance 2b apart. Find, approximately,the minimum radius a of a grounded conducting sphere placed midway between them that would neutralize their mutual repulsion.

Two similar charges are placed at a distance 2b apart. Find, approximately,the minimum radius a of a grounded conducting sphere placed midway between them that would neutralize their mutual repulsion.…

Continue Reading Two similar charges are placed at a distance 2b apart. Find, approximately,the minimum radius a of a grounded conducting sphere placed midway between them that would neutralize their mutual repulsion.

ENGR3S0-Spring 2018 HW#1 Due Friday January 12, 2018 (beginning of class on engineering paper) 1. Draw a FBD of the jib crane AB, which is pin connected at A and supported by member (link) BC Determine the reaction in member BC 0.4 2. A simply supported beam is shown below. a. Draw a proper FBD of the beam showing all the known and unknown forces acting on it. b. Determine the support reactions at A and B c. Draw the shear (V) and bending moment (M) diagrams for the beam. 2500b 500 Draw a proper FBD of member ABC showing all the known and unknown forces acting on it. a. Determine the magnitude of the pin force at A b. Determine the magnitude of the pin force at B c. Bonus: Determine the magnitude of the pin force at D. 3. 9 00 b See other side or next page for typical problem solving technique

ENGR3S0-Spring 2018 HW#1 Due Friday January 12, 2018 (beginning of class on engineering paper) 1. Draw a FBD of the jib crane AB, which is pin connected at A and…

Continue Reading ENGR3S0-Spring 2018 HW#1 Due Friday January 12, 2018 (beginning of class on engineering paper) 1. Draw a FBD of the jib crane AB, which is pin connected at A and supported by member (link) BC Determine the reaction in member BC 0.4 2. A simply supported beam is shown below. a. Draw a proper FBD of the beam showing all the known and unknown forces acting on it. b. Determine the support reactions at A and B c. Draw the shear (V) and bending moment (M) diagrams for the beam. 2500b 500 Draw a proper FBD of member ABC showing all the known and unknown forces acting on it. a. Determine the magnitude of the pin force at A b. Determine the magnitude of the pin force at B c. Bonus: Determine the magnitude of the pin force at D. 3. 9 00 b See other side or next page for typical problem solving technique

Problem 2. Assume we consider the survival of whales and that if the number of whales falls below a minimum survival level m, the species will become extinct. As- sume also that the population is limited by the carrying capacity M of the environment. That is, if the whale population is above M, then it will experi- ence a decline because the environment can not sustain that high population level. Q1. Discuss the following model for the whale population dP dt = k(M-P)(P-m) Where P(t) denotes the whales population at time t and k is a positive proportionality constant. Q2. Graph dP/dt versus P and P versus t. Consider the cases in which the initial population P(0-Po satisfies P)

Problem 2. Assume we consider the survival of whales and that if the number of whales falls below a minimum survival level m, the species will become extinct. As- sume…

Continue Reading Problem 2. Assume we consider the survival of whales and that if the number of whales falls below a minimum survival level m, the species will become extinct. As- sume also that the population is limited by the carrying capacity M of the environment. That is, if the whale population is above M, then it will experi- ence a decline because the environment can not sustain that high population level. Q1. Discuss the following model for the whale population dP dt = k(M-P)(P-m) Where P(t) denotes the whales population at time t and k is a positive proportionality constant. Q2. Graph dP/dt versus P and P versus t. Consider the cases in which the initial population P(0-Po satisfies P)