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1. [3.33/20 Points] Shown in the figure below is an electrical circuit containing three resistors and two batteries. R₁ www 4 R3 ww 10 www Write down the Kirchhoff Junction equation and solve it for I, in terms of I, and I. Write the result here: 4-42-13 Write down the Kirchhoff Loop equation for a loop that starts at the lower left corner and follows the perimeter of the circuit diagram dockwise. 0-10-₁ +4 × Write down the Kirchhoff Loop equation for a loop that starts at the lower left corner and touches the components 10V, R₁, 4V, and R₂. 0--12R₂-IR₁ × The resistors in the circuit have the following values: R, 20 R₂ =6 R 100 Solve for all the following (some answers may be negative): I-1.3478 -0.2174 --1.1304 x Amperes x Amperes x Amperes NOTE: For the equations, put in resistances and currents SYMBOLICALLY using variables like R,,R₂,R, and I, J₂,;. Use numerical values of 10 and 4 for the voltages. SUBMIT ANSWER

Q3:A tow truck pulls a car that is stuck in the mud, with a force of 2 500 N as shown. The tow cable is under tension and therefore pulls downward and to the left on the pin at its upper end. The light pin is held in equilibrium by forces exerted by the two bars A and B. Each bar is a strut: that is, each is a bar whose weight is small com-pared to the forces it exerts, and which exerts forces only through hinge pins at its ends. Each strut exerts a force directed parallel to its length. (i) Determine the force of tension or compression in each strut. Proceed as follows: Make a guess as to which way (pushing or pulling) each force acts on the top pin. (4) (ii) Draw a free-body diagram of the pin. Use the condition for equilibrium of the pin to translate the free-body diagram into equations. From the equations calculate the forces exerted by struts A and B. 4A negative answer means the direction should be reversed, but the absolute value correctly gives the magnitude of the force. (8)…

2. Kiran is doing a summer internship in a physics lab that uses optical fibres. Their Thorlabs 1550BHP fibre has specifications listed here. To the right is a diagram of the various layers (thicknesses to scale) and the definition of the bending radius (not to scale). Kiran needs to route a beam of A = 1550 nm light through a tight mechanical setup and needs to keep the curves larger than the listed minimum bend radius (Long Term). Assume that any curves are circular (i.e. the curve makes a perfect circular arc segment) and Coating Cladding Core Cladding Coating that all the light is perfectly aligned when it enters the fibre. Bending Radius a) Draw a diagram of the situation showing the light beams, the core, and core-cladding interface of the fibre. Include a circular bend of the minimum bending radius, and the path of the light beams as they reflect. b) Based on the minimum bending radius, what is the ratio of the indices of refraction of the core and cladding material? I.e. find…

1. Tobenna is visiting the penguin exhibit at a zoo. He sees a penguin swimming underwater, using its beak to look for food at the bottom of the tank. According to a tour guide, the tank is 2.0 m deep. The index of refraction of the water is the usual one of 1.33, and Tobenna is standing right at the edge of the tank. a) Tobenna's excellent depth perception tells him the penguin is 5.3 m away. He has taken PHYS 102 so he knows that this is just an apparent distance. Determine the apparent and actual horizontal distances of the penguin from the edge of the tank. b) If Tobenna crouches down so his head is only 1.0 m above the ground, will he perceive the penguin to be closer or further from the wall than in a)? c) Is there a place where Tobenna could stand where he would not see the penguin at all, despite being able to draw a straight line between his eyes and the penguin? (i.e. due to refraction, not from standing around a corner.) d) This question is qualitative only. You don't need…

Reta 2. The force of gravity between two objects becomes stronger/twice as strong) LAWS OF MOTION 99 if the distance between them is halved. (four times 3. The force of gravity is weaker on the moon than on earth because the moon has less 4. The gravitational force exerted by the earth on an object is called the object's (Analysis) (mass/distance) (Application) (weight/mass) (Understanding) ANSWERS 1. decreases 2. four times stronger 3. mass 4. weight. Numericals Find the gravitational force between two bodies of masses 50 kg each, situated at 1 m from each other. Ans. 1.67 x 107 N. 2. Find the attractive force between moon and earth if mass of earth is 6 x 1024 kg, mass of moon is 7.4 × 1022 kg and moon is at a distance of 3.84 x 108 m from the earth. Ans. 2.01 x 1020 N. 3. How does the gravitational force between two bodies change, if the distance between them is reduced to half? Calculate the value of 'g' at height of 3 times to radius of earth. Ans. 4 times. Ans. g/16. Ans. 60 kg.…

6. [0/5 Points] DETAILS MY NOTES PREVIOUS ANSWERS ASK YOUR TEACHER PRACTICE ANOTHER The emf in the figure below is 4.38 V. The resistances are R₁ = 26.02, R2 = 26.50, and R3 = 38.00. Find the following. R₁ R2 R3 (a) the current in each resistor (Give your answers to at least three significant figures.) 12= 13 = A A A (b) the power consumed by each resistor P1 P₂ = P3 W W W (c) the power supplied by the emf device Enter a number. W Viewing Saved Work Revert to Last Response SUBMIT ANSWER KatzPSE1 29.P.040.

The stators in a gas turbine are designed to increase the kinetic energy of the gas passing through them adiabatically. Air enters a set of these nozzles at 300 psia and 700°F with a velocity of 76 ft/s and exits at 250 psia and 645°F. Calculate the velocity at the exit of the nozzles. The specific heat of air at the average temperature of 672.5°F is cp=0.253 Btu/lbm⋅R . The velocity at the exit of the nozzles is __________ ft/s.

A desktop computer is to be cooled by a fan whose flow rate is 0.34 m³/min. Determine the mass flow rate of air through the fan at an elevation of 3400 m where the air density is 0.7 kg/m³. Also, if the average velocity of air is not to exceed 103 m/min, determine the diameter of the casing of the fan. Air outlet Air inlet Exhaust fan The mass flow rate of air through the fan is The diameter of the casing of the fan is kg/min. cm.