Problem 2 You are standing 3.4 m from a convex security mirror in a store. You estimate the height of your image to be half of your actual height. Part A Estimate the radius of curvature of the mirror. Follow the sign conventions. Express your answer to one significant figure and include the appropriate units. ☐ ΜΑ T= 6.8 m Submit Previous Answers Request Answer ? × Incorrect; Try Again; 6 attempts remaining Provide Feedback
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- A tentative rule was given about tipping in Testing Experiment Table 8.4, where if a vertical line passing through the object's center of mass is within the object's area of support the object does not tip. According to the rule, the full box of crackers in the following experiment, which has a width of 13 cm and a height of 20 cm, was seen to tip at an angle of: θc=tan−1(13 cm/20 cm)=33∘θ According to the rule, at what angle will a box with the left half filled with crackers begin to tip? Assume the box is light-weight and that the contents remain in the configuration inAssume that annual energy requirement of an industry is 20000 kWh . DETERMINE size of wind turbine that is required to be installed to meet the energy requirement . Following assumptions are taken into account for estimation Annual energy requirement - 20000 kWh Propeller type wind machine is used . Coefficient of performance -0.40 Wind speed at 15 meter height is 5 meter / sec ( if the turbine hub is placed at the height other than 15 meter , the wind speed should be estimated as shown in " vertical wind speed variation section Density of air - 1 kg / m Capacity factor -0.30PROPAGATION OF ERROR You are tasked to supervise the design of 0.5MW wind turbine to be constructed in a Wind Farm in Pililla, Rizal. Suppose the design criteria are as follows: The air density as surveyed after 2 year period averaged at 1.225 kg / cubic meter. The sweeping diameter of the rotor blades is 125m, and the anemometer reading in the area amounts to 4.2m/s on a 2 year period of survey. What is the theoretical power output of the turbine assuming 100% efficiency of operation? Your answer must be in kW and in two decimal places with correct signs. In the previous problem, if the diameter measurement is off by 0.1m and the anemometer reading is also fluctuating by 0.05m/s and if the error measurement for theoretical power output must be limited to 3%, WHY OR WHY NOT should you accept the design? * Show complete solution in paper.
- PROPAGATION OF ERROR You are tasked to supervise the design of 0.5MW wind turbine to be constructed in a Wind Farm in Pililla, Rizal. Suppose the design criteria are as follows: The air density as surveyed after 2 year period averaged at 1.225 kg / cubic meter. The sweeping diameter of the rotor blades is 125m, and the anemometer reading in the area amounts to 4.2m/s on a 2 year period of survey. if the diameter measurement is off by 0.1m and the anemometer reading is also fluctuating by 0.05m/s. In the design specifications given, if the actual measurement of power via the substation amounts to exactly 530kW and given that the windspeed is off by 0.05m/s, what could have been the error in the measurement of diameter? Your answer must be in 3 decimal places and in correct signs and measurement. Show complete solution in paper.Evaluate each of the following and express your answer to a homogeneous unit either English or SI. •50mN + 300GN•62mm + 400ft•32 lbm-ft/s^2 x 2 kgm-m/s^2•100MN/20GN(1) A simple, vertical U-tube manometer is used to measure the differencebetween two gas pressures.Write down an equation for the pressure difference in terms of the difference inthe level of the fluid in the manometer. Describe briefly, with the help ofdiagrams, two modifications to the basic design which offer greater sensitivity tosmall pressure differences. Give equations for their use. ii) An extractor fan draws air from a room and delivers it to the surroundingsthrough a 5m long circular duct of diameter 0.1m. The friction coefficientfor the duct flow is 0.002. The fan characteristic, relating its total pressurerise, ∆P (Nm-2) to the volume flow rate is: ∆P = 103−7x104Q 2. What is therate of flow through the duct?You may assume that the room and surroundings are both at atmosphericpressure; state and justify any other assumptions you make.
- A hemispherical dome of radius 40 feet is to be given 5 coats of paint, each of which is 1/100 inch thick. Use linear approximation to estimate the volume of paint needed for the job.( Hint: Approximate the change in the volume of a hemisphere when the radius increases from 40 feet to 40 feet 5/100 inches. Don't forget to make sure this increased radius is in terms of feet. )It will take approximately cubic feet of paint to apply all 5 coats of paint.In an experiment designed to determine the value of a parameter n, the actual value that is determined during the experiment is ln n which is determined to be ln n = –1.17828±0.07023. What is the value of n? Make sure that you quote the answer to the correct number of significant figures.An engineer sets the pressure in a supply tank usinga very accurate manometer as a guide and then reads theoutput of a 20-psig pressure gauge attached to the tank as10.2 psig. Sometime later she repeats the procedure andobtains values of 10.4 and 10.3 psig. Discuss the following gauge properties:(a)Precision(b)Accuracy(c)Resolution(d)RepeatabilityExpress these answers on a percentage of full-scale basis.
- Completely solve and box the final answers. Write legibly 9. A blower with the inlet open to the atmosphere delivers 250 cubic meters per minute of air at a pressure of 2.50 cm of water gage through a duct 25 cm in diameter, the manometer being attached to the discharge duct at the blower. Air temperature is 25 degrees C and the barometer pressure reads 1.025 bar. Calculate the required motor rating in KW if the blower efficiency is 92.5%A long steel rod is placed horizontally between two supports, one at each end. The rod bends a little in the center. Which property of this rod can be used to estimate how much the rod should bend at the center? 1. Its Shear Modulus 2. Its Young's Modulus 3. All of these Moduli can be used to compute how much it bends. 4. Its Bulk Modulus.Distilled water stands in a glass tube of 9 mm diameter at a height of 24 mm. What is the true static height? Use = 0.0742 N/m.