PLEASE JUST STATE 3 ASSUMPTIONS FOR EACH QUESTION .. NO ANSWERS NEEDED JUST 3 AS

Question

PLEASE JUST STATE 3 ASSUMPTIONS FOR EACH QUESTION .. NO ANSWERS NEEDED JUST 3 ASSUMPTIONS FOR (2,3,4 and 5) 2) A 3000 lb car is traveling up at quarter mile long uphill road. The intine of the road is estimated to be 30 (from horizontan, taking the car 50 seconds in total to climb. what will be the power needed to: a. keep the car at a constant velocity, b, if the car starts at rest and reaches afinal velodty of 40m/s. Please note the trig function you are using to determine the height A granting agency must decide between two renewable energy sources: wind or hydro. The proposed wind turbine being considered for construction is in a location where the wind blows t 11 m/s. The proposed turbine has blade diameters of 40m and the air density at this location was measured to be 1.3 kg/m The hydro turbine proposal plans to install a turbine- generator 200 meters below the free surface of a large reservoir. The density of the salt water is to be taken as 1020 with a supply rate of 0.5M a. Which of these two proposals would provide alarger maximum power generation? b. Decide which you think is the best option for the funding agency to grant. 4) One boiler at Brookhaven National Lab's (BNL) steam plant has a rated heat input of 7.5 x 10° Btu/h. The combustion efficiency of the boiler is measured to be roughly 6s%. After srict requirements from the Department of Energy, the lab is forced to conserve energy and therefore needs to tune its boilers more carefully. After some tuning, the boilers efficiency is now 73%. This particular boiler operates for 5600 hours ofthe year. The lab gets a special rate of $5.22 x 10 s/Btu. How much energy and cost savings did this tune up help BNL?lf BNL needed to reduce their cost on fuel by a minimum of S200,000 per year, did this tune up help?

Explanation / Answer

2) assumptions

a. the frictional force is 0

b. air drag force is 0

c. pwer is uniform through out the travel

3) assumptions:

a) wind speed is constant through out the given period

b) the reservior level is constant

c) the air density and the salt density remaoin const.

4) assumptions:

a) the fuel rate is const.

b) the tune up involved no extra cost

c) the increased efficiency remains const for the period under consideration

5) asumptions:

a) assume current oil burned by the home owner is X

b) efficiencies remain const. in both cases over the period of operation

c) the maintainance costs of bothe the systems are same for the period under consideration.

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