How many tons of air conditioning is required per sq. ft. for a commercial (IT) space with a 12-13 foot ceiling height?
In India tonnage and BTU measurement as well as EER are quite different from the West. So to give an idea of how much tonnage your room requires,Calculate Area of your room, Take Sq root and divide the number by 10 to get equivalent tonnage. Eg- L= 13 B=10 so you have V=130 Sq.ft roomSqrt of 130 = 11.4 Divided by 10= 1.1Rounding off you'll need 1.1 ton AC. For a 180 sq.ft room it will be 1.3 Ton but round off to next figure - 1.5 Ton. Generally BTU rating and cooling capacity of AC is much more than required in case of 1 Ton models but that is compensated due to tropical weather in India.
How long does it take an airliner to reach an altitude of 3000 meters?
Each aircraft is different. Air Traffic Control uses ground height to determine departure altitudes, holds and vectors for each departing (and arrival) aircraft. Airports with severe air traffic congestion will often hold aircraft at low altitudes before allowing an unrestricted climb. It could take a while or if it's an off peak departure time, approval to go directly to cruise altitude at maximum airspeed's allowed below 10,000 FEET (ASL) of 250 knots. After 10,000', airspeed can increase to whatever the pilot desires. So it's probably anywhere from 6 to 10 minutes depending on weight and cargo load. A fully loaded B-737 will not climb at 4,000 fpm above 10,000', more like 2,500' fpm. A B-747-400 fully loaded will take some time to get to 10,000', but I don't recall exactly the best rate of climb to that point. I remember once in a jump seat of a B-747-200 to 31,000' took just over half an hour. If the aircraft is empty, wow, look out. B-787 maximum take off performance climb from runway. This is a demonstration only, by some of the best test pilots in the business. Not to be outdone...Airbus A-380 Maximum performance take off. Remember, the aircraft is empty and probably only has enough fuel onboard for 45 minutes.
A car of mass 1500 kg accelerates from rest at 5 m/s2 for 5 s on a straight road. What is the minimum power needed for the engine to achieve the task?
what Sol Infinus, did is correct. But to make sure, here is a longer way of finding the same colutionpower = work done / timeWork done = force x distanceF = ma5 x 1500 = 7500to calculate distance we can use SUVATv = u +at0 + 5 x 5 = 25v^2 = u^2 + 2as25^2 = 0 + 10s625 / 10 = 62.5again. Work done = force x distance7500 x 62.5 = 468750power = work done / time468750 / 5 = 9375wor 93.75KWthat is average power187.5KW for final power is correct for power needed to reach a velocity of 25that is: power = force x velocity 7500 x 25 = 187.5KW
How many employees can be seated in a 1000 Sq. feet office?
Office layout designs should provide an environment suitable for the business needs of the organisation. For example: call centres undertake their business ‘on screen’ and require small desk areas per staff member, minimum document storage, and may have limited requirements for photocopying facilities and printing. In contrast, companies handling paper based documentation will require larger desks for their staff, storage for records, archive facilities, photocopying and printing facilities close to hand.Being specific to your question i am considering an end to end space with an ideal uninterrupted space. For a standard workstation of 4' x 1'6" size and 3' wide for seating and circulation behind it, we allot a 18 sq.ft area for one person. So in 1000 sq.ft you can fit in 55 workstations.Being a bit conservative in the actual site conditions it might go down to 45 nos.But if planning on a real good quality of office you should look into this office in delhiCrystal Corp office interiors by 42mm architecture AlsoOpen plan offices are often divided up into smaller offices for managers, meeting rooms, etc. When this happens the designer has to take into account several factors including:Heating/cooling zoningVentilationLighting and light switches[9]Emergency lightingSmall powerVoice and data cablingFire alarmsFire stoppingFire escape routesNoise/acoustics
How much kg of steel is used in a 1 sq. ft. slab if the spacing is 6" (one-way slab)?
For one way RCC sab of 1 sq.ft area having reinforcement spacing at 6 inch,there will be 3 numbers of both main and distribution bar of each length 1 feet(cover not considered). Quantity of Steel can be calculate as follow:1.Weight of Main bar of dia ‘D’ mm,W1 = 3 x 0.305 x D^2/162 = 0.0056D^2 kg.2. Weight of distribution bar of dia ‘d' mm,W2 = 3 x 0.305 x d^2/162 = 0.0056d^2 kg.Total quantity of Steel(in kg),W =(W1 + W2) Kg.W = 0.0056(D^2 + d^2) kg.
What are the specs and estimated 1/4 mile and 0-60 for a 78 Pontiac TransAm?
Ok heres all the info I have on specs/times for the 78 TA 1978 T/A 400 (W72) - 220 HP and 320 lb/ft torque 1978 Trans Am 403 Power: 185 bhp @ 3600 rpm Torque: 320 lbs-ft @ 2200 rpm 0-60 9.4 seconds Standing 1/4-mile: 16.4 sec @ 80 mph 1978 Carb HP VIN Code Manufacturer 305 2 BC 145 HP U Chevrolet 350 4 BC 170 HP L Chevrolet 400 4 BC 180 HP Z Pontiac 400 4 BC 220 HP Z Pontiac 403 4 BC 185 HP K Oldsmobile the T/A 6.6 had one with an additional 20 degrees of duration. To help finish the cycle, a new low restriction dual reasonator exhaust system was added, replacing the single muffler used on all other Trans Am's. ( The dual splitter tail pipes were also fitted.) To keep the oil pressure from dropping to zero on when turning quickly to the right or left, a windage tray was added. These items were in addition to 1977's compression ratio increase of 8.1:1 (versus 7.6:!) by bolting the 350's cylinder heads on the 400 engine. Just to make sure everyone knew you had a T/A 6.6, the callouts were affixed to the shaker and chrome valve covers completed the look. Although 220 horsepower may seem wimpy compared the the hairy chested Ram Air III's, IV's and and SD-455's, but remember this was power achieved with little valves, low profile cast iron intake's, plain old exhaust manifolds, and the power restrictive catylitic converter. The numbers for the W72 were 220hp @ 4000 rpm and 320 lb/ft of torque peaking a good bit further up the rev range at 2800 rpm than the garden variety 400 The WS6/W72 combination quickly established the 1978 Trans Am as the "King of the Hill", long before there was such a thing a a Corvette ZR-1. Magazines loved the car and the Spring 1978 issue of Road Test magazine squared off a Z28, a Corvette, and a Trans Am in a street fight. The T/A was clearly chosen as the easiest car to drive fast. As a result of the test, it was reported that it took 15.2 seconds to cover the quarter mile, going through the traps at 93.4 mph. It could spring from zero-to-sixty in 7.2 seconds and had a terminal speed of 123 mph, a full 600 rpms over the redline of 5000. In braking, the 3720 pound T/A test car took 149 feet to stop from 60 mph. In a circle, the Trans Am could generate .83g of grip which matched the test Corvette and was well beyond the .76g the Camaro Z28 capable of.
Is it possible to melt metal (Fe, Al, Cu) with a solar oven or a set of optical lenses?
Yes, for the Optical lenses..if you have a large enough gathering field of photons (many square meters) and focus all that light down to a spot/point, you will get crazy high heating loads locally. If the metal sample is small, it will melt.. if not small, it conductively cools to the regions not thermally/solar loaded, so might only melt a little button.Go get an old TV flat screen that has a freznel lense in it (this is pre LCD tv), that is many square feet, focuses down to a small spot.. very hot!A solar oven will heat a larger volume to a lesser temperature, not sure if you can melt a higher melting point metal that way, would need some serious insulation and large light gathering region.