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Malibu 10 Light Outdoor Aged Brass Pro Style Light Kit |  |
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US $170.00 | 2h 4m |
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Wall Mount Solar Spot Light Ultra Bright 4 LED Set 12 | |
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US $140.00 | 4h 3m |
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10GU10 4X1W LED Down Spot Light Warm White 45° 230V 4W | |
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US $128.00 | 4h 6m |
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Mystical Tibet Dzi Bead q62 | |
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US $280.00 | 4h 9m |
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Mystical Tibet Dzi Bead q63 | |
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US $350.00 | 4h 11m |
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Mystical Tibet Dzi Bead q64 | |
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US $300.00 | 4h 12m |
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Mystical Tibet Dzi Bead Tibetan word bead n90 | |
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US $120.00 | 4h 17m |
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Mystical Tibet Dzi Bead Weird rare 16 particles bead q39 | |
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US $300.00 | 4h 19m |
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Mystical Tibet Dzi Bead Sheep angle superstar bead s7 | |
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US $100.00 | 4h 21m |
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Mystical Tibet Dzi Bead Sky eye bead q52 | |
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US $150.00 | 4h 26m |
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Mystical Tibet Dzi Bead Bang sa beadz24 | |
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US $150.00 | 4h 29m |
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Mystical Tibet Dzi Bead Bang beadz28 | |
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US $100.00 | 4h 31m |
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Citizen Eco Drive Chronograph Mens Watch AT0851 07E | |
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US $238.00 | 7h 20m |
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Citizen Eco Drive Chronograph Sport Watch AT0851 15A | |
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US $228.00 | 7h 39m |
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SOLEXX CONSERVATORY GREENHOUSE 8FTX16FT | |
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US $4,024.00 | 9h 5m |
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High Intensity Solar LED Spot light for pond landscape water garden submersible | |
0 Bid | US $198.75 | 9h 21m |
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Solar power Desktop Solar powered Metal Bicycle Rider | |
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US $139.99 | 9h 25m |
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Solar power Wooden Solar powered Wind Turbine 14 Inches Tall | |
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US $119.99 | 9h 25m |
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Solar power Aluminum Solar powered Wind Turbine 19 Inches Tall | |
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US $199.99 | 9h 25m |
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72 Planted Aquarium T5 HO Hood w Splashguard 3 x 80w | |
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US $274.99 | 10h 30m |
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8 Outdoor Garden Solar Stone Rock Spot Light 3 LED | |
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US $164.99 | 12h 23m |
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4 x Outdoor Garden Solar Stone Rock Spot Light 3 LED | |
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US $136.99 | 12h 25m |
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THE VENTURES 16 TITLES 170 TRACKS 12 CD SEALED SET | |
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US $449.99 | 12h 30m |
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10 3x1W E27 230V Studio Home Led Spot Light Bulb3E22 s | |
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US $163.00 | 16h 52m |
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101Wx3 GU10 Studio Red Green Blue Spot Light Bulb3G22 s | |
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US $163.00 | 16h 54m |
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12 Pack Solar Stainless Steel Landscape Adjustable Spot Light with 3 LEDs | |
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US $126.97 | 19h 1m |
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40 x White 38 LED Spot Track Light Bulb 110V AC GU10 | |
0 Bid | US $229.00 | 19h 9m |
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101Wx3 MR16 Studio Red Green Blue Spot Light Bulb3M22 s | |
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US $163.00 | 19h 12m |
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20 x White LED Spot MR16 Light Bulb 110V AC E26 Base | |
0 Bid | US $107.00 | 19h 12m |
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100 x White 38 LED Spot Track Light Bulb 110V AC GU10 | |
0 Bid | US $535.00 | 19h 37m |
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103W 110V 240V Garden Home White Led Screw light158 | |
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US $168.00 | 19h 43m |
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100E27 Screw UV Purple Led Light Bulb Lamp 230vP220 | |
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US $378.00 | 20h 6m |
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50x 3W Aluminum Screw Studio Spot 230V Stage LightE3S | |
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US $699.00 | 20h 6m |
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60W LED flood light billboard light heavy duty Alum Case 110 220VAC 5700LMS | |
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US $175.00 | 1d 2h 49m |
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Cadillac CTS 2012 CADILLAC CTS V Coupe 2dr Cpe corvette luxury performance | |
US $71,300.00 | 1d 4h 43m |
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Cadillac SRX Premium Coll SRX PREMIUM COLLECTION NAV Low Miles Remote Start CLEAN | |
US $38,000.00 | 1d 5h 43m |
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2000 40 FLEETWOOD AMERICAN EAGLE | |
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US $75,000.00 | 1d 6h 13m |
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Casio G Shock “Men in Rusty Black” Watch GW 200MS 1 | |
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US $438.00 | 1d 6h 53m |
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Casio G Shock Frogman Final Edition Watch GW 200Z 1DR | |
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US $408.00 | 1d 6h 53m |
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CENTER FOR PARALLEL WORLDS ASTRAL TRAVEL PSYCHIC MAGIC | |
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US $15,000.00 | 1d 9h 3m |
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Fairy Solar Powered crystal waterfalls Water Fountain | |
0 Bid | US $179.95 | 1d 10h 37m |
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101Wx3 MR16 Studio Red Green Blue Spot Light Bulb3M22 | |
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US $168.00 | 1d 17h 1m |
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Ford Police Interceptor Police Prep Pkg 2003 Ford Crown Victoria Police Interceptor | |
US $6,295.00 | 1d 18h 1m |
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20x White 38 Pcs LED Spot Track Light Bulb 110V AC E26 | |
0 Bid | US $129.00 | 1d 18h 19m |
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100x White 38 Pcs LED Spot Track Light Bulb 110V AC E26 | |
0 Bid | US $535.00 | 1d 18h 39m |
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40x White 38 Pcs LED Spot Track Light Bulb 110V AC E26 | |
0 Bid | US $229.00 | 1d 18h 41m |
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Silver Grey Mirror Films 60x50 Window Film Tint | |
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US $165.00 | 2d 4h 36m |
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Ford Edge 09 FORD Edge 4dr Sport FWD 22 CHROME WHEELS BLACK LEATHER POWER LIFTGATE | |
US $26,982.00 | 2d 5h 36m |
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8 PACK Solar Wall Mounted Lamp Light Outdoor Spot Floodlight FREE SHIPPING | |
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US $128.90 | 2d 6h 25m |
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RARE 1998 Overland Osphrey custom built by original owner Nascars John Andretti | |
0 Bid | US $40,000.00 | 2d 7h 23m |
Znamya 2 calculation?
The Russian Znamya 2 was a 20-meter wide (flat) mirror, launched in 1992. It was
designed to test the feasibility of illuminating parts of the Earth’s surface by reflecting
sunlight from orbiting mirrors. Znamya 2 was deployed (for a few hours only) near
the space station MIR, orbiting at an altitude of
∼ 390 km.
(a) Calculate what size spot on the Earths surface was illuminated by Znamya 2.
(b) Assuming the mirror was optimally positioned so that it was
∼ perpendicular to
light from the Sun, how much solar energy did it receive per second ?
The Sun is about 1/2 degree wide in the sky, so the cone of light cast by an infinitely small mirror would be 1/2 degree wide or 390km * Tan 0.5 degree = 3.4 kilometer wide spot on the ground. So the 20 meter wide mirror make a spot 3.4 km + 20 meters wide, or 3.42 km wide. The area would be about 9,186,331 square meters, or almost 30,000 times larger in area than the 314 square meters area of the 20 meter mirror (assuming it is round). So the sunlight would be 30,000 times less intense than direct sunlight.
|
Malibu 10 Light Outdoor Aged Brass Pro Style Light Kit | |
|
US $170.00 | 2h 4m |
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Wall Mount Solar Spot Light Ultra Bright 4 LED Set 12 | |
|
US $140.00 | 4h 3m |
|
10GU10 4X1W LED Down Spot Light Warm White 45° 230V 4W | |
|
US $128.00 | 4h 6m |
|
Mystical Tibet Dzi Bead q62 | |
|
US $280.00 | 4h 9m |
|
Mystical Tibet Dzi Bead q63 | |
|
US $350.00 | 4h 10m |
|
Mystical Tibet Dzi Bead q64 | |
|
US $300.00 | 4h 12m |
|
Mystical Tibet Dzi Bead Tibetan word bead n90 | |
|
US $120.00 | 4h 17m |
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Mystical Tibet Dzi Bead Weird rare 16 particles bead q39 | |
|
US $300.00 | 4h 19m |
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Mystical Tibet Dzi Bead Sheep angle superstar bead s7 | |
|
US $100.00 | 4h 20m |
|
Mystical Tibet Dzi Bead Sky eye bead q52 | |
|
US $150.00 | 4h 26m |
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Mystical Tibet Dzi Bead Bang sa beadz24 | |
|
US $150.00 | 4h 29m |
|
Mystical Tibet Dzi Bead Bang beadz28 | |
|
US $100.00 | 4h 31m |
|
Citizen Eco Drive Chronograph Mens Watch AT0851 07E | |
|
US $238.00 | 7h 20m |
|
Citizen Eco Drive Chronograph Sport Watch AT0851 15A | |
|
US $228.00 | 7h 39m |
|
SOLEXX CONSERVATORY GREENHOUSE 8FTX16FT | |
|
US $4,024.00 | 9h 4m |
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High Intensity Solar LED Spot light for pond landscape water garden submersible | |
0 Bid | US $198.75 | 9h 21m |
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Solar power Desktop Solar powered Metal Bicycle Rider | |
|
US $139.99 | 9h 25m |
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Solar power Wooden Solar powered Wind Turbine 14 Inches Tall | |
|
US $119.99 | 9h 25m |
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Solar power Aluminum Solar powered Wind Turbine 19 Inches Tall | |
|
US $199.99 | 9h 25m |
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72 Planted Aquarium T5 HO Hood w Splashguard 3 x 80w | |
|
US $274.99 | 10h 30m |
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8 Outdoor Garden Solar Stone Rock Spot Light 3 LED | |
|
US $164.99 | 12h 23m |
|
4 x Outdoor Garden Solar Stone Rock Spot Light 3 LED | |
|
US $136.99 | 12h 25m |
|
THE VENTURES 16 TITLES 170 TRACKS 12 CD SEALED SET | |
|
US $449.99 | 12h 30m |
|
10 3x1W E27 230V Studio Home Led Spot Light Bulb3E22 s | |
|
US $163.00 | 16h 52m |
|
101Wx3 GU10 Studio Red Green Blue Spot Light Bulb3G22 s | |
|
US $163.00 | 16h 54m |
|
12 Pack Solar Stainless Steel Landscape Adjustable Spot Light with 3 LEDs | |
|
US $126.97 | 19h 1m |
|
40 x White 38 LED Spot Track Light Bulb 110V AC GU10 | |
0 Bid | US $229.00 | 19h 9m |
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101Wx3 MR16 Studio Red Green Blue Spot Light Bulb3M22 s | |
|
US $163.00 | 19h 12m |
|
20 x White LED Spot MR16 Light Bulb 110V AC E26 Base | |
0 Bid | US $107.00 | 19h 12m |
|
100 x White 38 LED Spot Track Light Bulb 110V AC GU10 | |
0 Bid | US $535.00 | 19h 37m |
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103W 110V 240V Garden Home White Led Screw light158 | |
|
US $168.00 | 19h 43m |
|
100E27 Screw UV Purple Led Light Bulb Lamp 230vP220 | |
|
US $378.00 | 20h 6m |
|
50x 3W Aluminum Screw Studio Spot 230V Stage LightE3S | |
|
US $699.00 | 20h 6m |
|
60W LED flood light billboard light heavy duty Alum Case 110 220VAC 5700LMS | |
|
US $175.00 | 1d 2h 49m |
|
Cadillac CTS 2012 CADILLAC CTS V Coupe 2dr Cpe corvette luxury performance | |
US $71,300.00 | 1d 4h 43m |
|
Cadillac SRX Premium Coll SRX PREMIUM COLLECTION NAV Low Miles Remote Start CLEAN | |
US $38,000.00 | 1d 5h 43m |
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2000 40 FLEETWOOD AMERICAN EAGLE | |
|
US $75,000.00 | 1d 6h 13m |
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La Roche Posay Anthelios XL Melt-In Cream SPF 50+ List Price: $55.00 Sale Price: $29.95  |
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Indications: Intolerant skin. Dry skin. Properties: Extreme UVA/UVB protection. - Ultra UVA protection provided by a sunscreen system containing Mexoryl® SX and Mexoryl® XL (patented sunscreen agents) - Fluid and easy to apply... |
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Goal0 14001 3-Watt Estrella Light List Price: $59.99 Sale Price: $34.99 |
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The Estrella 3 is an ultra-portable 3 Watt LED light (~140 lumens) and every outdoor enthusiast's best friend. With its low power draw, you can keep the trail, campsite or tent lit for hours at a time... |
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Schumacher SE-1-12S Fully Automatic Onboard Battery Charger - 1.5 Amps List Price: $49.99 Sale Price: $22.42 |
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The Schumacher SE-1-12S Fully Automatic 1.5-amp Onboard Battery Charger is an AC powered automatic trickle charger / maintainer for use with 12 volt lead-acid batteries. The unit features an automatic charge cycling process that allows charging to turn on and off automatically as is necessary, and its "onboard" design and included hardware makes for easy, convenient mounting adjacent to batteries both inside and away from vehicles... |
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Broan Model 509S 8-Inch Through-Wall Utility Fan with Integral Rotary Switch, 180 CFM, 6.5 Sones List Price: $143.60 Sale Price: $71.36 Used From: $66.99 |
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The Broan/Nautilus 180 cfm direct discharge fan helps eliminate humidity from laundry rooms, tobacco smoke from rec rooms and workshops, or cooking fumes from kitchens. The fan is capable of filtering 180 cubic feet of air per minute at 6... |
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"A-KJB Enterprises" Zhu Zhu Puppies - Zhu Zhu - Soft Plush -Howser Puppy (White with Purple Spots) Sale Price: $15.87 |
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Includes puppy and puppy brush ~~ Soft plush white with purple spots ~~ Makes different unique and whimsical sounds ~~ Requires (2) AAA batteries (batteries are included) ~~ Best suited for children ages 4 and up |
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MAXSA Innovations 40218 Motion-Activated Dual Head LED Security Spotlight List Price: $89.95 Sale Price: Too low to display Used From: $36.03 |
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This Maxsa Dual Head Solar LED Spotlight is an ideal choice for doorways, garages, sheds, porches and more. Each head features 4 bright LEDs that automatically turn on when motion is detected at night... |
