Rock Grinding
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 MT05 05 60 PCS DIAMOND BURR ROCK GRINDING DREMEL TOOL  US $5.50
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 MT05 04 20 PCS DIAMOND BURR ROCK GRINDING DREMEL TOOL US $3.49
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6" X 1 1/2 x 60 Grit Diamond Grinding Lapidary Rock Cabochon Wheel Sale Price: $99.99  |
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High quality nickel electroplated diamond lapidary grinding wheel for rock grinding, cabochon making and general grinding of any material. Will not groove or get out of round like a stone wheel. |
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CAB KING 8" lapidary rock grinding polishing cabochon machine Sale Price: $2,499.99 |
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This is a complete machine. You start out at 80 grit and finish on the polishing pad with cerium oxide at about 30,000 grit 3/4 hp, 110v, 1800 rpm, 60hz motor, A 605 GPH, 110/115 volt pump. A powerful 12 volt, single bayonet lamp... |
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8" X 2" X 100 Grit Sachi Perfect Diamond Grinding Lapidary Rock Cabochon Wheel Sale Price: $169.99 |
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High quality nickel electroplated diamond lapidary grinding wheel for rock grinding, cabochon making and general grinding of any material. Will not groove or get out of round like a stone wheel. |
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8" X 60/80 Grit Sintered Diamond Grinding Lapidary Rock Cabochon Wheel Sale Price: $449.99 |
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High quality sintered diamond lapidary grinding wheel for rock grinding, cabochon making and general grinding of any material. Will not groove or get out of round like a stone wheel. Has about 5 mm thickness of diamond sintered material on the wheel |
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8" X 360 Grit Sintered Diamond Grinding Lapidary Rock Cabochon Wheel Sale Price: $449.99 |
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High quality sintered diamond lapidary grinding wheel for rock grinding, cabochon making and general grinding of any material. Will not groove or get out of round like a stone wheel. Has about 5 mm thickness of diamond sintered material on the wheel |
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DEWALT DW5461 7/8-Inch by 10-Inch by 12-Inch ROCK CARBIDE SDS Plus Hammer Bit List Price: $46.04 Sale Price: $13.00 |
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The DEWALT DW5461 Rock Carbide SDS-plus Hammer Bit handles the toughest masonry with extreme accuracy and speed. The Rock Carbide tip greatly improves the bit life, and the elongated four flute helix design channels debris out of the way more efficiently than other bits... |
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DEWALT DW5400 Rock Carbide SDS+ Hammer Bit, 5/32-Inch by 2-Inch by 4-Inch List Price: $5.67 Sale Price: $8.84 |
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DeWALT DW5400 5/32" X 2" X 4" Rock Carbide SDS+ Hammer BitDEWALT is a leading manufacturer of industrial power tools with more than 300 power tool and equipment products as well as 800 power tool accessories... |
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DEWALT DW5404 3/16-Inch x 6-1/2-Inch x 8-1/2-Inch ROCK CARBIDE SDS Plus Hammer Bit List Price: $8.80 Sale Price: $5.11 |
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DEWALT DW5456 3/4-Inch by 16-Inch by 18-Inch ROCK CARBIDE SDS Plus Hammer Bit List Price: $44.58 Sale Price: $24.49 |
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DEWALT DW5412 7/32-Inch by 8-Inch by 10-Inch Rock Carbide SDS Plus Hammer Bit List Price: $10.57 Sale Price: $5.99 |
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DeWALT DW5412 7/32" X 8" X 10" Rock Carbide SDS+ Hammer BitDEWALT is a leading manufacturer of industrial power tools with more than 300 power tool and equipment products as well as 800 power tool accessories... |
Calculate the horizontal distance from the base of the building to the point where the rock strikes the ground
A man stands on the roof of a building of height 16.3 m and throws a rock with a velocity of magnitude 26.1 at an angle of 25.8m/s above the horizontal. You can ignore air resistance.Calculate the magnitude of the velocity of the rock just before it strikes the ground.
I assume that the angle is 25.8 DEGREES above the horizontal.
The vertical component of the initial velocity is Vup=Sin(25.8)*26.1
The horizontal component of the initial velocity is Vh=Cos(25.8)*26.1
The time that it takes to reach the top of the arc of travel is Tup=V/g
The distance traveled up is Dup=1/2*g*Tup^2
The distance traveled down in Ddown=Dup+16.3
The time taken to travel down is Tdown=sqrt(Ddown/g*2)
The vertical component of the velocity at impact with the ground is Vdown=g*Tdown
The velocity at impact is Vi=sqrt(Vdown^2+Vh^2)
The distance traveled horizontally is Dh=(Tdown+Tup)*Vh
The distance from the base of the building is 83 meters
The velocity at impact is 33.08
