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Steel Irons

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CALLAWAY BIG BERTHA WARBIRD 10 DRIVER STEEL LH    US $.99

TAYLORMADE 200 SINGLE 3 IRON LITE S 90 GRAPHITE STIFF    US $2.47

COBRA FP 2008 SINGLE 6 IRON ALDILA VS PROTO HL 70 GRAPHITE STIFF    US $3.25

PING I10 SINGLE BLACK DOT 7 IRON AWT NO CUSHIN] STEEL STIFF    US $15.10

Callaway X 20 Single 8 Iron LEFT HANDED    US $29.95

TaylorMade Burner 20 Iron set Golf Club    US $549.99

NEW NIKE SQ MACHSPEED IRONS GRAPHITE SENIOR A FLEX 4 AW FACTORY SEALED    US $143.55

TITLEIST VOKEY SPIN MILLED BLACK NICKEL 2009 56 SAND WEDGE STEEL    US $35.06

TITLEIST 695CB FORGED SINGLE 5 IRON DYNAMIC GOLD X100 STEEL X STIFF LH 1    US $5.84

TAYLORMADE R7 TI 15 3 WOOD RE AX 60 BY FUJIKURA GRAPHITE REGULAR    US $49.00

CALLAWAY X TOUR 2008 13 STRONG 3 WOOD GRAPHITE STIFF    US $28.05

MIZUNO MP 63 IRONS 3 PW 8PC TRUE TEMPER DYNAMIC GOLD S300 STEEL STIFF    US $393.26

RARE NIKE SQ STRONG 13 DEGREE 3 WOOD LK    US $35.00

Ping i3 Blade Iron Set 3 W Black Dot Matching Serial Numbers 1 Day Auction NR    US $113.50

COBRA PRO CB SINGLE 6 IRON TRUE TEMPER DYNAMIC GOLD S300 STEEL STIFF    US $5.50

Ping i3 O Size Iron Set 4 PW Left Handed with Ping 350 Series Graphite Shaft    US $96.00

Cleveland CG16 Tour Black Pearl Iron set Golf Club 3 PW Stiff    US $255.00

BRAND NEW MENS TOUR LOGIC 15 PC RIGHT HANDED GOLF CLUB SET WITH BAG COVERS    US $88.99

Ping ISI S Iron Set 3 W Matching Serial Numbers Non Matching Dots 1 inch    US $82.00

New Japan Epron 2012 JPZ Gold Plated 56789PW Graphite Irons Golf Club Set    US $33.90

Titleist Cameron Studio Style Newport 2 Putter Golf Club NEW    US $200.00

Cleveland CG16 Black Pearl Wedge Golf Clubs Wedge Set 50 54 58    US $104.49

Nike Ignite 15 3 Wood right handed stiff flex    US $15.99

Callaway Steelhead X 16 Irons 3 W Uniflex Shafts and Callaway Grips    US $66.00

Ping Eye 2 Iron Set Orange Dot 2 thru W 1 Day Auction and No Reserve $099 Start    US $81.00

Ping i15 Iron set Golf Club    US $299.00

Nice Titleist DCI 962 SW Sand Wedge True Temper S300 Stiff Flex Mens RH    US $29.95

King Cobra SS 7 Wood    US $15.00

New Cobra S2 Gap Wedge 49 Steel Regular    US $45.00

New Adams Golf 2011 Speedline F11 3 Fairway Wood 16 Ladies    US $59.00

CONFIDENCE GOLF POWER ll MENS RH HYBRID GOLF CLUB FULL SET STAND BAG NEW    US $98.87

CONFIDENCE GOLF POWER ll TEENAGER RH HYBRID GOLF CLUB FULL SET STAND BAG NEW    US $95.87

CUSTOM PING I10 IRONS 1 2 AWT Stiff White Dot 4 PW    US $375.00

New Callaway RAZR X Tour Hybrid 21 degree stiff    US $90.00

MATCHED SET TaylorMade Rescue MID Fairway Woods 3 19 AND 5 23 PINK    US $44.99

Cobra S2 S3 335 Shaft Sleeve Adaptor New SS Screw Ferrule Also Fits Cobra ZL    US $31.00

Titleist PT 906F4 Fairway Wood 185 Degree    US $49.99

Titleist Vokey Spin Milled Tour Chrome 2009 5208 5611 and 6207 Wedges    US $119.99

Taylormade R11 3 Pw Steel Iron Regular    US $550.00

TaylorMade Supersteel Burner 2002 Golf Iron Set    US $125.00

Taylormade LCG Irons 3 PW SW S 90 RH 95 Driver 5 and Rescue    US $175.00

Taylormade R9 Approach Wedge KBS90 Steel Reguar Mint Free shipment    US $59.99

Mizuno MP 52 Iron set    US $275.00

TaylorMade Burner Plus Iron Set Golf Clubs 4 AW Mitsubichi Rayon Graphite Shaft    US $202.50

Callaway RAZR X Iron set 4 SW Uniflex Steel    US $350.00

Mizuno JPX 800 Pro Iron set Golf Club RH Stiff Flex Steel 4 GW    US $475.00

TITLEIST 904F Fairway Wood Golf Club 22 DEGREE LEFT HANDED    US $45.00

Titleist 909H Hybrid Golf Club 17 X Stiff Graphite    US $160.00

Titleist 909H Hybrid Golf Club 21 X Stiff Graphite    US $160.00

Mizuno MP 63 Iron Set 4 P MP 53 3 iron    US $349.00

Football

What radius (in mm) must a steel (iron) ball bearing have if it is to have a mass of 1.25g?

What radius (in mm) must a steel (iron) ball bearing have if it is to have a mass of 1.25g?
V = 4/3(pi)r^3
Density of Iron = 7.7874
Mass = 1.25
Volume = .1605

Mass = 1.25g = 0.00125kg
Density = 7787.4 kg/m3
V= mass / density = 1.605e-7m3

V = 4/3(pi)r^3 = 1.605e-7 m3
r^3 = ( 1.605e-7 * (3/4) ) / pi
= 3.83 e-8 m3
r = Cubed root of 3.83 e-8
= 3.37e-3 m *1000 = 3.37mm (i find it easier working in metres)