Speed Hammer
November 14th, 2008
Speed Hammer
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 Bosch 85 Amp 1 2 in 2 Speed Hammer Drill HD19 2B RT $76.98 Time Remaining: 10d 5h 45m Buy It Now for only: $76.98 |
 Black Decker Two Speed Hammer Drill Type 2 $9.00 Time Remaining: 4h 31m |
 DEWALT 1 2 VSR Single Speed Hammer Drill DW511R $56.98 Time Remaining: 24d 9h 43m Buy It Now for only: $56.98 |
 1 1 2 Electric Rotary Hammer Drill With Bits SDS Plus Roto Tool Variable Speed $69.95 Time Remaining: 10h 54m Buy It Now for only: $69.95 |
 Ryobi 55 Amp 1 2 in 2 Speed Hammer Drill ZRD552HK $46.98 Time Remaining: 10d 4h 3m Buy It Now for only: $46.98 |
 Milwaukee 1 2 in Dual Torque Variable Speed Hammer Drill with Case 5378 81 $96.98 Time Remaining: 21d 17h 48m Buy It Now for only: $96.98 |
 Bosch 1 2 120V Single Speed Hammer Drill 1191VSRK RT $66.98 Time Remaining: 10d 5h 44m Buy It Now for only: $66.98 |
 1 1 2 Electric Rotary Hammer Drill With Bits SDS Plus Roto Tool Variable Speed $68.25 Time Remaining: 7h 21m |
 1 1 2 ELECTRIC ROTARY HAMMER DRILL WITH BITS SDS PLUS ROTO TOOL VARIABLE SPEED $63.49 Time Remaining: 19d 1h 11m Buy It Now for only: $63.49 |
 RYOBI 2 SPEED 1 2 HAMMER DRILL G21 $45.99 Time Remaining: 18d 22h 12m Buy It Now for only: $45.99 |
 NEW 1 2 Prof Variable Speed Reversible Hammer Drill $32.29 Time Remaining: 9h 53m Buy It Now for only: $32.29 |
 Bosch 85 Amp 1 2 in 2 Speed Hammer Drill with Case HD19 2 RT $96.98 Time Remaining: 10d 5h 45m Buy It Now for only: $96.98 |
 Milwaukee 5376 20 1 2 Single Speed Hammer Drill $99.99 Time Remaining: 8d 12h 42m Buy It Now for only: $99.99 |
 Ryobi D550H 1 2 2 Speed Hammer Drill $34.99 Time Remaining: 2d 1h 11m |
 Milwaukee 1 2 in Single Speed Hammer Drill 5376 20 NEW $99.00 Time Remaining: 23d 17h 52m Buy It Now for only: $99.00 |
 1 2 Hammer Drill Model OTMT224 Maximum Free Speed 3000 RPM $21.27 Time Remaining: 10d 22h 39m Buy It Now for only: $21.27 |
 Bosch 92 Amp 1 2 in 2 Speed Hammer Drill HD21 2 NEW $166.98 Time Remaining: 10d 5h 43m Buy It Now for only: $166.98 |
 Milwaukee 1 2 in Dual Speed Hammer Drill 5387 80 $162.40 Time Remaining: 24d 9h 50m Buy It Now for only: $162.40 |
 Bosch HD19 2B 1 2 Inch 2 Speed Hammer Drill w pistol grip Handle NEW $128.99 Time Remaining: 27d 4h 42m Buy It Now for only: $128.99 |
 NEW DeWALT DCD985L2 20v MAX LITHIUM ION 30aH 3 SPEED CORDLESS HAMMER DRILL KIT $100.99 (2 Bids) Time Remaining: 5d 12h 6m |
 750W 1 2 VARIABLE SPEED REVERSIBLE HAMMER DRILL $44.95 Time Remaining: 6d 10h 26m Buy It Now for only: $44.95 |
 Bosch 85 Amp 1 2 in 2 Speed Hammer Drill Tool Only HD19 2B NEW $126.98 Time Remaining: 4d 15h 40m Buy It Now for only: $126.98 |
 Hitachi 3 4 Hammer Drill 68 Amp Variable Speed Rev $129.99 Time Remaining: 10d 3h 38m Buy It Now for only: $129.99 |
 Bosch 85 Amp 1 2 in 2 Speed Hammer Drill with Case HD19 2 NEW $136.98 Time Remaining: 10d 5h 43m Buy It Now for only: $136.98 |
 Milwaukee 1 2 in Dual Speed Hammer Drill with Case 5387 22 NEW $199.99 Time Remaining: 10d 19h 47m Buy It Now for only: $199.99 |
 BOSCH 1 2 HAMMER DRILL 8AMP 2 SPEED MODEL 1194AVSRK $0.01 Time Remaining: 8d 11h 38m Buy It Now for only: $129.99 |
 Bosch 85 Amp 1 2 in 2 Speed Hammer Drill with Dust Collection Unit HD19 2D NEW $200.00 Time Remaining: 5d 5h 39m Buy It Now for only: $200.00 |
 CRAFTSMAN 8 AMP VARIABLE SPEED 1 2 INCH HAMMER DRILL F16 $99.99 Time Remaining: 15d 4h 11m Buy It Now for only: $99.99 |
 1 2 IN HAMMER DRILL VARIABLE SPEED ROTATING ADJUSTABLE $129.99 Time Remaining: 27d 3h 28m Buy It Now for only: $129.99 |
 1 2 Black Decker Variable Speed Compact Hammer Drill $79.99 Time Remaining: 8d 22h 50m Buy It Now for only: $79.99 |
A 30.0-kg hammer strikes a steel spike 2.30 cm in diameter while moving with speed 20.0 m/s. The hammer reboun?
A 30.0-kg hammer strikes a steel spike 2.30 cm in diameter while moving with
speed 20.0 m/s. The hammer rebounds with speed 10.0 m/s after 0.110 s. What
is the average strain in the spike during the impact?
1. Use the two velocities and the time of 0.110 s. to calculate acceleration.
2. Use F = ma to calculate the force.
3. Use stress = force / area to get stress.
4. Take E = stress/ strain and solve this equation for strain.