CoreanJesus
1. The problem statement, all variables and given/known
A karate expert breaks a pine board, 2.2 cm thick, with a hand chop. Strobe
photography shows that his hand, whose mass may be taken as 580 g, strikes the
top of the board with a speed of 9.5 m/s and comes to rest 2.8 cm below this level.
(a) Calculate the time duration of the chop (assuming a constant force). (b)
Calculate the average force applied.
Velocity position accel. equation and F=ma
So I know the answer and I've solved it. But I don't understand for part a why you would use just .028m instead of .022+.028 for the delta y in your velocity accel. Poston function.[/B]
A karate expert breaks a pine board, 2.2 cm thick, with a hand chop. Strobe
photography shows that his hand, whose mass may be taken as 580 g, strikes the
top of the board with a speed of 9.5 m/s and comes to rest 2.8 cm below this level.
(a) Calculate the time duration of the chop (assuming a constant force). (b)
Calculate the average force applied.
Homework Equations
Velocity position accel. equation and F=ma
The Attempt at a Solution
So I know the answer and I've solved it. But I don't understand for part a why you would use just .028m instead of .022+.028 for the delta y in your velocity accel. Poston function.[/B]