BLOWGUN: In the Amazon forrest hunters use hand-crafted blowguns with poisoned darts to kill monkkeys. After inserting a dart the hunter points the tube vertically, takes a deep breath then blows. Bingo! Monkey for dinner.
PART II: The event of firing a blowgun was studied with the assumption that there was no frictio. Perform a more accurate analysis. Approximate the friction force of the dart moving in the tube as twice its gravity force. The drag force of the dart moving upward through air is approximated as:
EMBED Equation
EMBED Equation
where "C" is an experimentally determined drag coefficient (C= 1.1), "A" is the frontal projected area of the dart (diadart=0.8cm), rho is the density of the air (1.2kg/m3) and V is the speed of the dart. The masses of the monkey and dart are 1.8 kilograms and 6.2 grams, respectively. Apply the First Law with the data of the figures to calculate:
a) The least work expended by the hunter.
b) The average propulsive pressure of discharge required.
c) If the monkey is hit (with the dart fired as usual) What does the First Law tell us?
MathType
PRINTMAN
MathType
Times New Roman
Times New Roman
Symbol
Symbol
Times New Roman
Times New Roman
"System
Equation
METAFILEPICT
MathType
PRINTMAN
Equation
METAFILEPICT
the monkey is hit (with the dart fired as usual) What does the First Law tell us?
BLOWGUN: In the Amazon forrest hunters use hand-crafted blowguns with poisoned darts to kill monkkeys. After inserting a dart the hunter points the tube vertically, takes a deep breath then blows. Bingo! Monkey for dinner.
PART II: The event of firing a blowgun was studied with the assumption that there was no frictio. Perform a more accurate analysis. Approximate the friction force of the dart moving in the tube as twice its gravity force. The drag force of the dart moving upward through air is approximated as:
EMBED Equation
EMBED Equation
where "C" is an experimentally determined drag coefficient (C= 1.1), "A" is the frontal projected area of the dart (diadart=0.8cm), rho is the density of the air (1.2kg/m3) and V is the speed of the dart. The masses of the monkey and dart are 1.8 kilograms and 6.2 grams, respectively. Apply the First Law with the data of the figures to calculate:
a) The least work expended by the hunter.
b) The average propulsive pressure of discharge required.
c) If the monkey is hit (with the dart fired as usual) What does the First Law tell us?
MathType
PRINTMAN
MathType
Times New Roman
Times New Roman
Symbol
Symbol
Times New Roman
Times New Roman
"System
Equation
METAFILEPICT
MathType
PRINTMAN
Equation
METAFILEPICT
MathType
Times New Roman
Times New Roman
Symbol
Symbol
Times New Roman
Times New Roman
"System