December 8th, 2009 
admin Heavy Resistance
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 Resistance Fitness Exercise X Heavy Band Tube Manual  US $10.97
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 SPRI Xertube Heavy Resistance Band Value$1500 US $6.00
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 Pilates Yoga Resistance Exercise Band Heavy Grade 3 US $6.40
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 THERA BAND THERABAND 6 FT GOLD HEAVY RESISTANCE BAND US $11.95
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 Gorilla Strength Ultra Heavy Resistance Band Home Gym US $75.00
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 HEAVY RESISTANCE GRIPMASTER HAND FINGER WRIST EXERCISER US $12.37
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 HEAVY RESISTANCE EXERCISE BAND TONING TUBE PILATES CORD US $12.27
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 HEAVY SET of Black AND Blue Resistance Bands Tube P90X US $12.75
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 SPRI Xertube Resistance Band w Door Attach Blue Heavy US $13.99
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 Pilates Yoga Resistance Exercise Band X Heavy Grade 4 US $6.86
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 VALEO RESISTANCE TUBE HEAVY band fitness cord exercise US $11.50
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 NEW Heavy 15lbs Blue Resistance Band Tube P90X US $7.00
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 Ultra Heavy Resistance Band Home Gym System 7 358lbs US $75.00
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 RESISTANCE EXERCISE BAND EXTRA HEAVY Tubing Pilates US $9.50
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 Gorilla Strength Heavy Resistance Band Home Gym Tubes US $55.00
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 DYNA BAND 6ft Exercise Purple Heavy Resistance DynaBand US $9.95
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 Pilates Yoga Resistance Exercise Band XX Heavy Grade 5 US $7.31
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 Pilates Yoga Resistance Exercise Band Heavy Handles US $10.06
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 HEAVY RESISTANCE GRIP HAND FOREARM FINGER EXERCISE NEW US $12.57
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 TKO RESISTANCE CORD HEAVY tubing exercise band fitness US $21.50
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 NEW Extra Heavy 25lbs Black Resistance Band Tube P90X US $9.00
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 Resistance Fitness Exercise Heavy Band Tube Manual US $10.51
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 2pcs Extra Heavy 25lbs Black Resistance Band Tube P90X US $16.00
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 Black Resistance Band Extra Heavy Level Great for P90X US $9.99
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 NEW GRIP HAND FINGER EXERCISE SYSTEM HEAVY RESISTANCE US $11.07
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 Thera Band Professional Resistance Band Loops Theraband US $9.45
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 EXERCISE RESISTANCE BAND MEDIUM HEAVY Tubing Pilates US $8.99
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 IRON BODY Resistance Band Light Medium or Heavy US $9.99
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 HEAVY GRIPS HAND GRIPPERS 200 lbs of resistance US $14.95
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 Theraband Heavy Resistance Tubing 2 Pack US $14.30
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 Baseball Xertube Heavy Rubber Resistance Strengthen Arm US $24.95
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 Gym Resistance Bands Exercise Fitness Rope NEW US $8.86
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 Pilates Yoga Resistance Exercise Band XX Heavy Handles US $10.97
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 HEAVY GRIPS HAND GRIPPERS 150 lbs of resistance US $14.95
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 HEAVY GRIPS HAND GRIPPERS 100 lbs of resistance US $14.95
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 Heavy Level Resistance Band for P90X Slim in 6 Pilates US $10.99
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 RESISTANCE EXERCISE BAND MEDIUM HEAVY Tubing Pilates US $8.99
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 Resistance Tube with Foam Grips Heavy Resistance US $7.50
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 Resistance Tube with Foam Grips Extra Heavy Resistance US $7.16
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 Pilates Yoga Resistance Exercise Band X Heavy Handles US $10.51
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A shiny coin was thrown from the window, too heavy for the air resistance to affect its motion?
A crow chick (mass 500g) noticed the shiny coin, and rushed after the falling coin. Due the lack of flight skills, the chick failed to catch the coin, which remained just 1 inch from his beak for several seconds.
What net force was excerted on the air by the chick during the pursuit?
Net force is 0.
There are 3 main components of external forces acting on chick: gravity, friction, propelling force. Both friction and propelling force are forces acting on a chick from different portions of air in different directions but nevertheless they are forces from air to chick. According to 3rd law of Newton chick exerts on air the net force that is similar by value but opposite in direction. So let's try to find the value of netforce from friction and propelling.
Because chick's acceleration is g, it means that netforce of 3 external forces is equal to gravity, so the sum of the other two forces is 0. But this is the net force exerting by air on chick, so the net force exerting by chik on air is also 0.
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