H h_g Member Joined Jul 24, 2014 Messages 32 Location My room Gender Male HSC N/A Dec 12, 2014 #1 a package is to be dropped from a plane flying at a height of 300m to a base on ground. If the plane is flying at 75ms-1, calculate the distance before the base, that the package must be released in order to reach the base.
a package is to be dropped from a plane flying at a height of 300m to a base on ground. If the plane is flying at 75ms-1, calculate the distance before the base, that the package must be released in order to reach the base.
P photastic Well-Known Member Joined Feb 11, 2013 Messages 1,848 Gender Male HSC 2014 Dec 12, 2014 #2 Ux = 75m/s Uy = 0m/s Consider downwards positive ay = 9.8m/s/s , Sy = 300 Sy = Uyt + ½ayt^2 300 = 0 + 4.9t^2 t = square root (300/4.9) Sx = Uxt Sx = 75 x square root (300/4.9) Therefore distance = 587m Edit: Fizzy Last edited: Dec 13, 2014
Ux = 75m/s Uy = 0m/s Consider downwards positive ay = 9.8m/s/s , Sy = 300 Sy = Uyt + ½ayt^2 300 = 0 + 4.9t^2 t = square root (300/4.9) Sx = Uxt Sx = 75 x square root (300/4.9) Therefore distance = 587m Edit: Fizzy
Fizzy_Cyst Well-Known Member Joined Jan 14, 2011 Messages 1,200 Location Parramatta, NSW Gender Male HSC 2001 Uni Grad 2005 Dec 13, 2014 #3 aarondapho said: Ux = 75m/s Uy = 0m/s Consider downwards positive ay = 9.8m/s/s , Sy = 300 Sy = Uyt + ½ayt 300 = 0 + 4.9t t = 300/4.9 Sx = Uxt Sx = 75 x 300/4.9 Therefore distance = 4592m Click to expand... you forgot to square the t in your equation! Sx = 75 x sqrt(300/4.9) Sx = 586.85m
aarondapho said: Ux = 75m/s Uy = 0m/s Consider downwards positive ay = 9.8m/s/s , Sy = 300 Sy = Uyt + ½ayt 300 = 0 + 4.9t t = 300/4.9 Sx = Uxt Sx = 75 x 300/4.9 Therefore distance = 4592m Click to expand... you forgot to square the t in your equation! Sx = 75 x sqrt(300/4.9) Sx = 586.85m
H h_g Member Joined Jul 24, 2014 Messages 32 Location My room Gender Male HSC N/A Dec 13, 2014 #4 so what is the complete correct working.
Fizzy_Cyst Well-Known Member Joined Jan 14, 2011 Messages 1,200 Location Parramatta, NSW Gender Male HSC 2001 Uni Grad 2005 Dec 13, 2014 #5 What he did above but replace Sy = Uyt + ½ayt with Sy = Uyt + ½ayt^2 then t = sqrt (300/4.9) then follow my answer
What he did above but replace Sy = Uyt + ½ayt with Sy = Uyt + ½ayt^2 then t = sqrt (300/4.9) then follow my answer