wait I think i got it lol
can you tell me if my answer for (a) is right???
this one is kind of hard
A bicyclist can coast down a 7.0 degree hill at a steady 9.5 h^-1 km. If the drag force is proportional to the square fo the speed v, so that Fd = cv^2, calculate
(a) the value fo the constant c and
(b) the average force that must be applied in order to descend the hill at 25 h^-1 km. The mass of the cyclist plus bicycle is 80.0 kg. Ignore other types of friction.
ok for (a) I got 6.7 x 10^-13 m^-1 kg
for (b) I am completly lost the way it's put you would assume there to be zero acceleration so how are you suppose to solve (b)???
13 answers
ok fixing answer for (a)
ok how is this for (a)
8.2 x 10^-14 m^-1 kg
8.2 x 10^-14 m^-1 kg
ok for (a)
13.719 m^-1 kg
13.719 m^-1 kg
ok with correct sig figs (a)
13.7 m^-1 kg
13.7 m^-1 kg
ok i'm stuck on part (b)
part b ...
a velocity of 25 h^-1 km
is it constant velocity were there would be no acceleration if so then there would be no net force...
so i'm lost
a velocity of 25 h^-1 km
is it constant velocity were there would be no acceleration if so then there would be no net force...
so i'm lost
ok for (a)
13.7 s^-1 kg
13.7 s^-1 kg
for (b) i got
-.4172 N ;[
-.4172 N ;[
ok I know this is right I redid it
(a) 13.7 m^-1 kg
(a) 13.7 m^-1 kg
ok for b i got 565 N which was correct with book answer in back
constant speed....so force drag=force gravity
mg*sinTheta=cv^2
c= mgsin7deg/(2.64m/s)^2 So I don't get your answer for a.
check that.
mg*sinTheta=cv^2
c= mgsin7deg/(2.64m/s)^2 So I don't get your answer for a.
check that.
ok for drag force
c = v^-2 Fgx = (2.639 s^-1 m)^-2 95.5 N
Fgx = mg sin theta
c = v^-2 Fgx = (2.639 s^-1 m)^-2 95.5 N
Fgx = mg sin theta