Physics Help. a) A 90 kg physics teacher sits on his 6 kg bike waiting for a...

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...race to begin. What is the weight? a) A 90 kg physics teacher sits on his 6 kg bike waiting for a race to begin. What is the weight of the teacher and his bike?
b) What is the normal force exerted by the ground on the nike?
c) The teacher pedals and accelerates uniformly from rest to reach 24 km/hr in 20 seconds. How much force does this require?

Thanks for your help.
 
a) 96kh x 9.8m/s^2 = weight
b) normal force IS weight so its the same, unless it means JUST the bike and not including the bike

c) 24km/hr = 6.67m/s

divide 6.67 by 20 to get the acceleration

=0.33m/s^2

sum of forces = mass x acceleration

force = (96kg)(0.33m/s^2)

= 32N
 
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