Puck Auto
The velocity of a 625kg auto is changed from 10m/s to 44.0m/s in 68.0s by an external,constant force?
a.)What is the resulting change in momrntum of the car?
b.)What is the magnitude of the force?
28.
An 845kg dragster accelerates from rest to 100km/h in 90 s
a.)What is the change of momentum in the car?
b.)What is the average force exerted on the car?
c.)What exerts that force?
24.
A hockey puck has a mass of 0.115kg and is at rest.A hockey player makes a shot,exerting a constant force of 30N on the puck for 16s.What speed does it head toward the goal?
26.
A constant force of 6.00N acts on a 3.00kg object for 10.0s.What are the changes in the object's momentum and velocity?
22.
Your brothers mass is 35.6kg and he has a 1.3kg skateboard.What is the combined momentum of your brother and his skateboard if they are going 9.0m/s?
dP = mdv = (625)(44 - 10) = 21,250 kg m/s
F = mdv/dt = (21250)/(68) = 312.5 N
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