An 11-year-old girl’s height increased by several inches in three months. Which example of the characteristics of life is most s
imilar?
A)An octopus camouflages with the ocean floor.
B)A giraffe eats leaves off a tree.
C)A bee stings a person who is swatting it away.
D)A kitten gains weight.
E)A butterfly moves pollen from one flower to another.
A)An octopus camouflages with the ocean floor.
B)A giraffe eats leaves off a tree.
C)A bee stings a person who is swatting it away.
D)A kitten gains weight.
E)A butterfly moves pollen from one flower to another.
2 answers:
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Answer:
0.767
Explanation:
The work done on the truck by the frictional drag force is given by
where
F is the magnitude of the frictional force
d = 38.0 m is the maximum displacement allowed for the truck
The negative sign is due to the fact that the force of friction is opposite to the motion of the truck
The force of friction can also be written as:
where
is the coefficient of kinetic friction between the truck and the lane
m is the mass of the truck
g is the acceleration of gravity
So we can rewrite the work done as
(1)
According to the work-energy theorem, the work done by friction is equal to the change in kinetic energy of the truck:
(2)
where
v = 0 is the final velocity of the truck
u = 23.9 m/s is the initial velocity of the truck
By combining (1) and (2) we get
And solving for , we find the minimum coefficient of kinetic friction able to stop the truck in a distance d:
According to the Work-Energy Theorem, the work done on an object is equal to the change in the kinetic energy of the object:
Since the car ends with a kinetic energy of 0J (because it stops), then the work needed to stop the car is equal to the initial kinetic energy of the car:
Replace m=1100kg and v=112km/h. Write the speed in m/s. Remember that 1m/s = 3.6km/h:
Therefore, the answer is: 532,346 J.