11.54 minutes
Explanation:
The decay rate equation is given by
where is the half-life. We can rewrite this as
Taking the natural logarithm of both sides, we get
Solving for ,
Answer:
A force that objects exert, stopping solid objects from passing through each other aka contact.
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Answer:
Option C
A feather falls from one end of a tube to the other inside a vacuum
Explanation:
In conservative force field, which in this case is a vacuum, you expect that there will be no loss of energy to air-friction. Therefore, when a feather falls from one end of the tube to the other side which is a vacuum, we expect no energy loss. Conservative forces are the forces that are path-independent. This implies that in a closed loop, the total work done is zero. Considering the options given, only feather falls from one end of a tube to the other inside a vacuum meets the criteria
PART a)
By energy conservation we can say
divide whole equation by mass "m" and plug in all given data
so gymnast will reach the floor with speed 5.21 m/s
PART b)
Now the gymnast bend her knees by 0.1 m and comes to rest
so here we will have
now the force on the gymnast will be
so during landing the force will be 6798.5 N