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2 answers:
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Answer:
8.6 miles
Explanation:
We need to calculate the components of the total displacement along the east-west and north-south directions first.
In the first part, Erica moves 5.2 miles at 25∘ north of east. So the components of this displacement along the two directions are:
East:
North:
In the second part, Erica moves 5.0 miles north. So, the components of this displacement are:
East:
North:
So the components of the total displacement are
East:
North:
Therefore the magnitude of the displacement, which is the straight-line distance from the starting point to the end of the race, is
Answer:
The value of of the Boltzmann constant is .
Explanation:
Generally the formula for average kinetic energy of a molecule :
where,
k = Boltzmann’s constant
T = temperature = 290 K
Given:
Number of molecules in 1.7 moles:
Average kinetic energy of 1.7 moles = 1.4 MJ =
Average kinetic energy of 1 molecule =