At 9:00 am, a dog chased a squirrel 8 miles north. The dog gave up and stopped chasing the squirrel at 10:00 am. What was the av
1 answer:
8mph North
Explanation:
Given parameters:
Start time = 9.00am
Final time = 10.00am
Displacement = 8miles north
Unknown:
Average velocity of the dog = ?
Solution:
Velocity is the change of displacement with time. It is expressed as:
Velocity =
The change in time from 9 - 10am is 1 hour:
Velocity = = 8mph
The velocity has both magnitude and direction and it is better written as 8mph due north.
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Velocity brainly.com/question/2562700
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Answer:
8.625 grams of a 150 g sample of Thorium-234 would be left after 120.5 days
Explanation:
The nuclear half life represents the time taken for the initial amount of sample to reduce into half of its mass.
We have given that the half life of thorium-234 is 24.1 days. Then it takes 24.1 days for a Thorium-234 sample to reduced to half of its initial amount.
Initial amount of Thorium-234 available as per the question is 150 grams
So now we start with 150 grams of Thorium-234
So after 120.5 days the amount of sample that remains is 8.625g
In simpler way , we can use the below formula to find the sample left
Where
is the initial sample amount
n = the number of half-lives that pass in a given period of time.
Answer:
B.
Explanation:
The unit for rate is M/s while the unit for each molecule should be M. You can find the unit for k by putting the units for rate and the molecules into the equation
rate= k{X][Y]
M/s= k * *
k= (M/s) / ()
k=
You can also use this predetermined formula to solve this problem faster: k=
Where n is the number of molecule. There are 3 molecule(2X and 1Y) so n=3, so
k=
k= =
=