<u>Answer:</u> The remaining sample of X is 6.9 grams.
<u>Explanation:</u>
All the radioactive reactions follow first order kinetics.
The equation used to calculate rate constant from given half life for first order kinetics:
We are given:
Putting values in above equation, we get:
The equation used to calculate time period follows:
where,
= initial mass of sample X = 78 g
N = remaining mass of sample X = ? g
t = time = 16.5 min
k = rate constant = 
Putting values in above equation, we get:
Hence, the remaining amount of sample X is 6.9 g
Answer:
4500
Explanation:
hey there!
first we convert the khz to hz=30000hz
we use the formula 2d=distance×time
2d=1500×6
d=9000/2=4500
i think this is the right answer....
hope this helps u :)
Answer:
26 V
Explanation:
Given:
The three resistors 5.5 V. 8.2 V. and 12,3 V. are connected in series.
Now we have to find out the source voltage to which these resistors arc connected ?
Solution:
As we know in series the magnitude of current is uniform but the voltage divides between the resistors supplied from source voltage.So the magnitude of source voltage is, 5.5 V + 8.2 V + 12.3 V = 26 V
Hence, the value of the source voltage to which these resistors are connected is 26 V
Oil is a lubricant which helps increase friction. when u spread sand on a place where oil is spilled the sand reduces friction between road and vehicle tire. the vehicle wont skid.
Answer:
Acceleration will take for 0.12 seconds.
Explanation:
Given:
Initial velocity of the blood, 
= 0 m/s
Final velocity of the blood, 
= 30 cm/s = 0.3 m/s
Distance to be considered, 
= 1.80 cm = 0.018 m
We have to find the time taken to covered the said distance.
Let the time taken be "t" seconds.
Equation of motion:
⇒ 
...equation (i)
⇒ 
...equation (ii)
Now,
Using equation (i) we can say that:
⇒
⇒ 
⇒ 
...equation (iii)
Plugging x = 0.018 m in equation (ii).
⇒
⇒ 
<em>...breaking at^2 as (at)(t)</em>
⇒ 
⇒ 
<em> ...plugging at=0.3 from equation (iii)</em>
⇒ 
⇒ 
⇒ 
⇒ 
The acceleration will take for 0.12 seconds.
