Answer:
The time take is 
Explanation:
From the question we are told that
The decay constant is 
The percentage fall is 
The equation for radioactive decay is mathematically represented as
Where is 
is the new amount of the new the isotope while 
is the original
At initial 
% = 1
At 
% = 0.80
=> 
=>
Answer:
3.6*10^18s
Explanation:
To find the period of the satellite
We need to apply kephler's third law
Which is
MP² = (4π²/G) d³
d=semi-major axis which is the distance from center of moon = 98km+1740km = 1838km
where M= mass of the moon = 7.3x10^22kg
P=period
G=newtonian gravatational constant= 6.67x10^-11
To find the Period solve for P
P = √[(4π²/G M)xd³]
P=√(4 π²/6.67x10^-22*7.3x10^22kg) x (1.838x10^6m)³]
= 3.6*10^18s
The resistance is increased when more and more bulbs are added to the circuit.
Iron and nickel are the elements most similar to cobalt
Answer:51.44 units
Explanation:
Given
x component of vector is 
y component of vector is 
so position vector is
Magnitude of vector is
|r|=51.44 units
Direction
vector is in 2nd quadrant thus
