Answer:
a) 0.0288 grams
b) 
Explanation:
Given that:
A typical human body contains about 3.0 grams of Potassium per kilogram of body mass
The abundance for the three isotopes are:
Potassium-39, Potassium-40, and Potassium-41 with abundances are 93.26%, 0.012% and 6.728% respectively.
a)
Thus; a person with a mass of 80 kg will posses = 80 × 3 = 240 grams of potassium.
However, the amount of potassium that is present in such person is :
0.012% × 240 grams
= 0.012/100 × 240 grams
= 0.0288 grams
b)
the effective dose (in Sieverts) per year due to Potassium-40 in an 80- kg body is calculate as follows:
First the Dose in (Gy) = 
= 
= 
Effective dose (Sv) = RBE × Dose in Gy
Effective dose (Sv) = 
Effective dose (Sv) =
Answer:
false
Explanation:
we can only see wavelengths on the visible light spectrum. everything else is invisible to us
Answer:
4940.12 m/s
Explanation:
For the net force on the moving electron to be zero, the Magnetic force must then match the electric force.
Magnetic force = Electric force
Magnetic force = qvB
Electric force = Eq
qvB = Eq
v = (E/B)
E = Electric field = 1.65 kV/m = 1650 V/m
B = Magnetic field = 0.334 T
v = (1650/0.334)
v = 4940.12 m/s
Hope this helps!!
The angular velocity of the cockroach does not change as long as it rotates with the disk it has the same angular velocity as the disk but by changing the distance from the center of the disk the linear velocity changes (V=r×ω) because the radius changes.
in order to find the kinetic energy you can use this formula k=1/2 × m × V²
so k/k0 = (V/V0)² = (r/r0)²
where the subscripts 0 denotes to the initial position of the cockroach so r0=2×r then we have k/k0=1/4
Answer:
Explanation:
It is given that,
Mass of puck 1, 
Mass of puck 2, 
Initial speed of puck 1, 
Initial speed of puck 2, 
After the collision, the speed of puck 1, 
Let 
is the final velocity (in m/s) of puck 2 after the collision. Using the conservation of momentum as :
So, the final velocity of the puck 2 after the collision is 24 m/s. Hence, this is the required solution.
