For the first question it would be a unit obtained from the change in velocity per unit of time or m/s^2.
The vf and vi represent the final and initial velocity of the object and or item.
Knowing the formula for acceleration is simply change in velocity divided by time
Vi = 0
Vf = 27 m/s
t = 10 s
Vf = vi + at
27 = 10a
a = 27/10 or 2.7 m/s^2.
The atomic number of an element is the same as the number of protons. As long as the atom is neutral, your electrons and protons will be the same number. To find neutrons, you subtract the atomic number from the mass number.
mass number - atomic number = number of neutrons
Answer:
The watch is 40.9 years old.
Explanation:
To know how many years old is the watch we need to use the following equation:
(1)
Where:
: is the brightness in a time t = (1/10)I₀
: is the initial brightness
λ: is the decay constant of tritium
The decay constant is given by:
(2)
Where:
: is the half-life of tritium = 12.3 years
By entering equation (2) into (1) we have:
By solving the above equation for "t" we have:
Therefore, the watch is 40.9 years old.
I hope it helps you!
say, a fridge is a nonliving thing. but its characteristic is that it keeps food cold and hold the food (I think that's what you mean)
