<h3>
Answer:</h3>
2.5 mg
<h3>
Explanation:</h3>
<u>We are given</u>;
- Original mass of I-131 is 40.0 mg
- Half life of I-131 is 8 days
- Number of days 32 days
We are required to determine the mass that will remain;
N = N₀ × 0.5^n
where, N is the remaining mass, N₀ is the original mass, and n is the number of half lives.
Therefore;
n = time ÷ half life
= 32 days ÷ 8 days
= 4
Therefore;
Remaining mass = 40.0 mg × 0.5^4
= 2.5 mg
Hence, the remaining mass of I-131 after 32 days is 2.5 mg
Answer:
B. objects remain in the same state of motion unless a force acts on them
Explanation:
Sana nakatulong
Since the equation for frequency is:
frequency = velocity/wavelength, then the correct answer is B. velocity.
In order to calculate the velocity, we just need to multiply frequency and wavelength.
A heat engine has three components namely the heat source, the heat sink and the object where the work is done. Heat engines are used to convert heat to work. <span>A 100% percent efficiency means all heat energy is converted into work energy. This means there is no heat lost to the heat sink. So, in this situation, the temperature should still stay the same. However, this cannot be done. A heat lost is needed in order for the heat engine to keep running continuously. Thus, in reality, a 100% efficiency is impossible.</span>
The time of flight of
the dart is 36.761 s, it can be used to solve the initial velocity of the dart
bt the formula t= 2v/g, which v is equal to 180.31 m/s which is actually very
fast. We can now solve the maximum distanc H= v^2/2g which is equal to 1657.11
m.