The correct answer to the question is B) 5,700 years.
EXPLANATION:
Before going to answer this question, first we have to understand half life period of a radio active substance.
The half life period of a radio active substance is defined as the time in which half of the radio active specimen has undergone decay.
As per the question, the initial concentration of the radioactive carbon-14 is given as 10,000.
Hence, initial concentration .
After 5,700 years, the remaining radio active specimen is 5000. It means that half of the radio active specimen has undergone decay in 5,700 years.
Hence, half life period of the radio active carbon-14 specimen is 5,700 years.
Answer:
a)
b)
Explanation:
We start the exercise knowing that a ball is thrown up with an initial velocity of 65 ft/s with an initial height of 680 ft.
To calculate the maximum heigh, we know that at the top of the motion the ball stop going up and start going down because of the <em>gravity</em>
First of all, we need to calculate the time that takes the ball to reach the maximum point.
a)
Knowing that time, <u><em>we can calculate the height to which the ball rises:</em></u>
b) Now, to know the time that the ball reach the bottom of the cliff, we know that the final height is y=0ft
This is a classic quadratic equation, that can be solve using the quadratic formula
a=-16.1
b=65
c=640
Solving for t, we have that
or
Since the time can not be negative:
Answer:
B
Explanation:
The kinetic energy in an object is converted into potential energy. This makes the kinetic decrease, while the potential increases.
It will take approximately 8 - 10 feet.
The mass lost in the nuclear reaction is all converted to energy.