Answer:
10,000 years
Explanation:
Given that,
Half life of the radioactive isotope, = 5000 years
Initial composition, = 16 grams
Final composition, = 4 grams
We know that,
Therefore, the age of the rock is 10,000 years.
The waves produced on the earth’s surface is called
2 answers:
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Answer:
Explanation:
The motion of a projectile consists of two independent motions:
- A uniform motion along the horizontal direction (constant velocity)
- A uniformly accelerated motion along the vertical direction (constant acceleration)
The time of flight of a projectile is given by
where
is the initial vertical velocity
is the acceleration due to gravity
Here the time of flight is
t = 8 s
So, the initial vertical velocity is:
At the same time, the horizontal distance covered by the projectile is given by
where
is the horizontal velocity, which is constant
t is the time of flight
Here we know that the range of the projectile is 0.3 km, so
d = 0.3 km = 300 m
So the horizontal velocity is
Therefore, we can find the angle of projection of the projectile by using: