To solve the problem we apply the motion kinematic equations as well as the techniques used to solve second order polynomial equations.
By definition we know that the height of a body is given by the function
As there is no initial speed or a distance previously traveled, the equation is:
Where,
g = Gravitational acceleration
t = time
h= Height
Rearranging to find the time we have,
Then, the sound of the splash take a time 
to travel back, therefore, in time, it is necessary to adhere the new term, which converts the final time into:
If we make a similarity to the polynomial equation of the second degree where 
we have to:
Solving to find x (which is equivalent to 
) we have to:
Since the positive distance is what allows us to find the actual distance traveled we have finally to
The correct answer is B.
Answer:
14
Explanation:
The total no of protons and neutrons in an atomic nucleus is called mass number, nucleon number or atomic mass number. It is denoted by A.
In this problem, we need to find the nucleon number of carbon-14 i.e. mass number of carbon -14. 14 with carbon shows its mass number.
Hence, the nucleon no of carbon-14 is 14.
C. to prepare food, they make the spaghetti in the water
Electromagnetic waves are light waves.
Mechanical waves are waves that require a medium (matter) to travel.
Answer:
G = 1.670 × 
Explanation:
From Newton's law of universal gravitation,
F = 
Where F is the force of attraction, G is the gravitational constant, M is the mass of the earth, R is the radius of the earth.
From Newton's second law of motion,
F = mg
mg =
g = 
⇒ G = 
If the radius of the earth becomes half,
R = 
, then;
G = 
Given that: g = 9.8 m/
, radius of the earth is 6371000 m, mass of the earth is 5.972 × 
kg, then;
G = 
= 1.670 ×
