m = mass of the ball at the edge of the cliff = 2 kg
h = height of the cliff from where the ball falls off = 40 m
g = acceleration due to gravity = 9.8 m/s²
gravitational potential energy of the ball at the top of the cliff is given as
PE = mgh
inserting the above values in the formula
PE = (2) (9.8) (40)
PE = 784 J
KE = kinetic energy of the ball as hits the ground.
initially at the top of cliff , the ball has no kinetic energy and only potential energy. as the ball falls down the cliff , the speed of ball increase which increases the kinetic energy and potential energy decrease by same amount as the height above the ground decrease.
using conservation of energy
kinetic energy of ball as it hits the ground = Potential energy of the ball at the top of cliff
KE = PE
KE = 784 J
<h3>
Answer:</h3>
<h3>
Explanation:</h3>
_______________
h=7,5 m
g=10 m/s²
ρ=1000 kg/m³
_______________
p - ?
_______________
p=ρgh=1000 kg/m³ · 10 m/s² · 7,5 m = 75000 Pa = 75 kPa
Answer:
Distance
Explanation:
When using the length of the space between two points, the distance measures the length
Answer:
Generally speaking, as the human population grows, our consumption of natural resources increases. More humans consume more freshwater, more land, more clothing, etc. ... For example, natural gas plants have become increasingly more efficient, thus humans are able to obtain more energy out of the same amount of gas.
Rapid population growth is detrimental to achieving economic and social progress and to sustainable management of the natural resource base. But there remains a sizeable gap between the private and social interest in fertility reduction, and this gap needs to be narrowed.