Answer:
Explanation:
We know that heat relates to mass, specific heat and variation of temperature experimented because of this heat through the equation . The heat released by the unknown material is absorbed by water, so we have , and we can write:
Since thermal equilibrium is reached we know that , where we have added to convert the temperature from Celsius to Kelvin, as <em>we must do</em>. Since we want the specific heat of the unknown material, we do:
Which for our values is:
Objects that are free to move "fall" towards the center of the Earth because of
the gravitational forces that attract the Earth and the object toward each other.
An object on or near the surface of the Earth that has only the force of gravity
and no other forces acting on it accelerates steadily toward the center of the
Earth at the rate of 9.81 meters per second every second.
At the same time, of course, the Earth accelerates toward the object, although
at a considerably lower rate.
Answer:
Kinetic energy,
Explanation:
It is given that,
Mass of ball, m = 0.9 kg
It is dropped form a height of 7 m, h = 7 m
When the ball is at certain height it will have only potential energy. As it hits the ground, its potential energy gets converted to kinetic energy as per the law of conservation of energy.
So,
So, the kinetic energy when it hits the ground is 61.74 Joules.
10Km South. Displacement is the total distance the subject is from the starting point.