Rebecca heated 50mL of water from 0 degrees Celsius to 60 degrees Celsius. How much energy did she use to heat the water? Rememb
1 answer:
Answer:
Q = 12540 J
Explanation:
It is given that,
Mass of water, m = 50 mL = 50 g
It is heated from 0 degrees Celsius to 60 degrees Celsius.
We need to find the energy required to heat the water. The formula use to find it as follows :
Where c is the specific heat of water, c = 4.18 J/g°C
Put all the values,
So, 12540 J of energy is used to heat the water.
You might be interested in
<h2>Answer: the falling time</h2>
Explanation:
When a body or object falls, basically two forces act on it:
1. The force of air friction, also called<em> </em><u><em>"drag force"</em></u> :
(1)
Where:
is the drag coefficient
is the density of the fluid (air for example)
is the velocity
is the transversal area of the object
So, this force is proportional to the transversal area of the falling element and to the square of the velocity.
2. Its <u>weight </u>due to the gravity force :
(2)
Where:
is the mass of the object
is the acceleration due gravity
So, at the moment <u>when the drag force equals the gravity force, the object will have its terminal velocity:</u>
(3)
(4)
(5) This is the terminal velocity
As we can see, there is no "falling time" in this equation.
Therefore, the terminal velocity is not dependent on the falling time.
Answer:
Explanation:
Here we can use energy conservation
As per energy conservation conditions we know that work done by external source is converted into kinetic energy of the disc
Now we have
now we know that work done is product of force and displacement
so here we have
now for moment of inertia of the disc we will have
now from above equation we will have