Answer:
Boiling water is an example of a physical change and not a chemical change because the water vapor still has the same molecular structure as liquid water.
(credits to lumenlearning)
Explanation:
Answer:
3.56 m
Explanation:
As the object falls from height h, and then compresses the spring a distance of 0.66m, its initial potential energy is converted into elastics energy of the spring.
Let g = 9.81m/s2. Knowing that the total change in potential height is h + d, we have the following equation





A) Calling F the intensity of the horizontal force and d the displacement of the block across the floor, the work done by the horizontal force is equal to

b) The work done by the frictional force against the motion of the block is equal to:


Part of these 105.1 Joules of work becomes increase of thermal energy of the block (

), and part of it becomes increase of thermal energy of the floor (

). We already know the increase in thermal energy of the block (38.2 J), so we can find the increase in thermal energy of the floor:

c) The net work done on the block is the work done by the horizontal force F minus the work done by the frictional force (the frictional force acts against the motion, so we must take it with a negative sign):

For the work-energy theorem, the work done on the block is equal to its increase of kinetic energy:

So, we have
Answer:
Explanation:
Newton's law states that F=mg, or in other applications F=ma, where:
F= force acting on the system
m= mass of the system and
a= acceleration (or g= gravitational acceleration which is 9.8m/s^2)
In your question we know the following variables:
The mass of the arrow (m= 100g, however we should use kilograms- 0.1kg)
The acceleration of the arrow (a=50m/s^2)
If we substitute these values into our given equation, we can find the force acting on the arrow.
F = m x a
F= (0.1) x (50)
F = 5N
hope this helps :)