This took me a short while to figure out, but I am still not entirely sure if this is correct, this is just from my basic understanding of Newtons Second Law of Motion.
You have a 4kg cart with a force of 20N acting on it.
The formula for working out the acceleration is.
a=Fnet÷mass
Substitute in the information.
a=20N÷4kg
Now you solve it to give you.
a=5m/s
So now what you should be able to do is figure out that after 10 seconds the cart travelling at 5m/s would have travelled 10 metres.
This is achieved by finding out how many 5's go into 10 which is 2.
So you do 5×2 which equals 10.
The 4kg cart has travelled 10 meters in 10 seconds with a force of 20N acting upon it.
I hope that this has helped you.
Acceleration
On a velocity time graph, the y-axis is velocity, and the x-axis is time. So the slope is the change in velocity for every unit of change in time.
acceleration- the rate of change of velocity per unit of time.
hope this helps :)
Answer:
B) The mass of the reactants equals the mass of the products.
Explanation:
In any balanced chemical reaction, it is known by default that the mass of the products and reactants must always be the same.
This is according to the law of conservation of mass.
- Every chemical reactions obey the law of conservation of mass.
- The law states that "In every chemical reaction, matter is neither created nor destroyed but changed from one form to another".
- In essence, there is no mass loss in a chemical reaction.
- This law is usually shown by the balancing of chemical species on both sides of the equation.
Answer:
The kinetic energy of the mass when the spring is stretched 5 cm is 2.55 J
Explanation:
Here we have
The mass on the spring = 0.4 kg
Spring stiffness = 200 N/m
Speed when compressed 10 cm = 3 m/s
E = 0.5·m·v² + 0.5·k·x² = 0.5·k·x²
Therefore
When x = 10 cm = 0.1 m, we have
E = 0.5·0.4·3² + 0.5·200·0.1² = 0.5·200·x² = 2.8
x² = 2.8/100 = 0.028,
x = 0.167 m
When the mass is at 5 cm we have
E = 0.5·0.4·v² + 0.5·200·0.05² = 2.8 J
Therefore, the kinetic energy = 0.5·0.4·v² = 2.8 - 0.25 = 2.55 J
The kinetic energy of the mass when the spring is stretched 5 cm = 2.55 J.