Answer:
it should be -2m/s
Explanation:
Because it is going down from minutes 6-8. And down in most cases means negative. And since it is going down 2 it should be -2m/s.
Hope this helped!!
Answer:
1.) Check the explanation for the answer
2.) 10 MJ
Explanation:
Given that a coal power plant station generates electricity at night when it is not needed. Some of this energy is stored by pumping water up to a mountain lake. When there is high demand for electricity, the water is allowed to flow back through a turbine to generate electricity.1- Write down the forms of initial and final energy transfer.
Solution.
The initial conversion will be :
Chemical energy is converted to mechanical energy.
The final conversion will be :
Mechanical energy is converted to electrical energy. While the electrical energy is converted to light energy.
2- On one occasion, 2000 kg of water is pumped up through a vertical height of 500 m. Calculate the gravitational potential energy. (g= 10 m/s^2)
The gravitational potential energy can be calculated by using the formula
Energy = mgh.
Where
M = mass
H = height
g = acceleration due to gravity
Substitute all the parameters into the formula
Potential Energy = 2000 × 500 × 10
Potential energy = 10000000 Joule
Potential energy = 10 MJ
Normal force. Normal force is always present when there is contact between two items. Normal force is counteracting the gravitational force.
Explaining the incorrect answers:
-It’s not frictional force because friction only occurs when something is moving and also making contact. While there is contact in this scenario, the apple is not moving.
-There is no applied force; that would be something like a push.
-There is a gravitational force on the table, but it doesn’t keep the apple’s push in check. They are both pointed downwards, to the earth.
Hope this helps!
When a plane travels 395,000 meters in 9,000 seconds its speed is 395,000 ÷ 9000 = 43.888888 (the 8 repeats) meters per second.