Answer:
The ball is in the air t= 3.5 seconds.
Explanation:
h= 60m
g= 9.8 m/2²
h= g*t²/2
t= √(2*h/g)
t= 3.5 sec
Answer : First of all, to harness the solar energy and utilize it for the decomposition of water to make hydrogen fuel cell seems to be easy but practically it has many hurdles in its way. It might not work well, when the days would not be sunny. Also, the production of hydrogen fuel would require decomposing water which may need a high energy of activation, which would be more than the energy that will be produced from the fuel cell.
Answer:
Work occurs when a force causes an object to be displaced.
Explanation:
- When any force acts on a body, and there is a displacement, work is said to be done.
- Work done is equal to the product of the force on the body and the displacement caused by it.
- The change in the energy of the system is due the work done.
- Three thing that help determine the work done on an object are the force acting on it, the displacement caused by it and the cause of the displacement.
Answer:
c. Rock, metal, and ices made of materials like water, ammonia, and methane condensed into a solid and grew large enough to gravitationally attract hydrogen and helium gas from the Solar Nebula.
Explanation:
Given the information about dependence of planetesimal composition on distance from the Sun and the existence of the frost line resulted in two main types of planets in our Solar System: the inner rocky planets and the outer gas giants. I have learned that planetesimal formation through accretion, and the types of materials that condensed at that distance from the Sun, will lead to the formation of Rock, metal, and ices made of materials like water, ammonia, and methane condensed into a solid and grew large enough to gravitationally attract hydrogen and helium gas from the Solar Nebula.