Because once you use oil you can not reuse it but the sun you can because it is always here and it has solar energy
<span>The acceleration of an object is directly proportional to the force applied to it and .... Calculate the acceleration if you push with a 20-N horizontal force on a 2-kg .... If a 1-N net force accelerates a 1-kg mass at 1 m/s2, what is the acceleration ... 30 000 kg, in takeoff when the thrust for each of its four engines is 30 000 N?</span>
Answer:
t = 2.97[s]
Explanation:
To solve this problem we must use the following kinematics equations, we must bear in mind that the positive sign of the acceleration value means that the car is increased its speed.
where:
x - xo = 180 [ft]
a = acceleration [ft/s^2]
Vo = initial velocity = 53 [ft/s]
Vf = final velocity = 68 [ft/s]
Now replacing we find:
(68^2) = (53^2) + (2*a*180)
a = 5.04 [ft/s^2]
Now using the following equation:
68 = 53 + (5.04*t)
t = (68 - 53)/5.04
t = 2.97[s]
Answer:
1) B a compound
2) C a heterogeneous mixture
3) A an element
Explanation:
1) I know this because a compound is mixture of different elements which cannot be identified by the naked eye. And from the statement above the substance is distinguished to have to different elements by its chemical formula.
2) I know this because a heterogeneous mixture is a mixture composed of two or more elements which can easily be seen by the physical eye or can be distinguished easily.
3) I know this because noble gases are not a mixture of any kind. They are elements. Elements are substances that cannot be broken down into simpler substances.
