Jet streams, which are rapidly moving ribbons of air 6 to 9 miles above the Earth, influence the weather by separating warm and cold air and pushing weather systems around the globe. The movement of a jet stream affects temperatures and precipitation.
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Out of the choices provided I would choose B, this is because A is wrong due to simple machines making our work easier and require less energy, C is wrong due to the work actually being done faster due to simple machines. Now D and B felt like they were both correct but D just doesn't make much since when you apply it to the topic of Simple machines so I found B.
<span>nuclear fusion is observed in stars coming from the combination of two hydrogens to form an atom of helium. Fusion means combination of two or more elements. helium is known to fuel energy which in this case, the great sun which is more than a million Kelvin in temperature already today. hence the answer is true.</span>
A mechanical advantage less than ' 1 ' means the output <u>force</u> is less than the input
force. But <em>distance</em> is gained ... the load moves farther than the driving force moves.
An example of all this is a big father and his little 4-year-old daughter playing
on the see-saw in the park. He adjusts the board so that he's much closer
to the pivot than she is, and that way, their weights can balance each other.
It's set up so that the mechanical advantage from him to her is less than ' 1 '.
Now, look at what happens when Dad sits down on his end of the see-saw,
and pushes it down with his 180 pounds of force. At the other end, the board
is barely lifting her with a force of just 30 pounds. BUT ... as he sinks down
only 1 foot against his end of the board, <em>her</em> end rises 6 feet off the ground.
In order to determine the effect, we will first consider the mathematical expression of Newton's law of gravitation:
F = (Gm₁m₂)/r², where G is the gravitational constant, m represents the mass of a body, and r is the separation between the two bodies.
It is visible that the force is directly proportional to the product of the two masses. Therefore, if one mass is kept constant and the other is tripled, the force will also triple. Thus, the force will be:
26 * 3
= 78 Newtons
