Answer:
21st of December
Explanation:
In the northern hemisphere there occurs winter solstice on 21st of December. During this time, the tilt of the earth in the northern hemisphere is away from the sun. So the places near and at Antarctica, there will be sunlight for about 24 hours and the sun does not set on this particular day.
And, on the other hand, the places near the Arctic circle experiences darkness for about 24 hours and the sun does not rise on this specific day.
Answer:
23 m/s
Explanation:
The net external force on the propeller is 17N
The airplane is 0.75 kg
Therefore the acceleration of the plane can be calculated as follows
= 17/0.75
= 23 m/s
Hence the acceleration of the airplane is 23 m/s
To solve the problem you must first know that by keeping the linear moment P1 = P2. You must find P1 from the system and equal it to P2 of the system, from that equation you clear the final velocity 1. Which will result in V1f = 60.16 cm / s to the north.I attach the solution.
The purpose of the machine is to leverage its mechanical advantage such that the force it outputs to move the heavy object is greater than the force required for you to input.
But there's no such thing as a free lunch! When you apply the conservation of energy, the work the machine does on the object will always be equal to (in an ideal machine) or less than the work you input to the machine.
This means that you will apply a lesser force for a longer distance so that the machine can supply a greater force on the object to push it a smaller distance. That is the trade-off of using the machine: it enables you to use a smaller force but at the cost of having to apply that smaller force for a greater distance.
The answer is: The work input required will equal the work output.
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