A student is asked to describe the path of a paper airplane that is thrown in the classroom.

Which statement best describes the path of the paper airplane?

The paper airplane will move in a straight line, according to Newton’s first law of motion.
The paper airplane will drop straight to the ground once its inertia gives in to the force of gravity.
The paper airplane will create a curved path toward the floor as it is pulled toward Earth’s center.
The paper airplane will orbit around the desk because it is the object with the largest mass in the room.

The paper airplane will create a curved path toward the floor as it is pulled toward Earth’s center.

Explanation:

Among the given options, only 3rd option could happen if a student throw a paper airplane in the class. This is because of the reason that paper airplane is thrown in the air with initial force and it has inertia which will allow it to fly for some distance in a curved path and then falls on the ground. The curved path will be according to the projectile fashion in which any material finally reaches ground because of only initial kinetic energy.

First option is incorrect because the pathway of the paper airplane will not be a complete straight line in any case. The flight of paper airplane is subject to air pressure (air resistance) and other parameters.

Second option is incorrect because the paper airplane will not immediately drop and fall to the ground rather it will still have some flight because it was thrown with a force and the air pressure will allow it to travel some distance before it falls.

Last option is incorrect because it is scientifically incorrect as well as paper airplane is not a largest object in the classroom.

which are post-impressionist paintings? check all that apply?

explanation:

post-impressionism is a predominantly french art movement that developed roughly between 1886 and 1905, from the last impressionist exhibition to the birth of fauvism. post-impressionism emerged as a reaction against impressionists' concern for the naturalistic depiction of light and color.

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the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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