Asad Raza said:I reckon that the time should decrease as the height approached (of a vertically thrown object for instance) decreases
Details matter. Is the object at rest, falling or rising? Does it have a spin? What about its horizontal velocity? What about its shape?Asad Raza said:Oh yes! If we consider two similar heights in the journey of an object in space and atmosphere. The one in the atmosphere will take more time, I guess, since it has to sail through air drag. Right?
russ_watters said:Am I missing something here? I see no description at all about what kind of objects we're discussing and what is making them move. It matters a lot if we're talking about a bowling ball or a glider, for example.
Take, for instance, the case of a piece of [indestructible] paper hurled upward at escape velocity. It takes longer to hit ground in vacuum than in air.Drakkith said:Unless the question is about throwing something with a rocket engine, I don't see how any of that matters since we're talking about vacuum vs non vacuum. Seems pretty clear cut to me.
If you drive a golf ball or throw a paper airplane in a vacuum it will come down faster than if you do it in air... unless it has topspin or is flying upside-down in which case it may generate negative lift and fall much faster than when either creating positive lift or thrown in a vacuum.Drakkith said:Unless the question is about throwing something with a rocket engine, I don't see how any of that matters since we're talking about vacuum vs non vacuum. Seems pretty clear cut to me.
jbriggs444 said:Take, for instance, the case of a piece of [indestructible] paper hurled upward at escape velocity. It takes longer to hit ground in vacuum than in air.
russ_watters said:If you drive a golf ball or throw a paper airplane in a vacuum it will come down faster than if you do it in air... unless it has topspin or is flying upside-down in which case it may generate negative lift and fall much faster than when either creating positive lift or thrown in a vacuum.
In general, the time of flight of objects in a vacuum is longer than in air. This is because air resistance slows down the object's motion, while in a vacuum there is no air resistance.
The greater the air resistance, the shorter the time of flight of an object. This is because the force of air resistance acts in the opposite direction of the object's motion, slowing it down and reducing its time of flight.
The weight of an object does not significantly affect its time of flight in either air or vacuum. What matters more is the shape and surface area of the object, which determines the amount of air resistance it experiences.
The time of flight of objects in a vacuum is often used as a standard measurement because it eliminates the effects of air resistance and allows for more accurate comparisons between different objects. It also follows the laws of motion without any external factors influencing the object's motion.
No, the time of flight of objects in air and vacuum cannot be exactly the same. Even in a vacuum, there may be small variations due to factors such as the shape and surface of the object, as well as the strength of the gravitational field. Additionally, air resistance will always affect the time of flight in air, making it impossible for it to be the same as in a vacuum.