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Discuss the feasibility of propelling a sail boat in the absence of wind by having an onboard fan blowing some air into the sail. Justify your answer within a Newtonian mechanics framework.
Two balls of identical size but different masses are dropped at the same time from the same height on Earth. Alice and Bob debate about which ball will reach the ground first according to Newtonian Mechanics.
- Alice claims that both balls would reach the ground at the same time if air resistance were neglected. What assumptions are necessary for her to successfully defend this idea?
- Bob, however, claims that even if air resistance were neglected, the heavier ball would reach the ground first. What assumptions are necessary for him to successfully defend this idea?
Discuss whether the melting of the ice cap on Earth can affect the spinning rotation of the Earth. You shall ground your discussion with Newtonian mechanics.
We denote E and B the (non-radiating) electric and magnetic fields as observed in some inertial frame of reference.
- By giving an example of your choice explain how changing the inertial frame of reference can make the electric field and/or magnetic field appear or disappear (in the chosen frame of reference).
- We consider a situation where an observer only measures a static electric field in some inertial frame of reference. Is it possible to find an inertial frame of reference where the same electromagnetic field will be seen as a static magnetic field only?
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