2. Sa se calculeze masa unui corp care are greutatea de 45 N. 3. O forță de 30 N ii produce unui resort, acționând asupra lui, o deformare de 6 cm. Sa
se calculeze constanta elastica a resortului.
4. Care va fi deformarea unui resort sub acțiunea unei forte de 5N, daca la acțiunea unei
forte de 15N, deformarea a fost de 6 cm?

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

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explanation:

c) up is the direction the magnetic force is acting on the charge.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.