Through the rope, determine the amount of work that you both do on the tree stump. Ivans
3.
A music student in the faculty of music pulls her cello, contained in a hard case (total mass of
15.0 kg) by applying a constant 7.00 N force at an angle of 30.0° with the horizontal ground.
If she pulls it at a constant speed for 20.0 m, determine the work the student does on the
cello. [121 J]
13 kJ

increase masses, decrease separation

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.