Copper spheres of 20-mm diameter are quenched by being dropped into a tank of water that is maintained at 280 k. the spheres may be assumed to reach the terminal velocity on impact and to drop freely through nitrogen collection chamber nitrogen nozzle molten solder pot volume piezoelectric oscillator v, t[infinity] = 30°c dp = 130 m the water. estimate the terminal velocity by equating the drag and gravitational forces acting on the sphere. what is the approximate height of the water tank needed to cool the spheres from an initial temperature of 360 k to a center temperature of 320 k?

c, 1a hope this

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.

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

i do.

explanation:

i want to explore the wonders of the universe and find out if there really is life out there. i think the universe is beautiful.