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3 years ago

When is an object that has been dropped from a great height through the air closest to vein in a free fall?

2 answers:

7 0

-- "Free fall" means no forces acting on the object except for gravity.

-- An object dropped through air has two forces on it -- gravity and air resistance.

-- So we're looking for the part of the drop where air resistance is smallest.

-- The force of air resistance depends on the speed through the air, so the
force of air resistance is smallest when velocity downward is smallest.

Degger [83]3 years ago

6 0

If there were no air, the object would be in free fall the entire time, and there would be no "terminal velocity". So, the object is closest to being in free fall when the effects of the air are minimized--and that is when the object has the smallest speed relative to the air.

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6- A metal block measures 10 cm x 2 cm x 2 cm. what is its volume? how many blocks each

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3 years ago

They create a heat engine where the hot reservoir is filled with water and steam at equilibrium, and the cold reservoir is fille

Marizza181 [45]

Answer:

The efficiency of Carnot's heat engine is 26.8 %.

Explanation:

Temperature of hot reservoir, TH = 100 degree C = 373 K

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3 years ago

The gravitational force between the charged constituents of the atom is negligible compared with the electric force between them

katrin2010 [14]

Answer: The initial force is reduced a factor 1/4 when the separation between charge is doubled

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Finitial=k*q1*q2/d^2 where d is the distance between charges and k is a constant

if the distance is doubled this means 2*dinitial thus the new force is equal to F initial* 1/4

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2 years ago

Nicole throws a ball at 25 m/s at an angle of 60 degrees abound the horizontal. What is the range of the ball?

just olya [345]

Answer:

the range or the ball is 48.81 m

Explanation:

given;

Nicole throws a ball at 25 m/s at an angle of 60 degrees abound the horizontal.

find:

What is the range of the ball?

solution:

let Ф = 25°

Vo = 25 m/s

consider x-motion using time of fight: x = Vox * t

where x = R = range

t = 2 Voy

R = Vo² sin (2Ф)

plugin values into the formula:

R = (25)² sin (2*25)

9.81

R = 48.81 m

therefore, the range or the ball is 48.81 m

4 0

3 years ago

Read 2 more answers