Answer:
Explanation:
At the time of a body achieving terminal velocity, the drag force becomes equal to the weight of the body less the buoyant force by the surrounding medium which can be represented by the following equation
Where r is radius of the body , d is density of the material of the body σ is density of the medium and n is coefficient of viscosity of the medium and v is terminal velocity.
Simplifying
v =
Assuming the value of density of air as 1.225 kg/m³ and putting other given values in the formula we get
v = [/tex]
v = 387 x 10⁻⁵ m/s
Terminal velocity = 387 x 10⁻⁵ m/s
Time taken to fall a distance of 100 m
=
= 2.6 x 10⁴ s.
Seeds Is not a fatty acid
Answer:
2
Explanation:
there are 2 significant figures in there
Answer:
True. Massive objects, attract other objects more than those with less mass
Explanation:
We can analyze the formula of the law of universal gravitation proposed by Newton. This formula has the following variables.
Let's suppose an asteroid that is passing through the solar system and in some moment the earth is very near to its trajectory.
The mass of the asteroid is m1 = 1000 [kg]
The mass of the earth is m2 = 5,972E24 [kg]
the distance between the asteroid is r = 150000[km]
Therefor the force exerted by the earth over the asteroid is:
[/tex]
Now the force exerted by the sun.
The mass of the asteroid is m1 = 1000 [kg]
The mass of the earth is m2 = 1,98 E 30 [kg]
the distance between the asteroid is r = 149 600 000 [km]
This example shows that at the same distance objects with more mass can exert more force than objects with lesser mass.
By Newton's second law, the car slows down with an average acceleration a such that
-7100 N = (1500 kg) a ⇒ a ≈ -4.7 m/s²
If we treat the car as accelerating uniformly with this magnitude, then the car slides a distance ∆x such that
0² - (25 m/s)² = 2a ∆x ⇒ ∆x ≈ 66 m