) ions). Average density at the surface is 1.025 kg/l. Seawater is denser than both fresh water and pure water (density 1.0 kg/l at 4 Â°C (39 Â°F)) because the dissolved salts increase the mass by a larger proportion than the volume. The freezing point of seawater decreases as salt concentration increases. At typical salinity, it freezes at about â2 Â°C (28 Â°F).
How does air resistance affect the acceleration of a falling object? As a falling object accelerates through air, its speed increases and air resistance increases. While gravity pulls the object down, we find that air resistance is trying t â¦ o limit the object's speed. Air resistance reduces the acceleration of a falling object. It would accelerate faster if it was falling in a vacuum.
It says that the mass of an object times its acceleration is equal to the sum of the forces acting on it. There are now two forces, gravity and air resistance. The force of gravity is the weight of the object: 9.8 * mass, directed downward. Air resistance can be handled in several ways; we choose the simplest. Assume the force of air resistance is proportional to velocity and in the opposite direction: k * velocity, where k is a negative constant. Differential Equation: Remember, mass * acceleration = gravity + air resistance. m*v'(t) = -9.8*m + k*v(t) In practice, k is determined by the size and shape of the object.