Question

Тело массой 5 кг свободно падает с высоты 80 м и в момент удара о землю его скорость достигает 30 м/с. Найти среднюю силу сопротивления воздуха. ПОМОГИТЕ,ПОЖАЛУЙСТА. СРОЧНО!!!!!!

Answer 1

Ответ:

Объяснение:

дано   m=5 кг

h=80 м

V=30 м/с

Fс- ?

mgh+ Аc=mV^2/2      Аc=-Fс*h

Fc*h=mgh-mV^2/2

Fc=mg- mV^2/2h=50-5*900/160=21.875 Н  

Answer 2

Calculation of Average Air Resistance Force

To find the average air resistance force acting on the body, we can use the following equation:

F_air = (m * g - m * a) / t

Where: - F_air is the average air resistance force - m is the mass of the body (5 kg) - g is the acceleration due to gravity (9.8 m/s^2) - a is the acceleration of the body (which can be calculated using the equation of motion: v^2 = u^2 + 2as, where v is the final velocity, u is the initial velocity, s is the distance, and a is the acceleration) - t is the time taken for the body to fall from the given height (which can be calculated using the equation of motion: s = ut + (1/2)at^2)

Let's calculate the average air resistance force step by step:

1. Calculate the time taken for the body to fall from the given height: - Using the equation of motion: s = ut + (1/2)at^2 - Given: initial velocity (u) = 0 m/s, distance (s) = 80 m, acceleration (a) = acceleration due to gravity (g) = 9.8 m/s^2 - Rearranging the equation: t = sqrt((2s) / a) - Substituting the values: t = sqrt((2 * 80) / 9.8) ≈ 4.04 s

2. Calculate the acceleration of the body: - Using the equation of motion: v^2 = u^2 + 2as - Given: initial velocity (u) = 0 m/s, final velocity (v) = 30 m/s, distance (s) = 80 m - Rearranging the equation: a = (v^2 - u^2) / (2s) - Substituting the values: a = (30^2 - 0^2) / (2 * 80) ≈ 1.875 m/s^2

3. Calculate the average air resistance force: - Using the equation: F_air = (m * g - m * a) / t - Substituting the values: F_air = (5 * 9.8 - 5 * 1.875) / 4.04 ≈ 8.05 N

Therefore, the average air resistance force acting on the body is approximately 8.05 N.

Please note that this calculation assumes that the air resistance force remains constant throughout the fall, which may not be entirely accurate in real-world scenarios.