Question

СРОЧНО.20 БАЛЛОВ.Сила 500 Н, плотность тела 1000 кг/м , а его объем 40 м . Найти начальную скорость тела, если за 10 секунд оно разогналось до 30 км/ч.

Answer 1

Ответ:

29,875км/ч

Объяснение:

Найдём массу тела: m = pV = 1000 * 40 = 40000кг

Ищем ускорение: a = F/m = 500/40000 =0,0125м/с²

Зная ускорение, скорость и время, ищем начальную скорость:

a = (v - v₀)/t

0,0125 = (30 - v₀)/10

0,125 = 30 - v₀

v₀ = 30 - 0,125

v₀ = 29,875км/ч

Answer 2

Calculation of Initial Velocity

To find the initial velocity of the object, we can use the formula:

Final Velocity = Initial Velocity + (Acceleration x Time)

In this case, the final velocity is given as 30 km/h, the acceleration can be calculated using Newton's second law of motion:

Force = Mass x Acceleration

Given that the force is 500 N and the density of the object is 1000 kg/m³, we can calculate the mass of the object using the formula:

Mass = Density x Volume

Now, let's calculate the initial velocity step by step.

1. Calculate the mass of the object: - Density = 1000 kg/m³ - Volume = 40 m³ - Mass = Density x Volume

Mass = 1000 kg/m³ x 40 m³

2. Calculate the acceleration of the object: - Force = 500 N - Mass = Calculated in step 1 - Acceleration = Force / Mass

Acceleration = 500 N / Calculated Mass

3. Convert the final velocity from km/h to m/s: - Final Velocity = 30 km/h - Conversion: 1 km/h = 0.2778 m/s

Final Velocity = 30 km/h x 0.2778 m/s

4. Rearrange the formula to solve for the initial velocity: - Final Velocity = Initial Velocity + (Acceleration x Time) - Initial Velocity = Final Velocity - (Acceleration x Time)

Initial Velocity = Calculated Final Velocity - (Calculated Acceleration x 10 seconds)

Let's calculate the values step by step using the given data:

1. Calculate the mass: - Mass = 1000 kg/m³ x 40 m³

2. Calculate the acceleration: - Acceleration = 500 N / Calculated Mass

3. Convert the final velocity: - Final Velocity = 30 km/h x 0.2778 m/s

4. Calculate the initial velocity: - Initial Velocity = Calculated Final Velocity - (Calculated Acceleration x 10 seconds)

Now, let's calculate the values.