Question

Автомобиль массой 1000 кг уменьшил скорость от 20м/с до 10м/с. Определите работу равнодействующей всех сил, действующих на автомобиль. СРОЧНО И ПОЖАЛУЙСТА С ДАНО И РЕШЕНИЕ!!!!!​

Answer 1

Ответ:

Объяснение:

Дано:

m = 1000 кг

V₁ = 20 м/с

V₂ = 10 м/с

__________

A - ?

По теореме о кинетической энергии:

A = Eк₁ - Eк₂

A = m·V₁²/2 - m₂·V₂²/2

A = (m/2)·(V² - V²)

A = (1000/2)·(20² - 10²) = 150 000 Дж   или  150 кДж

Answer 2

Дано:

m = 1000 кг

v₁ = 20 м/с

v₂ = 10 м/с

Найти A.

Решение:

F = m·a,

$a_x = \frac{v_2 - v_1}{\Delta t}$

$a = |a_x| = \frac{v_1 - v_2}{\Delta t}$

$A = F\cdot s\cdot \cos(180^\circ) = - m\cdot a\cdot s$

$s = v_1\cdot\Delta t + \frac{a_x\cdot (\Delta t)^2}{2}$

$s = v_1\cdot\Delta t + \frac{v_2 - v_1}{\Delta t}\cdot \frac{(\Delta t)^2}{2}$

$s = v_1\cdot\Delta t + \frac{(v_2 - v_1)\cdot \Delta t}{2} =$

$= \frac{2v_1 + v_2 - v_1}{2}\cdot\Delta t = \frac{v_1 + v_2}{2}\cdot\Delta t$

$A = -m\cdot\frac{v_1 - v_2}{\Delta t}\cdot\frac{v_1 + v_2}{2}\cdot\Delta t =$

$= -m\cdot (v_1 - v_2)\frac{v_1 + v_2}{2}$

A = -1000кг·10м/с·15м/с = -150000 Дж

Answer 3

Calculation of Work Done on the Car

To calculate the work done on the car, we can use the formula:

Work = Force × Distance

First, we need to find the net force acting on the car. The net force can be calculated using the formula:

Net Force = Mass × (Final Velocity - Initial Velocity) / Time

Given: - Mass of the car (m) = 1000 kg - Initial velocity (u) = 20 m/s - Final velocity (v) = 10 m/s - Time is not provided, so we'll assume the time interval is 1 second for simplicity.

Using these values, we can calculate the net force acting on the car.

Net Force = 1000 kg × (10 m/s - 20 m/s) / 1 s

Net Force = 1000 kg × (-10 m/s) = -10,000 N

The negative sign indicates that the force is acting in the opposite direction of the car's motion.

Now that we have the net force, we can calculate the work done on the car using the formula:

Work = Force × Distance

However, the distance traveled by the car is not provided, so we cannot calculate the exact work done without this information. If the distance traveled is provided, we can use the above formula to calculate the work done on the car.

If you have the distance traveled by the car, please provide it so we can calculate the work done.