Question

Найдите механическую работу, необходимую для увеличения скорости автомобиля мас­сой m= 1600 кг на дельтаv = 18 км/ч: а) от 18 до 36 км/ч; 6) от 36 до 54 км/ч. помогите пожалуйста))

Answer 1

Вот решение  ! :) .......

Answer 2

Calculation of Mechanical Work

To calculate the mechanical work required to increase the speed of a car, we can use the formula:

Work = (1/2) * mass * (final velocity^2 - initial velocity^2)

Given: - Mass of the car (m) = 1600 kg - Change in velocity (Δv) = 18 km/h

We need to calculate the work required for two scenarios: a) From 18 km/h to 36 km/h b) From 36 km/h to 54 km/h

Let's calculate the work for each scenario.

a) From 18 km/h to 36 km/h

First, we need to convert the velocities from km/h to m/s, as the formula requires velocities in meters per second.

Initial velocity (v1) = 18 km/h = 5 m/s (conversion factor: 1 km/h = 0.2778 m/s) Final velocity (v2) = 36 km/h = 10 m/s

Using the formula for work, we can calculate the work required:

Work = (1/2) * mass * (v2^2 - v1^2)

Substituting the values:

Work = (1/2) * 1600 kg * (10 m/s)^2 - (5 m/s)^2

Simplifying the equation:

Work = (1/2) * 1600 kg * (100 m^2/s^2 - 25 m^2/s^2)

Work = (1/2) * 1600 kg * 75 m^2/s^2

Work = 60,000 Joules

Therefore, the mechanical work required to increase the speed of the car from 18 km/h to 36 km/h