Question

Автомобиль массой 2000 кг движется с постоянной скоростью 3 м/с по горизонтальному участку шоссе. Какова работа, совершённая силой тяжести, действующей на автомобиль, за 5 секунд движения?

Answer 1

Ответ: 300кДж

Объяснение:

Дано:

m=2000кг

V=3м/с

t=5c

--------------

А-?

А=FS=m*g*V*t=2000*10*3*5=300000Дж=300кДж

Answer 2

Calculation of Work Done by the Force of Gravity

To calculate the work done by the force of gravity on the car, we need to know the mass of the car, the acceleration due to gravity, and the distance traveled.

Given: - Mass of the car = 2000 kg - Speed of the car = 3 m/s - Time taken = 5 seconds

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

Work = Force x Distance

The force of gravity acting on the car can be calculated using the formula:

Force = Mass x Acceleration due to gravity

The acceleration due to gravity is approximately 9.8 m/s^2.

Let's calculate the force of gravity first:

Force = 2000 kg x 9.8 m/s^2

Using the given mass of the car, we can calculate the force of gravity to be 19,600 N.

Next, we need to calculate the distance traveled by the car. Since the car is moving at a constant speed, the distance traveled can be calculated using the formula:

Distance = Speed x Time

Distance = 3 m/s x 5 s

The distance traveled by the car is 15 meters.

Now, we can calculate the work done by the force of gravity:

Work = Force x Distance

Work = 19,600 N x 15 m

Using the given values, we can calculate the work done by the force of gravity to be 294,000 Joules.

Therefore, the work done by the force of gravity on the car, during the 5 seconds of movement, is 294,000 Joules.