Question

Машина равномерно движется со скоростью 72км/ч.Какую работу совершит она за 10 с,если сила тяги ее мотора 2000 Н?

Answer 1

Машина равномерно движется со скоростью 72км/ч.Какую работу совершит она за 10 с,если сила тяги ее мотора 2000 Н?


Дано V=72 км/ч=20 м/с    F=2000 Н   t=10 с   
А - ?

A=F*S=F*V*t=2000*20*10=400 000 Дж=400 кДж

Ответ A=400 кДж

Answer 2

Calculation of Work Done by the Car

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

Work = Force x Distance

In this case, the force is the thrust force exerted by the car's motor, which is given as 2000 N. The distance traveled by the car can be calculated using the formula:

Distance = Speed x Time

The speed of the car is given as 72 km/h, which can be converted to m/s by dividing it by 3.6. The time is given as 10 s.

Let's calculate the distance and then use it to find the work done by the car.

Calculation Steps:

1. Convert the speed from km/h to m/s: - 72 km/h ÷ 3.6 = 20 m/s.

2. Calculate the distance traveled by the car: - Distance = Speed x Time - Distance = 20 m/s x 10 s = 200 m.

3. Calculate the work done by the car: - Work = Force x Distance - Work = 2000 N x 200 m = 400,000 J.

Therefore, the car will perform 400,000 Joules of work in 10 seconds, given that the force of its motor is 2000 N and it is moving at a constant speed of 72 km/h.

Please let me know if there's anything else I can help you with!