Question

Эскалатор метро за 1 мин поднимает 60 пассажиров на высоту 20 м. Сравните мощность экскалатора с мощностью легкового автомобиля, приняв для оценки массу пасажира 70 кг, а мощность автомобиля 70кВт.

Answer 1

P = A/t
A1= ∑m*g*h; => P1= N*m*g*h/t, где N- количество пассажиров, m -масса одного пассажира,g- ускорение свободного падения, h- высота подъема пассажиров, t- время работы эскалатора.
P1= 60*70*10*20/60=14*10³ W,
P2= 70*10³ W
P2/P1=70/14=5.
Ответ: мощность авто в 5 раз больше

Answer 2

Comparing the Power of an Escalator and a Car

To compare the power of an escalator and a car, we need to consider the work done by each in a given time period. The power of a machine is the rate at which it does work, which is calculated as the work done divided by the time taken.

Let's calculate the power of the escalator and the car separately and then compare them.

Power of the Escalator

Given: - The escalator lifts 60 passengers to a height of 20 meters in 1 minute.

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

Work = Force x Distance

The force exerted by the escalator is the weight of the passengers it lifts. Assuming an average passenger weight of 70 kg, the force exerted by the escalator is:

**Force =