Question

1.7. Спортсмен мощностью 800 Вm натягивает тетиву лука . Какую работу он выполняет за 0,5 с? А.16000Дж. Б.6250 Дж В. 16 кДж Г.400Дж Д.4 кДж 2.1.что является единицей мощности ? А.Джоуль Б.Ньютон В.Ватт Г.Кг Д.Метр

Answer 1

1.7) Г
А = Р * t = 800 * 0,5 = 400 (Дж)
2.1) В
Ватт

Answer 2

Answer:

1.7. The work done by the athlete in pulling the bowstring can be calculated using the formula:

Work = Force x Distance

Given: - Power (Force) = 800 N - Distance = 0.5 m

Substituting the values into the formula, we get:

Work = 800 N x 0.5 m = 400 J

Therefore, the athlete performs 400 Joules of work in 0.5 seconds. The correct answer is (Г) 400 Дж. [[1]]

2.1. The unit of power is the Watt (W). The Watt is defined as the rate at which work is done or energy is transferred or converted. It is named after the Scottish engineer James Watt, who made significant contributions to the development of the steam engine. [[2]]