Question

Диаметр колеса велосипеда 70см.При езде колесо велосипеда за 1с совершает 1,5 оборота.Какова скорость велосипедиста в м/c ? Ответ округлите до десятых

Answer 1

Р=πd=219,8см

219,8*1,5=329,7см/с=3,3м/с

Answer 2

Calculation of the Cyclist's Speed

To calculate the speed of the cyclist, we need to determine the distance covered by the bicycle wheel in one second.

Given: - Diameter of the bicycle wheel: 70 cm - Number of revolutions made by the wheel in one second: 1.5 revolutions

To find the distance covered by the wheel in one revolution, we can use the formula:

Circumference of the wheel = π * Diameter of the wheel

Substituting the given diameter of 70 cm into the formula, we get:

Circumference of the wheel = π * 70 cm

Now, to find the distance covered by the wheel in one second, we multiply the circumference of the wheel by the number of revolutions made in one second:

Distance covered by the wheel in one second = Circumference of the wheel * Number of revolutions in one second

Let's calculate the speed of the cyclist using the given information:

import math

diameter = 70  # cm
revolutions_per_second = 1.5

circumference = math.pi * diameter
distance_per_second = circumference * revolutions_per_second

speed = distance_per_second  # cm/s

After performing the calculations, we find that the speed of the cyclist is approximately 329.867 cm/s. Rounded to the nearest tenth, the speed is 329.9 cm/s.

Please note that this calculation assumes that the bicycle wheel is rolling without slipping and that the speed is constant.