When we walk, our legs alternatively swing forward about the hip joint as a pivot. In this motion the leg is acting approximately as a physical pendulum. Treating the leg as a thin uniform rod of length 0.80 m, find the time it takes for the leg to swing forward.

0.3 seconds

Explanation:

When we walk, our legs alternatively swing forward about the hip joint as a pivot. In this motion the leg is acting approximately as a physical pendulum. Treating the leg as a thin uniform rod of length 0.80 m,

To find the time it takes for the leg to swing forward, where g = 9.8 m/s^2

Let's use the simple pendulum formula which says that:

T = 2π( sqrt ( L/g))

T = 2π[sqrt (0.8/9.8)]

T = 2π × 0.082

T = 0.5129

For the leg to swing forward only, the number of complete oscillations will be half.

Period T = time t ÷ number of complete oscillations. That is,

T = t ÷ 1/2

0.5129 = t ÷ 1/2

t = 0.5129 × 1/2

Time t = 0.256 seconds.

Therefore, the time it takes for the leg to swing forward is 0.3 seconds approximately

found in the nucleus

has mass of one amu

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.