To throw a discus, the thrower holds it with a fully outstretched arm. Starting from...

Lennie Davis

Lennie Davis

Answered

2021-12-22

To throw a discus, the thrower holds it with a fully outstretched arm. Starting from rest, he begins to turn with a constant angular acceleration, releasing the discuss after making one complete revolution. The diameter of the circle in which the discus moves is about 1.8 m. If the thrower takes 1.0 s to complete one revolution, starting from rest, what will be the speed of the discus at release?

Answer & Explanation

Jimmy Macias

Jimmy Macias

Expert

2021-12-23Added 30 answers

We have 2r=1.8 mt=1 s 
The discus starts to move from the state of rest v0=0rads 
And we have the expression: 
θ=ω0t+12+12αt2 
θ=0+12αt2 
Thrower performs a circular motion during movement, so θ=2π 
α=2θt2 
α=22π1s2 
α=4πrads2 
α=43.14rads2 
α=12.56rads2 
The speed of the discus at release is: 
v=rω  
v=11.3ms

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