There are 2.0 x 10^3 pounds in a ton. The Hoover dam located on the Colorado river between Arizona and Nevada was made with 6.6×10^6 tons of concrete. how many pounds of concrete were used to create the Hoover dam?

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Ответ:

sheram2010

08.07.2022

Physics

$1.875\ rad/s^2, 8\ s$

Explanation:

Given

Radius of disc $r=10\ cm$

Angle turned $\theta=60\ rad$

Initial angular velocity $\omega_0=0$

Final angular velocity $\omega_f=15\ rad/s$

using $\omega^2-\omega_o^2=2\alpha \cdot \theta$

Substitute values

$\Rightarrow 15^2-0=2\times \alpha \times 60\\\Rightarrow \alpha=1.875\ rad/s^2$

using $\omega=\omega_o+\alpha t$

Substitute values

$\Rightarrow 15=0+1.875\times t\\\Rightarrow t=8\ s$

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