An astronaut is being tested in a centrifuge. The centrifuge has a radius of 12.0 m and, in starting, rotates according to θ = 0.370t2, where t is in seconds and θ is in radians. When t = 5.00 s, what are the magnitudes of the astronaut's
(a) angular velocity,
(b) linear velocity,
(c) tangential acceleration, and
(d) radial acceleration?

Answer :

Answer:

part a)

[tex]\omega = 3.7 rad/s[/tex]

Part b)

v = 44.4 m/s

Part c)

[tex]a_t = 8.88 m/s^2[/tex]

Part d)

[tex]a_r = 164.3 m/s^2[/tex]

Explanation:

As we know that the angle at any instant of time is given as

[tex]\theta = 0.370 t^2[/tex]

part a)

as we know that rate of change in angle with time is angular speed

so here we have

[tex]\omega = \frac{d\theta}{dt}[/tex]

[tex]\omega = \frac{d}{dt}(0.370 t^2)[/tex]

[tex]\omega = 0.74 t[/tex]

at t= 5s we will have

[tex]\omega = (0.74)(5) = 3.7 rad/s[/tex]

Part b)

as we know the relation between linear speed and angular speed is given as

[tex]v = R\omega[/tex]

[tex]v = (12.0)(3.7) [/tex]

v = 44.4 m/s

Part c)

now in order to find angular acceleration we know that

[tex]\alpha = \frac{d\omega}{dt}[/tex]

[tex]\alpha = \frac{d(0.74 t)}{dt} [/tex]

[tex]\alpha = 0.74 rad/s^2[/tex]

now tangential acceleration is given as

[tex]a_t = R\alpha[/tex]

[tex]a_t = 12.0(0.74) [/tex]

[tex]a_t = 8.88 m/s^2[/tex]

Part d)

radial acceleration is given as

[tex]a_r = \frac{v^2}{R}[/tex]

[tex]a_r = \frac{44.4^2}{12}[/tex]

[tex]a_r = 164.3 m/s^2[/tex]

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