Pre-Medical Physics Exam Prep
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Pre-Medical Physics Exam Prep
Sample questions with model answers
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A disc rotates about a fixed axis. Its angular velocity $\omega$ varies with time according to the equation $\omega = at + b$. Initially at $t = 0$ its angular velocity is $1.0$ rad/s and angular position is $2$ rad; at the instant $t = 2$ s, angular velocity is $5.0$ rad/s. Determine angular position $\theta$ and angular acceleration $\alpha$ when $t = 4$ s.
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Angular position $\theta = 14$ rad, angular acceleration $\alpha = 2.0$ rad/s$^2$.
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A wheel of radius $1.5$ m is rotating at a constant angular acceleration of $10$ rad/s$^2$. Its initial angular speed is $\left(\frac{60}{\pi}\right)$ rpm. What will be its angular speed and angular displacement at $t = 2.0$ s?
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Angular speed $\omega = 20$ rad/s, angular displacement $\theta = 30$ rad.
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A rigid body rotates about a fixed axis with variable angular speed $\omega = A - Bt$ where A and B are constant. Find the angle through which it rotates before it comes to rest.
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Angle $\theta = \frac{A^2}{2B}$.
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A car has wheels of radius $0.30$ m and is travelling at $36$ m/s. Calculate :-
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Angular speed $\omega = 120$ rad/s.
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