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 July 14th, 2016, 02:25 PM #1 Newbie   Joined: Jul 2016 From: Brazil Posts: 1 Thanks: 0 physics calculation, help me please! A car starts a curve with speed 50km / h. This curve is an arc of circumference with radius of 10 m. If it takes 10 seconds to describe this curve, and is a constant acceleration of 0.8 m / s, calculate: a) the angular velocity curve beginning and at the end thereof; b) Distance traveled this curve; c) Angle described the car; d) angular acceleration; e) centripetal acceleration at the beginning of the path; July 14th, 2016, 03:46 PM #2 Math Team   Joined: Jul 2011 From: Texas Posts: 2,843 Thanks: 1484 first, you need to convert the initial tangential velocity, $v_{0} = 50 \, km/hr$ to $m/s$ (a) ... $\omega_0 = r \cdot v_{0}$ assuming the given constant acceleration is tangential to the curve ... $v_{f} = v_{0} + a_T \cdot \Delta t$ and $\omega_f = r \cdot v_{f}$ (b) ... $\Delta s = r \cdot \bar{\omega} \cdot \Delta t = r \left(\dfrac{\omega_0+\omega_f}{2}\right) \cdot \Delta t$ (c) ... $\Delta \theta = \dfrac{\Delta s}{r}$ (d) ... $\alpha = \dfrac{\Delta \omega}{\Delta t}$ (e) ... $a_c = \dfrac{v_0^2}{r} = r \cdot \omega_0^2$ Thanks from topsquark and manus July 14th, 2016, 06:16 PM   #3
Math Team

Joined: Jul 2011
From: Texas

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Thanks: 1484

Quote:
 Originally Posted by skeeter first, you need to convert the initial tangential velocity, $v_{0} = 50 \, km/hr$ to $m/s$ (a) ... $\omega_0 = \dfrac{v_{0}}{r}$ assuming the given constant acceleration is tangential to the curve ... $v_{f} = v_{0} + a_T \cdot \Delta t$ and $\omega_f = \dfrac{v_{f}}{r}$ (b) ... $\Delta s = r \cdot \bar{\omega} \cdot \Delta t = r \left(\dfrac{\omega_0+\omega_f}{2}\right) \cdot \Delta t$ (c) ... $\Delta \theta = \dfrac{\Delta s}{r}$ (d) ... $\alpha = \dfrac{\Delta \omega}{\Delta t}$ (e) ... $a_c = \dfrac{v_0^2}{r} = r \cdot \omega_0^2$
couple of corrections for part (a) ... sorry Tags calculation, physics Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post GreenBeast Physics 16 April 8th, 2016 06:16 AM joskevermeulen Calculus 1 December 29th, 2015 05:02 AM duckfan1 Physics 1 November 17th, 2010 07:24 PM shawdub Physics 1 October 29th, 2010 05:11 PM johnny New Users 0 March 17th, 2008 04:46 PM

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