18 marks b. When the lamp is not in use it takes 3 minutes to come to rest after being switched off, calculate the angul

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18 Marks B When The Lamp Is Not In Use It Takes 3 Minutes To Come To Rest After Being Switched Off Calculate The Angul 1 (140.03 KiB) Viewed 38 times

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18 Marks B When The Lamp Is Not In Use It Takes 3 Minutes To Come To Rest After Being Switched Off Calculate The Angul 2 (170.28 KiB) Viewed 38 times

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18 marks b. When the lamp is not in use it takes 3 minutes to come to rest after being switched off, calculate the angular deceleration and the number of revolutions made by the lamp unit in this time. [9 marks] Given that when the lamp is switched on it takes a torque of 250Nm to get the lamp up to its maximum speed of 10 rpm in 25 seconds, caleulate: c. The power needed to get the lamp up to this speed, [3 marks] d. The inertia of the lamp, [8 marks] e. The mass of the lamp, [6 marks] f. The kinetic energy of the lamp at this speed. [3 marks] Figure 2: Light house and Lamp unit.

3. a. A lamp unit in a lighthouse similar to that in Figure 2 rotates at 12 rpm given that the instantaneous tangential velocity of the lamp is 0.9 m/s calculate the diameter of the lamp. [8 marks] b. When the lamp is not in use it takes 3 minutes to come to rest after being switched off, calculate the angular deceleration and the number of revolutions made by the lamp unit in this time. [9 marks] Given that when the lamp is switched on it takes a torque of 250Nm to get the lamp up to its maximum speed of 10 rpm in 25 seconds, caleulate: c. The power needed to get the lamp up to this speed, [3 marks] d. The inertia of the lamp, [8 marks] e. The mass of the lamp, [6 marks] f. The kinetic energy of the lamp at this speed. [3 marks] Figure 2: Light house and Lamp unit.