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How a submarine works

 1.Diving and Surfacing (Ballast System) Submarines control their depth using ballast tanks. To dive: The tanks fill with water, making the submarine heavier, so it sinks. To rise (surface): The tanks are filled with compressed air, pushing the water out, making the submarine lighter, so it floats up. Principle used: Buoyancy (Archimedes’ Principle) 2. Moving Forward (Propulsion System) Submarines use propellers powered by engines. Diesel-electric submarines: Use diesel engines on the surface and electric batteries underwater. Nuclear submarines: Use nuclear reactors to produce heat → steam → electricity → movement. This allows them to travel very fast and for months without refueling. 3. Steering and Control (Fins & Rudders) Submarines use: Rudders – turn left or right Hydroplanes (fins) – move up or down underwater These help in precise underwater navigation. 4. Breathing Underwater (Air System) Submarines don’t take in outside air when underwater. They: Recycle oxygen Remove...
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5 Hidden Android Tricks to Boost Your Phone Speed Instantly

 Is your Android phone slowing down? You don’t need expensive apps or a new device — just use these 5 simple tricks to make your phone run like new. DomiDigitals 1. Clear Cached Data Regularly Apps store temporary files that pile up over time. Go to Settings → Storage → Cached data → Clear. Do this once a week to keep performance smooth. 2. Turn Off Auto-Updates for Heavy Apps Google Play Store updates in the background and eats memory. Open Play Store → Settings → Auto-update apps → Select “Over Wi-Fi only” or “Don’t auto-update.” Manually update when necessary. 3. Disable or Uninstall Unused Apps If you haven’t opened an app in months, it’s slowing your phone down. Go to Settings → Apps → Select app → Disable or Uninstall 4. Reduce Animations (Developer Options) Animations make your phone pretty but slower. Go to Settings → About phone → Tap “Build Number” 7 times → Enable Developer Options Set Window, Transition, Animator scale to 0.5x or Off. 5. Restart Your Phone Every Few Day...
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