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  1. Modern aeroplanes are propelled by jet engines. The air inside a jet engine , after heated to...

  2. ...1. The sensation of weightlessness on a roller coaster when the rider is propelled out of his or her seat. 2. What coaster enthusiasts...

  3. ...a large number of photons), the force F could be good enough to propel a small spacecraft to move in space under an acceleration. In fact, such principle...

  4. ...run on a very slippery road. Your feet won't be able to propel you forward. Q: 開槍會否失去後座力/射不出? The bullet could still...

  5. ...there is no vertical speed, but there is an horizontal speed of 52 m/s which propels Q to move throughout the whole journey. Hence, Q is ...

  6. ...in opposite direction. 5) When the rocket eject water/air, the reaction force will propel the rocket forward.

  7. ... the tyres onto the road. The rotation of the wheels thus propel the car to move forward. Even in braking, as long as the tyres...

  8. ...force. The reaction force, given by the ejected water to the rocket, propels the rocket to go up. (Newton's Third Law of Motion...

  9. ...interaction gives rise to a force (known as Lorentz force) that propels the electrons to move along the rod in a certain direction. This ...

  10. ... and floating tree trunks. Vehicles may be propelled or pulled by animals, for instance, a chariot, a stagecoach, a mule-...