physics

physics
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  • In the kinematics department of NASA
  • Jane, you're not gonna like this! Look!
  • Oh no, an asteroid is headed for Earth! We have to stop it
  • d= v x t
  • We are all going to die!
  • Hmm... If we can calculate how long we have, we could stop the asteroid before it strikes
  • USE THE IDIOT TRIANGLE! 
  •  Okay, we know the asteroid is about 2000 km away, and the velocity is 1m/s[Towards the earth]. But how can we calculate the time?
  • 2000km 
  • Jane realizes with the help of her co-worker that they need to use one of the five kinematic equations
  • v
  • What about acceleration? 
  • d
  • t
  • d= 2 000 000m  v=1 m/s t=?
  • t= 2 000 000 1
  • t= 2 000 000s
  • t=d    v
  • Phewf... we have around 23 days 
  • We don't have acceleration!
  • Yes! Thanks! The equation for acceleration is d= v1t+1/2at^2  We have to rearrange for 'a' and solve-
  • John realizes for the first time since joining NASA that a vector is a quantity that includes magnitude, is measured in units, and has s direction.   
  • Maybe we miscalculated?
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