# 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
• 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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