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Ask Your Resident Physicist Questions

Discussion in 'Question & Answer' started by ID Zeta, Aug 5, 2017.

  1. ID Zeta

    ID Zeta Resident Physicist

    Solaire
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    Eh, every now and then, I try my hand at one.
     
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  2. luxuryluxray

    luxuryluxray make a wish!

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    Do you like drinking coffee? If yes, how much of it would you drink per day on average?

    Are there any mythical creatures you'd like to see in real life?
     
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  3. ID Zeta

    ID Zeta Resident Physicist

    Solaire
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    -Nope, not a fan of coffee. Soda, on the other hand...
    -Dragons would be both awesome and terrifying to see in real life.
     
  4. jeevan261001

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    Are you interested in Formula One at al?
     
  5. ID Zeta

    ID Zeta Resident Physicist

    Solaire
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    Eh, not really. I'm not a fan of racing in general. Just doesn't appeal to me.
     
  6. Calzone

    Calzone Banned

    Charmelion
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    How fast would a bus going down the road at 47miles hit the sign at the bottom if the hill was at an eighty two degree angle
     
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  7. ID Zeta

    ID Zeta Resident Physicist

    Solaire
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    We could use one of two kinematic equations to solve this:
    vf^2 = vi^2 + 2*a*d OR vf = vi + a*t, where vf is the bus' final velocity (what we're looking for), vi is its initial velocity, a is its acceleration, d is the bus' displacement (the distance down the hill it travels), and t is the time it takes for the bus to reach the sign at the bottom. a is dependent on the angle of the hill - specifically, a = g*sin(θ), where g is the acceleration due to gravity (9.81m/s^2). From the wording of the problem, we can assume vi = 47mph = 29.01 m/s and θ = 82 degrees.
    So vf = sqrt((29.01m/s)^2 + 2*9.81m/s^2*sin(82)*d) OR vf = 29.01m/s + 9.81m/s^2*sin(82)*t. Both should give us the same result.
    Unfortunately, we're not given d or t. If we don't have those, we cannot solve the problem.
     
  8. Calzone

    Calzone Banned

    Charmelion
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    The hill is 24feet long and it will hit the sigh innn 4.72 minutes
     
  9. ID Zeta

    ID Zeta Resident Physicist

    Solaire
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    vf = sqrt((29.01m/s)^2 + 2*9.81m/s^2*sin(82)*d) OR vf = 29.01m/s + 9.81m/s^2*sin(82)*t
    If we use d = 24ft = 7.32m, then: vf = sqrt((29.01m/s)^2 + 2*9.81m/s^2*sin(82)*7.32m) = 31.37m/s = 70.17mph.
    If we use t = 4.72min = 283.2s, then: vf = 29.01m/s + 9.81m/s^2*sin(82)*283.2s = 2780m/s = 6219mph.
    It's worth noting that these results assume a constant acceleration and a perfectly flat hill. If we're being realistic, a bus traveling at 47mph would cover a distance of 24 feet in way less than 4.72 minutes. Also, a hill with an 82 degree gradient is really frickin' steep.
     
  10. Gwoomy

    Gwoomy french goo

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    What’s your astrological sign? And your Chinese one?
    Do you like felines? What’s your favorite feline species?
     
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  11. ID Zeta

    ID Zeta Resident Physicist

    Solaire
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    -My astrological sign is Virgo (I think), and apparently I'm a Rat.
    -I'm generally indifferent to cats. In terms of species, tigers (particularly Siberian tigers) are pretty neat.
     
  12. Gwoomy

    Gwoomy french goo

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    What’s your favorite game involving one or several balls?
    Do you enjoy cooking?
    What’s your favorite fruit? your favorite vegetable?
     
  13. ID Zeta

    ID Zeta Resident Physicist

    Solaire
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    -I don't know if I've previously mebtuonedt this, but I'm an avid bowler.
    -I enjoy baking from time to time. Does that count?
    -To eat, my favorites are pretty bland (apples, oranges, grapes). To look at, the more exotic fruits (like dragonfruit) are interesting. For the veggies, that would be potatoes, but only because fries exist.
     
  14. SnowboundBecca

    SnowboundBecca Scarf Enthusiast

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    What's your favorite thing to bake?
     
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  15. ID Zeta

    ID Zeta Resident Physicist

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    Without a doubt, cookies... though Tollhouse squares are a close second.
     
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  16. Bubbles

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    What are your thoughts on volcanoes? Have you ever seen one in person?
     
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  17. ID Zeta

    ID Zeta Resident Physicist

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    I haven't seen one in person (I don't think...), but I think they're pretty neat. I'd kinda like to see an active one in person someday. I particularly like the ones whose ash clouds produce lightning.
     
  18. Strytho

    Strytho Giveaway Enthusiast

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  19. ID Zeta

    ID Zeta Resident Physicist

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    I know the basics. If you're asking me to explain it, I think I can give you a decent idea of what it is and how it works.
     
  20. Eclipse

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    :: Have you ever tried white chocolate? Do you enjoy it?

    :: What sorts of things help you to get to sleep at night (if you can't sleep or find it troublesome to do so)?

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