Recent content by heartOFphysic

  1. H

    Refractive index and depth of object in water.

    so it's (0.75)/ (1/1.333) = 0.99975 thus 1m?
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    Refractive index and depth of object in water.

    Question: A Fsherman sees a Fish in a river at an apparent depth below the surface of the water of 0.75 m. Given that the refractive index of water is 1.33, is the true depth of the Fish below the water's surface: A 0.75 m? B Less than 0.75 m? C 1 m? D More than 1 m? My proposal...
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    A rocket accelerates upwards Mechanics

    Hi, sorry if the the following is completely wrong (though do point it out if it is wrong)...but what about this. Since acceleration is a vector it can be resolved into components. so Vertical acceleration = 25 sin (80) = 24.62. now we will work out the displacement of the rocket while it...
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    Purchase a heater with a high resistance because P= I^2 R

    A current causes a heating effect!
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    Purchase a heater with a high resistance because P= I^2 R

    The current is alternating in a house supply, I guess?
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    Purchase a heater with a high resistance because P= I^2 R

    A student goes out to purchase an electric heater for his flat. The salesman says that, to get more heat, he should purchase a heater with a high resistance because P= I^2 R but the student thinks that a low resistance would be best, because P= V^2/R explain who is correct? Hmmm I'm...
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    What are the weights A and B in this system?

    am I right guys? anyone?
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    What are the weights A and B in this system?

    HELLO this questions interests me. Could you possibly go along this route. Let the 1Kg mass= W1, A= W2 and B=W3 then Let the tension in String 1 = F1 string 2= F2 and string3 =F3 (see THE IMAGE HERE OTHERWISE THE FOLLOWING WON'T MAKE SENSE) and so will F1=W1 F2 = W3 and F3=W2 Since...
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    Two trucks are around the pulley

    YES! I too am interested in knowing how you can "mathematically" work it out!
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    Two trucks are around the pulley

    how do you know they are accelerating at the same rate?
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    Two trucks are around the pulley

    LOL, that went slightly over my head, is it possible to simplify (ie just explain a bit more) this solution. what's "ground frame" and what's "have acc. a in direction left and right" Sorry for the inconvenience! :(
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    Two trucks are around the pulley

    (see image) How do I go about this? since a1 is larger, and the two trucks are around the pulley, then a2 is opposing (to some extent) so i thought the answer would be a1-a2? but I checked the answer and it's a1+a2/2 please help thank you :)
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    What is the component of weight along a ramp?

    anyone?
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    What is the component of weight along a ramp?

    I'm not quite sure what you mean, I can't picture this triangle at all- apologize for my ignorance! I know the only way I can arrive at half the weight is by the calculation sin30 X 7200 = 3200N or Cos60 X 7200 = 3200N
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    What is the component of weight along a ramp?

    (see image) Yes so I get that! and the Hypotenuse is parallel to the ramp. so using Sine= Opp/Hyp we get sin30= 7200N/Hyp Hyp= 7200/sin30 so Hypotenuse = 14400N? so I get double the weight not half the weight! :cry: