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  1. T

    Reflection of light

    Homework Statement A person stands 3.6m in front of a wall that is covered floor to ceiling with a plane mirror. His eyes are 1.8m above the floor. He holds a flashlight between his feet and manages to point it at the mirror. At what angel of incidence must the light strike the mirror so...
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    Battery problem

    I got the total resistance to be 8. The total current to be 1.5 because 12/8=1.5, now how do I get the voltage drops?
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    Battery problem

    I got the total resistance and it's 8. How do I calculate the current through each resistor not the total current.
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    Battery problem

    Homework Statement A schematic diagram incorporates a 12V battery in series with a 3.0 ohm resistor. The current then flows through 12 ohm and 4.0 ohm resistors in parallel with each other. a) calculate the current through and voltage across each resistor. 3.0ohm 4.0 ohm 12ohm 24ohm 4.8 ohm...
  5. T

    Diving Board Question

    F2r+-wr=F2(2.1)+-710(4)=280/2.1=1352.38
  6. T

    Diving Board Question

    I got the answer to be 1352.38N
  7. T

    Diving Board Question

    I just got the answer thanks
  8. T

    Diving Board Question

    and this leads back to my main question of whether or not when using W to find F2 if I add the person and the board together to get 710 or do I do something different witht the two weights
  9. T

    Diving Board Question

    F1 is the bolt force F2 is the fulcrumforce W1 is the person weight W2 is the board weight
  10. T

    Diving Board Question

    Im sorry, I do not know either F2 or F1 therefore I cant use that equation can I?
  11. T

    Diving Board Question

    I'm only looking for the force that the fulcrum exerts and I thought I had to use the torque equation in order to find it with what I am given, or am I mistaken? by 710 I meant the combined weight of the person and the board.
  12. T

    Diving Board Question

    Im not sure if I have to add both weights and if so I dont know if I am adding them to the right spots. Q) A 596N diver is standing at the edge of a diving board, 1.9m from the fulcrum of a 114N diving board. The fulcrum is located 2.1m from where it is bolted at the opposite end Find the...
  13. T

    One more impulse problem Hopefully

    a good bunter pulls the bat back right as contact is made with the ball. Why is this so? 1 This action decreases the impulse of the bat on the ball 2 This action increases the impulse of the bat on the ball 3 This action increases the average force of the bat on the ball 4 This action...
  14. T

    Impulse question

    Hey its alright, thanks a lot for the help I really appreciate it
  15. T

    Impulse question

    When I look at this problem I still see the answer being that the sand and water exert the same impulses but the sand exerts greater average force. This is because larger force but less time and therefore smaller force but more time for water. What is the error in my logic?
  16. T

    Impulse question

    Can anyone help me with what the real answer is???? Because now im kinda lost
  17. T

    Impulse question

    No this is the only given information. Could you explain to me why C is incorrect please
  18. T

    Impulse question

    and obviously the greater force is due to the lower time which together equal the waters impulse which has longer time and lower force
  19. T

    Impulse question

    Based upon this information wouldnt you think the answer would be C)The sand and water exert the same impulse, but the sand exerts a greater average force This seems to work with what you stated
  20. T

    Impulse question

    I believe it is or am i missing something big
  21. T

    Impulse question

    The correct answer is B) Water exerts a greater impulse than the sand because time is larger for the water Correct?
  22. T

    Impulse question

    This therefore means that the correct answer would be B correct?
  23. T

    Impulse question

    J=F change T= change P= m change V sand stops you more quickly
  24. T

    Impulse question

    Jumping onto sand vs. jumping into water results in which of the following as each substance brings you to a halt? a) The sand exerts a greater impulse than the water b) The water exerts a greater impulse than the sand c) The sand and water exert the same impulse, but the sand exerts a...
  25. T

    Force Question

    Alright sorry about that and thanks a lot I appreciate the advice
  26. T

    Force Question

    A hockey goalie m=85kg stands in front of the net. A player hits the 0.15kg puck towards the goalie with a velocity of +59m/s. The goalie catches the puck with his glove in a time of 0.0021seconds. (assume all collisions are linear) A) what is the average force of the puck on the goalie? I...
  27. T

    A couple of questions

    This therefore means that the answer has to be B right? Because therefore the momentum for the sled is the same or am I wrong?
  28. T

    A couple of questions

    It's constant right
  29. T

    A couple of questions

    I have no idea how to do this first one 1. Youre coasting with a friend on a sled, going a constant velocity, having a momentum of +120kg m/s when suddenly your friend bails off the sled. Assuming there are no net external forces acting on the system which of the following gives a correct...
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