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  1. B

    Final mark?

    Thank you so much :)
  2. B

    Final mark?

    I just have a question that I'm hoping someone can help me with. I just finished a physics course where the final exam weighs at 40% of my final mark while the assignments weight at 60% which =100% total For my assignments I got a terrible 843.99 out of 1,408. I'm not quite sure what I got...
  3. B

    Work done and friction problem

    So it would be -888J?
  4. B

    Work done and friction problem

    What formula would I use to find the work done to overcome friction? I sort of understand but am still a bit confused
  5. B

    Work done and friction problem

    A force of 52 N is applied to a 12 kg mass resting on a bench where the force of sliding friction is 15 N. The work done in overcoming friction while moving the object 24 m is w=fd w=(37N)(24m) w=888J Does this procedure seem correct ? :) Thank you!
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    Height of stairs

    Thank you so much! :) :) :)
  7. B

    Height of stairs

    2375 J =mgh (65)(9.81)=637.65 2375J/637.65 =3.72?
  8. B

    Height of stairs

    h=(2375J)(9.81) ?
  9. B

    Height of stairs

    m=65 g=(9.81) (h)=? J= 2375 I sort of it get it but still not sure.. terrible at physics
  10. B

    Height of stairs

    Thank you :) so since 2375 J =mg(h) do I need to rearrange it so its h= ?
  11. B

    Height of stairs

    How do I find delta h?
  12. B

    Height of stairs

    I'm not quite sure that I get it :( So when I find the force that will be my height? This is the most confusing question to me lol
  13. B

    Height of stairs

    A 65.0 kg student climbs a set of stairs in 25.0 s with a power output of 95 W. What is the vertical height of the stairs? I came up with the formula: W=P x (delta t) W=95w(25.0s) 2375 Im not sure how this comes in to play: W = mg (delta h) Im really confused :|
  14. B

    Initial velocity

    Thanks! :) So.. a=-9.81m/s s=30.0m v=0 u2?? How would I find the initial velocity now?
  15. B

    Sound frequency

    Thank you SO much!! :D
  16. B

    Sound frequency

    t=d/s t=1.5km/ 345ms? t=4.35s?
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    Initial velocity

    final velocity?
  18. B

    Initial velocity

    It would decrease velocity? =)
  19. B

    Sound frequency

    245[hz] * 1.41[m] = 345 m/s? :)
  20. B

    Sound frequency

    A 245 Hz sound with a wavelength of 1.41 m is projected into a narrow canyon. If the canyon is 1.50 km long, what time does it take an echo to be heard? How would I solve for this question? :)
  21. B

    Initial velocity

    displacement? :\
  22. B

    Initial velocity

    the final velocity would be (30.0m) (-9.81)?
  23. B

    Initial velocity

    Thank you! :) one more question, how would I find the initial velocity? Would it be 0? or 9.81[m/s]^2? dont remember that part either :\
  24. B

    Initial velocity

    Hello :) I'm not given the time so I'm assuming its v^2=u^2+2as ?
  25. B

    Initial velocity

    What formula would I use to find the initial velocity? An object is thrown vertically into the air and reaches a height of 30.0 m. Neglecting air friction, what was the object’s initial velocity? I dont quite remember how to do this. Is it 30.0m / 9.81[m/s]^2?
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    Verticle height of stairs

    A 65.0 kg student climbs a set of stairs in 25.0 s with a power output of 95 W. What is the vertical height of the stairs? Im not quite sure where to start with this one?
  27. B

    Frequency and length

    thank you so much :):) I meant 4, I'm not sure why I put 2 lol
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