# Search results

1. ### Final mark?

Thank you so much :)
2. ### 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...

24m*15N=360?
4. ### Work done and friction problem

So it would be -888J?
5. ### 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
6. ### 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!
7. ### Height of stairs

Thank you so much! :) :) :)
8. ### Height of stairs

2375 J =mgh (65)(9.81)=637.65 2375J/637.65 =3.72?
9. ### Height of stairs

h=(2375J)(9.81) ?
10. ### Height of stairs

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

Thank you :) so since 2375 J =mg(h) do I need to rearrange it so its h= ?
12. ### Height of stairs

How do I find delta h?
13. ### 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
14. ### 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 :|

30*-9.81?
16. ### Initial velocity

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

Thank you SO much!! :D

0? :)
19. ### Sound frequency

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

final velocity?
21. ### Initial velocity

It would decrease velocity? =)
22. ### Sound frequency

245[hz] * 1.41[m] = 345 m/s? :)
23. ### 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? :)
24. ### Initial velocity

displacement? :\
25. ### Initial velocity

the final velocity would be (30.0m) (-9.81)?
26. ### 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 :\
27. ### Initial velocity

Hello :) I'm not given the time so I'm assuming its v^2=u^2+2as ?
28. ### 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?
29. ### 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?
30. ### Frequency and length

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