Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

joshi

  • 2 years ago

A wet bar of soap (m= 0.150 kg) slides down a ramp 2.0m long at an angle of 7.3 degrees. How long does it take to reach the bottom?

  • This Question is Closed
  1. Taguja
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Since it is a wet bar of soap, I assume there is no friction. If we draw the forces diagram, we found that there is a resultant force of the normal reaction N and the gravitational force F=mg and that F=mgsin(alpha). That force is equal to F=ma, therefore mgsin(alpha)=ma=>a=gsin(alpha). From the equation t=sqrt(2x/a), we get that t is approximately 1,8 seconds. Keep in mind that this is actually independent of the mass of the body.

  2. joshi
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ohhhh i did F=mgcos. could you explain why it's sin? also thanks

  3. joshi
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    no the answer is infact 1.8 ...

  4. Taguja
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Oh yeah.. Now i forgot taking the square root LOL... 1,8 seconds is infact the right answer. I hope that this sketch helps you :P

    1 Attachment
  5. joshi
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ohhh i see, i calculated a y component for gravity as well which doesn't really exist in this case. well anyway, thanks! :)

  6. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.