# Search results

1. ### Work done dissipated as heat (object moving up a plane)

Thank you echild for the help, I fully understand it now.
2. ### Work done dissipated as heat (object moving up a plane)

I found out how to get the answer, but I still don't get how there is no work done in moving the object from the bottom to the top.
3. ### Work done dissipated as heat (object moving up a plane)

I don't understand how to solve this. How do you find out how much of the work done is dissipated as heat?
4. ### Work done dissipated as heat (object moving up a plane)

Homework Statement I have attached the question. Homework Equations W=Fd The Attempt at a Solution I get the answer as 240, but the correct answer is 120. What I did was get the component of the weight using mgsinθ = 6, then 6x40. The answer says you need to do 360-240=120...
5. ### Probability of MCQ

Homework Statement This question isn't in a book, but I want to know the answer for myself. Q. If I take an MCQ test with 40 questions, each question has 4 possible answers with only one being correct, what is the probability of getting 40/40 in the test by guessing? I've tried solving...
6. ### Find acceleration of a ball

I finally found it. I used this equation s=h u=at1 v=at2 t=(t2-t1) \frac{s}{t}=\frac{u+v}{2}
7. ### Find acceleration of a ball

I'm sorry, I still don't get it. How do you solve this question?
8. ### Find acceleration of a ball

The question is attached. The correct answer is D I got it as C first using the equation s=ut+1/2 a t^2 I took s as h, and t= (t2-t1) I put u=0, which I discovered isn't correct. I then tried putting u=at1 and got a complex equation and got stuck there.
9. ### Mechanics - find the coefficient of friction

Thank you PhantomJay for the help. I forgot to include the vertical component of the horizontal force when calculating R, which affected my final answer.
10. ### Mechanics - find the coefficient of friction

Homework Statement A horizontal force of 2 N is just sufficient to prevent a block of mass 1 kg from sliding down a rough plane inclined at arcsin \frac{7}{25} to the horizontal. Find the coefficient of friction between the block and the plane and the acceleration with which the block will move...