Vertical Circles/Work-related Physics

  • #1
What formula do i apply to the following/theories?

(1) a 0.30 kg mass attached to the end of a string swings in a vertical circle (R=1.6m). At an instant when theta=50 degrees, the tension in the string is 8.0N. what is the magnitude of the resultant force on the mass at this instant?

(2) a 4kg block is lowered down a 37 degree incline a distance of 5m from point A to point B. A horizontal force (F=10N) is applied to the block between A and B. the kinetic energy of the block at A is 10J and at B is 20J. How much work is done on the block by the force of friction between A and B?

(3)A rock attached to a string swings in a vertical circle. Which free body diagram could correctly describe the force(s) on the rock when the string is in one possible horizontal position?

**DIAGRAMS ARE ATTACHED** for all of the above questions.
 

Attachments

  • demo1.JPG
    demo1.JPG
    3.3 KB · Views: 318
  • demo3.JPG
    demo3.JPG
    14.9 KB · Views: 313
  • demo2.JPG
    demo2.JPG
    6.2 KB · Views: 383

Answers and Replies

  • #2
Tom Mattson
Staff Emeritus
Science Advisor
Gold Member
5,549
8
You have to show your work to receive help. That is one of the rules you agreed to.
 

Related Threads on Vertical Circles/Work-related Physics

  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
0
Views
1K
Replies
1
Views
572
Replies
5
Views
3K
Replies
9
Views
12K
  • Last Post
Replies
10
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
2K
Top