• Support PF! Buy your school textbooks, materials and every day products Here!

Mastering Physics

  • Thread starter eagles42
  • Start date
  • #1
4
0

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
4
0
A factory worker pushes a 29.3 crate a distance of 5.00 along a level floor at constant velocity by pushing downward at an angle of 31.4 below the horizontal. The coefficient of kinetic friction between the crate and floor is 0.250 .

A) What magnitude of force must the worker apply to move the crate at constant velocity?
Take the free fall acceleration to be .

B) How much work is done on the crate by this force when the crate is pushed a distance of 5.00 ?
Take the free fall acceleration to be .

c) How much work is done on the crate by friction during this displacement?
Take the free fall acceleration to be .

D) How much work is done by the normal force?

E) How much work is done by gravity?

F) What is the total work done on the crate?
 
  • #3
5,428
291
No-one will help you if you have not made an attempt to do the problem yourself.
 
  • #4
4
0
i have no idea where to even start?
 
  • #5
115
0
Just try to grasp the relevant theory. How do we define work? What is friction? What is the equation for friction? etc. Then try to make an attempt to solve it, it's not so difficult.
 
Last edited:
  • #6
4
0
i tried doing 29.3*9.8*.25, anddd then i got 71.785

andd then i did 71.785cos(31.4) and it was wrong and for d n e i got o, i cannot ddddddddddddddddddo the rest
 
  • #7
cristo
Staff Emeritus
Science Advisor
8,107
73
i tried doing 29.3*9.8*.25, anddd then i got 71.785

andd then i did 71.785cos(31.4) and it was wrong and for d n e i got o, i cannot ddddddddddddddddddo the rest
What part of the question are you attempting? And where did the numbers come from? Please show your working properly (and that means algebraic equations, not just numbers); otherwise, it's very hard to help you!
 
  • #8
5,428
291
Try drawing a diagram.
 

Related Threads on Mastering Physics

  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
8K
  • Last Post
Replies
1
Views
6K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
2
Views
4K
  • Last Post
Replies
4
Views
9K
  • Last Post
Replies
3
Views
11K
  • Last Post
Replies
8
Views
6K
Replies
2
Views
14K
Top