Author Question: A 3.00-m long plank of negligible mass has a 30.0-kg mass at one end and a 40.0-kg mass at the other ... (Read 236 times)

cagreen833

  • Hero Member
  • *****
  • Posts: 544
A 3.00-m long plank of negligible mass has a 30.0-kg mass at one end and a 40.0-kg mass at the other end. How far from the 30.0-kg mass should a fulcrum be placed so that the plank is balanced?
 
  A)
 
  1.71 m
 
  B)
 
  1.29 m
 
  C)
 
  0.750 m
 
  D)
 
  1.50 m
 
  E)
 
  2.25 m

Question 2

State the principle of conservation of mechanical energy
 
  What will be an ideal response?



lkoler

  • Sr. Member
  • ****
  • Posts: 358
Answer to Question 1

A

Answer to Question 2

If only conservative forces are doing work, the total mechanical energy of a system neither increases nor decreases in any process. It stays constant - it is conserved.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

By definition, when a medication is administered intravenously, its bioavailability is 100%.

Did you know?

Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

Did you know?

Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

Did you know?

Though newer “smart” infusion pumps are increasingly becoming more sophisticated, they cannot prevent all programming and administration errors. Health care professionals that use smart infusion pumps must still practice the rights of medication administration and have other professionals double-check all high-risk infusions.

Did you know?

People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.

For a complete list of videos, visit our video library