This topic contains a solution. Click here to go to the answer

Author Question: A 3.0-kg mass is dropped from the edge of a 50-m tall building with an initial speed of zero. The ... (Read 126 times)

ghost!

  • Hero Member
  • *****
  • Posts: 560
A 3.0-kg mass is dropped from the edge of a 50-m tall building with an initial speed of zero. The mass strikes the ground with a downward velocity of 25 m/s. Find the change in mechanical energy of the mass caused by air resistance between the point where it is dropped and the point where it strikes the ground?
 a. -0.46 kJ
  b. -0.53 kJ
  c. -0.61 kJ
  d. -0.38 kJ
  e. -0.81 kJ

Question 2

A particle is acted upon by only two forces, one conservative and one nonconservative and neither being a force of friction, as it moves from point A to point B. The kinetic energies of the particle at points A and B are equal if
 a. the sum of the works of the two forces is zero.
  b. the work of the conservative force is equal to the work of the nonconservative force. c. the work of the conservative force is zero.
  d. the work of the nonconservative force is zero.
  e. None of the above.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

quynhmickitran

  • Sr. Member
  • ****
  • Posts: 330
Answer to Question 1

B

Answer to Question 2

A




ghost!

  • Member
  • Posts: 560
Reply 2 on: Jul 28, 2018
Gracias!


Zebsrer

  • Member
  • Posts: 284
Reply 3 on: Yesterday
Excellent

 

Did you know?

Chronic necrotizing aspergillosis has a slowly progressive process that, unlike invasive aspergillosis, does not spread to other organ systems or the blood vessels. It most often affects middle-aged and elderly individuals, spreading to surrounding tissue in the lungs. The disease often does not respond to conventionally successful treatments, and requires individualized therapies in order to keep it from becoming life-threatening.

Did you know?

The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

The horizontal fraction bar was introduced by the Arabs.

Did you know?

There are 60,000 miles of blood vessels in every adult human.

For a complete list of videos, visit our video library