This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A 25-kg block on a horizontal surface is attached to a light spring (force constant = 8.0 kN/m). The ... (Read 164 times)

yoooooman

  • Hero Member
  • *****
  • Posts: 557
on: Jul 28, 2018
A 25-kg block on a horizontal surface is attached to a light spring (force constant = 8.0 kN/m). The block is pulled 10 cm to the right from its equilibrium position and released from rest. When the block has moved 2.0 cm toward its equilibrium position, its kinetic energy is 12 J. What is the change in mechanical energy caused by the frictional force on the block as it moves the 2.0 cm?
 a. -4.0 J
  b. -3.5 J
  c. -2.4 J
  d. -2.9 J
  e. -15 J

Question 2

A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?
 a. -0.21 kJ
  b. -0.47 kJ
  c. -0.40 kJ
  d. -0.34 kJ
  e. -0.69 kJ


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

akpaschal

  • Sr. Member
  • ****
  • Posts: 342
Reply #1 on: Jul 28, 2018
Answer to Question 1

C

Answer to Question 2

A


yoooooman

  • Member
  • Posts: 557
Reply 2 on: Jul 28, 2018
Wow, this really help

kishoreddi

  • Member
  • Posts: 329
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

Did you know?

Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

Did you know?

Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

Did you know?

Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Went and Briggs demonstrated the relationship between light perception and auxin function. Went and Briggs demonstrated the relationship between light perception and auxin function.
The proportion of adults 55 to 64 in the labor force in Germany, Italy, and France is low and has ... The proportion of adults 55 to 64 in the labor force in Germany, Italy, and France is low and has ...
This battery-powered tester uses light-emitting diodes (LEDs), meter lead terminals, and two small ... This battery-powered tester uses light-emitting diodes (LEDs), meter lead terminals, and two small ...
Interactions of Light and Matter Interactions of Light and Matter
Spinal changes caused by osteoporosis. Use light pressure and gentle stretches only with frail or ... Spinal changes caused by osteoporosis. Use light pressure and gentle stretches only with frail or ...
A container in the shape of a right circular cylinder with no top has surface area square feet. A container in the shape of a right circular cylinder with no top has surface area square feet.
Video: New DNA Strand Replication

For a complete list of videos, visit our video library