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 194 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
Excellent

irishcancer18

  • Member
  • Posts: 310
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Anti-aging claims should not ever be believed. There is no supplement, medication, or any other substance that has been proven to slow or stop the aging process.

Did you know?

Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

Did you know?

Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

How phytochrome acts as a molecular light switch. How phytochrome acts as a molecular light switch.
The Speed of Light Is Constant The Speed of Light Is Constant
Surface Offset on San Andreas Fault Surface Offset on San Andreas Fault
Apply light stroking with the palms from hip to ankles as a connecting and finishing technique. ... Apply light stroking with the palms from hip to ankles as a connecting and finishing technique. ...
How to find the constant (C) after finding the anti-derivative How to find the constant (C) after finding the anti-derivative
A forklift pushes a 100-kg crate, starting from rest, exerting a horizontal force of magnitude ... A forklift pushes a 100-kg crate, starting from rest, exerting a horizontal force of magnitude ...
Video: Bone elongation - processes at the epiphyseal plate

For a complete list of videos, visit our video library