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 133 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

yeungji

  • Member
  • Posts: 319
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

Did you know?

Critical care patients are twice as likely to receive the wrong medication. Of these errors, 20% are life-threatening, and 42% require additional life-sustaining treatments.

Did you know?

Blood is approximately twice as thick as water because of the cells and other components found in it.

Did you know?

According to animal studies, the typical American diet is damaging to the liver and may result in allergies, low energy, digestive problems, and a lack of ability to detoxify harmful substances.

Did you know?

The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

Micrographs of nerve cells taken with different types of light microscopes. Micrographs of nerve cells taken with different types of light microscopes.
Surface magnetic field of SU Aur (a young star of T Tauri type), reconstructed by means of Zeeman-Do Surface magnetic field of SU Aur (a young star of T Tauri type), reconstructed by means of Zeeman-Do
Stretch shoulder in horizontal flexion by grasping at the forearm and reaching the entire arm across ... Stretch shoulder in horizontal flexion by grasping at the forearm and reaching the entire arm across ...
Landscape "Spring Fresco" Landscape "Spring Fresco"
C heck the description bcuz the question is too long. there is a file attached but it is the ... C heck the description bcuz the question is too long. there is a file attached but it is the ...
The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum The surface temperature of the star is 6000 K. At what wavelength is its light output a maximum
Video: Oxygen transport - methods and oxyhemoglobin

For a complete list of videos, visit our video library