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

Author Question: At what rate is the gravitational force on a 2.0-kg projectile doing work at an instant when the ... (Read 95 times)

cmoore54

  • Hero Member
  • *****
  • Posts: 568
on: Jul 28, 2018
At what rate is the gravitational force on a 2.0-kg projectile doing work at an instant when the velocity of the projectile is 4.0 m/s directed 30 above the horizontal?
 a. +39 W
  b. -78 W
  c. -39 W
  d. +78 W
  e. +25 W

Question 2

A 6.0-kg block slides along a horizontal surface. If k = 0.20 for the block and surface, at what rate is the friction force changing the mechanical energy of the block at an instant when its speed is 4.0 m/s?
 a. -59 W
  b. -47 W
  c. -71 W
  d. -82 W
  e. +71 W


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

dyrone

  • Sr. Member
  • ****
  • Posts: 322
Reply #1 on: Jul 28, 2018
Answer to Question 1

C

Answer to Question 2

B


cmoore54

  • Hero Member
  • *****
  • Posts: 568
Reply #2 on: Jul 28, 2018
TY


dyrone

  • Sr. Member
  • ****
  • Posts: 322
Reply #3 on: Jul 28, 2018
You're welcome


« previous next »
 

Did you know?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Did you know?

Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

Did you know?

Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.

Did you know?

The Centers for Disease Control and Prevention has released reports detailing the deaths of infants (younger than 1 year of age) who died after being given cold and cough medications. This underscores the importance of educating parents that children younger than 2 years of age should never be given over-the-counter cold and cough medications without consulting their physicians.

Did you know?

Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

Traction is the application of a pulling force to maintain bone alignment during fracture healing. D Traction is the application of a pulling force to maintain bone alignment during fracture healing. D
The immune system has several different components that work in concert. The immune system has several different components that work in concert.
A poster encourages women to work in munitions to support the war effort. A poster encourages women to work in munitions to support the war effort.
Effect of Increasing the Investment Rate on the Steady State Effect of Increasing the Investment Rate on the Steady State
Turning Play into Work Turning Play into Work
How far apart should two protons be if the electrical force of repulsion exerted on each one is ... How far apart should two protons be if the electrical force of repulsion exerted on each one is ...
Video: Depolarization of the SA node, Action potentials of the myocardium & ANS effects

For a complete list of videos, visit our video library