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 101 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?

Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

Did you know?

In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Did you know?

About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

Did you know?

When intravenous medications are involved in adverse drug events, their harmful effects may occur more rapidly, and be more severe than errors with oral medications. This is due to the direct administration into the bloodstream.

Did you know?

During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.

Effects of growth rate on development. Effects of growth rate on development.
Changes in metabolic rate of selected structures in a mammal's body during different activities Changes in metabolic rate of selected structures in a mammal's body during different activities
Variation in the rate of evolution as a function of the strength of selection, assuming genetic drif Variation in the rate of evolution as a function of the strength of selection, assuming genetic drif
Work and Gender: Women at Work in India Work and Gender: Women at Work in India
home work question home work question
Video: Role of transport in a cell

For a complete list of videos, visit our video library