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

Author Question: A 50. cm diameter wheel is rotating initially at 2.0 revolutions per second. It slows down uniformly ... (Read 99 times)

cdr_15

  • Hero Member
  • *****
  • Posts: 546
on: Jul 27, 2018
A 50. cm diameter wheel is rotating initially at 2.0 revolutions per second. It slows down uniformly and comes to rest in 15 seconds.
 
  (a) What was its angular acceleration?
  (b) Through how many revolutions did it turn in those 15 s?

Question 2

The near point of a farsighted person is 100 cm. She places reading glasses close to her eye, and with them she can comfortably read a newspaper at a distance of 25 cm. What lens power is required?
 
  A) +2.5 D
  B) +3.0 D
  C) -2.0 D
  D) +3.2 D
  E) -2.5 D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Fayaz00962

  • Sr. Member
  • ****
  • Posts: 330
Reply #1 on: Jul 27, 2018
Answer to Question 1

(a) -0.13 rev/s2 = -0.84 rad/s2
(b) 15. rev

Answer to Question 2

B


cdr_15

  • Hero Member
  • *****
  • Posts: 546
Reply #2 on: Jul 27, 2018
Thank you!


Fayaz00962

  • Sr. Member
  • ****
  • Posts: 330
Reply #3 on: Jul 27, 2018
Always glad to help...


« previous next »
 

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Did you know?

Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

Did you know?

Cutaneous mucormycosis is a rare fungal infection that has been fatal in at least 29% of cases, and in as many as 83% of cases, depending on the patient's health prior to infection. It has occurred often after natural disasters such as tornados, and early treatment is essential.

Did you know?

For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

Rotating around any node leaves a phylogeny unchanged Rotating around any node leaves a phylogeny unchanged
Maxwell wheel Maxwell wheel
Rotating Furnace for Making Parabolic Telescope Mirrors Rotating Furnace for Making Parabolic Telescope Mirrors
A Rotating, Magnetized Neutron Star A Rotating, Magnetized Neutron Star
Growth Chart for American Girls From Birth Through Age 3 Growth slows from infancy to toddlerhood b Growth Chart for American Girls From Birth Through Age 3 Growth slows from infancy to toddlerhood b
A racing car accelerates uniformly from rest along a straight track. This track has markers ... A racing car accelerates uniformly from rest along a straight track. This track has markers ...
Video: Interspecific Competition Relationship - Competitive & Niche Differentiation

For a complete list of videos, visit our video library