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

Author Question: Bert and Ernie are two friends of the same age. Bert visits a nearby star system on a spaceship that ... (Read 221 times)

V@ndy87

  • Hero Member
  • *****
  • Posts: 571
on: Jul 27, 2018
Bert and Ernie are two friends of the same age. Bert visits a nearby star system on a spaceship that travels close to the speed of light while Ernie stays at home. Which of the following will be true on Bert's return to Earth?
 
  A) Ernie will be younger than Bert
  B) Ernie will be older than Bert
  C) Bert and Ernie will still be the same age
  D) Ernie will not have been born

Question 2

A ball with diameter 10. cm rolls without slipping on a horizontal table top. The moment of inertia of the ball is 2.2  10-3 kg-m2 and its translational speed is 0.45 m/s.
 
  (a) What is its angular speed about its center of mass?
  (b) What is its rotational kinetic energy?
  (c) What is its angular momentum?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

brbarasa

  • Sr. Member
  • ****
  • Posts: 308
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

(a) 9.0 rad/s
(b) 0.089 J
(c) 0.020 J  s


V@ndy87

  • Hero Member
  • *****
  • Posts: 571
Reply #2 on: Jul 27, 2018
TY


brbarasa

  • Sr. Member
  • ****
  • Posts: 308
Reply #3 on: Jul 27, 2018
You're welcome


« previous next »
 

Did you know?

Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.

Did you know?

The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

Did you know?

Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.

Did you know?

Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

Acetylcholine receptors and the autonomic nervous system Acetylcholine receptors and the autonomic nervous system
Yellow Star Grass Yellow Star Grass
The Major Divisions of the Nervous System The Major Divisions of the Nervous System
The urinary system: Relationship of the kidneys to the vertebrae The urinary system: Relationship of the kidneys to the vertebrae
The digestive system The digestive system
Male Reproductive System - System of ducts الجهاز التناسلي الذكري Male Reproductive System - System of ducts الجهاز التناسلي الذكري
Video: Eczema

For a complete list of videos, visit our video library