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 220 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?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Did you know?

Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.

Did you know?

Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

Did you know?

The effects of organophosphate poisoning are referred to by using the abbreviations “SLUD” or “SLUDGE,” It stands for: salivation, lacrimation, urination, defecation, GI upset, and emesis.

Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

Malpighian tubules from the excretory system of an insect. Malpighian tubules from the excretory system of an insect.
Spectral Line Motion in Binary Star Systems Spectral Line Motion in Binary Star Systems
During the Pullman strike in Chicago, workers protesting wage cuts did $340,000 in property damage, During the Pullman strike in Chicago, workers protesting wage cuts did $340,000 in property damage,
Disorders of the Male Reproductive System Disorders of the Male Reproductive System
Smallest Part of Social Networks: Friends Smallest Part of Social Networks: Friends
The Central Nervous System Includes the Brain and Spinal Cord The Central Nervous System Includes the Brain and Spinal Cord
Video: Passive Smoke Exposure

For a complete list of videos, visit our video library