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

Author Question: A 30-year-old astronaut goes off on a long term mission in a spacecraft that travels at speeds close ... (Read 41 times)

V@ndy87

  • Hero Member
  • *****
  • Posts: 571
on: Jul 29, 2018
A 30-year-old astronaut goes off on a long term mission in a spacecraft that travels at speeds close to that of light. The mission lasts exactly 20 years as measured on Earth. Biologically speaking, the astronaut's age would be
 
  A) more than 50 years.
  B) exactly 50 years.
  C) less than 50 years.
  D) exactly 30 years.
  E) exactly 25 years.

Question 2

One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900C; exhaust temperature = 430C. 7.0  109 cal of fuel produces 1.4  1010 J of work in one hour.
 
  What is the power output, in hp, of this engine?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

jaaaaaaa

  • Sr. Member
  • ****
  • Posts: 341
Reply #1 on: Jul 29, 2018
Answer to Question 1

C

Answer to Question 2

5213 hp


V@ndy87

  • Member
  • Posts: 571
Reply 2 on: Jul 29, 2018
:D TYSM

parshano

  • Member
  • Posts: 333
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

Did you know?

Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

Did you know?

Automated pill dispensing systems have alarms to alert patients when the correct dosing time has arrived. Most systems work with many varieties of medications, so patients who are taking a variety of drugs can still be in control of their dose regimen.

Did you know?

The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

Did you know?

Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the
Eighteen-year-olds were the largest age cohort in the first year of the war in both armies. Soldiers Eighteen-year-olds were the largest age cohort in the first year of the war in both armies. Soldiers
Apply the substance to the arm with long, smooth strokes, then cover the arm and abdomen with the ... Apply the substance to the arm with long, smooth strokes, then cover the arm and abdomen with the ...
Foods for Baby’s First Year Foods for Baby’s First Year
Spacecraft optimum geometrical shape Spacecraft optimum geometrical shape
Video: Introduction to Breast Cancer

For a complete list of videos, visit our video library