« previous next »

Author Question: The mass ratio of a rocket is defined to be the A) mass of the empty rocket without fuel divided ... (Read 48 times)

Mr. Wonderful

  • Hero Member
  • *****
  • Posts: 866
on: Jul 27, 2018
The mass ratio of a rocket is defined to be the
 
  A) mass of the empty rocket without fuel divided by the mass of the payload
  B) mass of the fully fueled rocket divided by the mass of the rocket after the fuel is burned
  C) mass of the rocket after the fuel is burned divided by the mass of the fully fueled rocket
  D) mass of the fuel in the rocket divided by the mass of the rocket payload

Question 2

The excited state of a certain atom is 3.2 eV  0.21 eV.
 
  (a) What is the average lifetime of this state?
  (b) If the excited energy doubled (6.4 eV  0.21 eV) how would the lifetime be affected?


nathang24

  • Sr. Member
  • ****
  • Posts: 314
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

(a) 1.6 fs
(b) unchanged, uncertainty still  0.21 eV


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.

Did you know?

The average person is easily confused by the terms pharmaceutics and pharmacology, thinking they are one and the same. Whereas pharmaceutics is the science of preparing and dispensing drugs (otherwise known as the science of pharmacy), pharmacology is the study of medications.

Did you know?

The Centers for Disease Control and Prevention has released reports detailing the deaths of infants (younger than 1 year of age) who died after being given cold and cough medications. This underscores the importance of educating parents that children younger than 2 years of age should never be given over-the-counter cold and cough medications without consulting their physicians.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

The Mass of Impacts on Earth The Mass of Impacts on Earth
Oceanic Crust Has a Well-defined Internal Structure Oceanic Crust Has a Well-defined Internal Structure
Half Full or Half Empty Half Full or Half Empty
Inline fuel filters are usually attached to the fuel line with screw clamps or threaded ... Inline fuel filters are usually attached to the fuel line with screw clamps or threaded ...
A typical port fuel-injection system squirts fuel into the low pressure (vacuum) of the intake ... A typical port fuel-injection system squirts fuel into the low pressure (vacuum) of the intake ...
The X/A ratio determines gene transcription and transcript splicing pattern The X/A ratio determines gene transcription and transcript splicing pattern
Video: Asthma Treatment

For a complete list of videos, visit our video library