« previous next »

Author Question: The Drake equation allows us to estimate the number of A) intelligent civilizations that have ... (Read 49 times)

sdfghj

  • Hero Member
  • *****
  • Posts: 552
on: Jul 27, 2018
The Drake equation allows us to estimate the number of
 
  A) intelligent civilizations that have existed in our galaxy during its entire lifetime
  B) habitable planets on which life has arisen
  C) intelligent civilizations capable of traveling to the Earth
  D) intelligent civilizations capable of communicating in our galaxy now

Question 2

A mine railroad car, of mass 200 kg, rolls with negligible friction on a horizontal track with a speed of 10.0 m/s. A 70. kg stunt man drops straight down a distance of 4.0 m, and lands in the car.
 
  How fast will the car be moving after this happens?


nixon_s

  • Sr. Member
  • ****
  • Posts: 359
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

7.41 m/s


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

Did you know?

Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

Did you know?

Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

Did you know?

Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Did you know?

Hip fractures are the most serious consequences of osteoporosis. The incidence of hip fractures increases with each decade among patients in their 60s to patients in their 90s for both women and men of all populations. Men and women older than 80 years of age show the highest incidence of hip fractures.

How to find the equation of a line passing through two points How to find the equation of a line passing through two points
Uncompetitive inhibitor equation Uncompetitive inhibitor equation
The Location and Number of Farms in the United States, 2012 The Location and Number of Farms in the United States, 2012
The Location and Number of Food- and Beverage-Processing Facilities The Location and Number of Food- and Beverage-Processing Facilities
Equation Equation
The minimum number of moles of oxygen needed to completely consume 4 moles of C3H8O is ... The minimum number of moles of oxygen needed to completely consume 4 moles of C3H8O is ...
Video: Epinephrine/NE (heart rate, altered blood flow, glycogenolysis & bronchodilation)

For a complete list of videos, visit our video library