« previous next »

Author Question: In space there is nothing for the rocket to push against so how does it accelerate? What will be ... (Read 24 times)

DelorasTo

  • Hero Member
  • *****
  • Posts: 548
on: Jul 29, 2018
In space there is nothing for the rocket to push against so how does it accelerate?
 
  What will be an ideal response?

Question 2

A ball is thrown straight up with a speed of 30 m/s. (a.) How long does it take the ball to reach the maximum height? (b.) What is the maximum height reached by the ball? (c.) What is its speed after 4.2 s?
 
  What will be an ideal response?


chevyboi1976

  • Sr. Member
  • ****
  • Posts: 344
Reply #1 on: Jul 29, 2018
Answer to Question 1

In terms of forces, the rocket pushes the exhaust gases back and they in turn (action-reaction) push the rocket forward. In terms of momentum, in order to conserve momentum since the exhaust gases acquire negative momentum (moving backwards) the rocket acquires positive momentum (increasing velocity forward).

Answer to Question 2

(a.) 3.1 s
(b.) 46 m
(c.) 11 m/s


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

Did you know?

Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Did you know?

Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.

Aurora australis observed from the Space Shuttle Discovery, on STS-39, May 1991 (orbital altitude: 2 Aurora australis observed from the Space Shuttle Discovery, on STS-39, May 1991 (orbital altitude: 2
True-color view of Mars seen through NASA's Hubble Space Telescope in 1999 True-color view of Mars seen through NASA's Hubble Space Telescope in 1999
Injecting an IV push (bolus) medication; B, into a primary infusion line Injecting an IV push (bolus) medication; B, into a primary infusion line
Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican Charles Darwin may be dead and gone but a recent write-in campaign has pitted him against Republican
The reflection nebula NGC 1999 is brilliantly illuminated by V380 Orionis (center), a variable star The reflection nebula NGC 1999 is brilliantly illuminated by V380 Orionis (center), a variable star
Create space between metatarsals by pulling sides of foot away from each other. Create space between metatarsals by pulling sides of foot away from each other.
Video: Negative Feedback Regulation of Blood Pressure

For a complete list of videos, visit our video library