On the average, a blink lasts about 100ms

  • Thread starter ajbryant
  • Start date
  • #1
ajbryant
on the average, a blink lasts about 100ms. how far does a MiG-25 foxbat fighter travels during a pilot blink if the plane average velocity is 2500mi/h. my answer is 69.4

what is the acceleration of a car that moves at a steady velocity of 115 km/h for 115 seconds? my answer is 115km/h. the explanation of this answer is b/c the steady velocity of the acceleration of the car is going in the same of 115km/h as it is in 115 sec.

a car takes 14s to go from v=0 to v=30m/s at approximately constant acceleration. if you wish to find the distance traveled using the equation d = 1/2at^2, what value should you use for a?
 
Last edited by a moderator:

Answers and Replies

  • #2
2500 mph / 3600 (seconds per hour) = .6944444
one tenth of that is about 1/16 of a mile in a tenth of a second.


Steady velocity means no acceleration, (it would have to be traveling straight technically speaking)


a= (v2-v1)/(t2-t1)

or, the change in velocity over the change in time
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
41,833
956
"my answer is 69.4"
69.4 WHAT? Your answer doesn't make sense without units: miles?, feet?, meters? and thinking about how the units match up might help you see how to get the answer.

"what is the acceleration of a car that moves at a steady velocity of 115 km/h for 115 seconds?"
Are you sure you have copied the question correctly? At a minimum you should know that "acceleration" MEANS the rate at which velocity is CHANGING. If the car "moves at a steady velocity" then the acceleration is 0.

"my answer is 115km/h. the explanation of this answer is b/c the steady velocity of the acceleration of the car is going in the same of 115km/h as it is in 115 sec."
Once again, check your units. Acceleration is km/h2, not km/h. Understanding that may help. By the way, "the steady velocity of the acceleration" makes no sense at all!

"a car takes 14s to go from v=0 to v=30m/s at approximately constant acceleration. if you wish to find the distance traveled using the equation d = 1/2at^2, what value should you use for a?"
WHY should you use that formula. It is NEVER a good idea to use a formula that you don't understand. When you learned the formula you should have learned what "d", "a", and "t" MEANT. Knowing that, the answer is easy.
 

Related Threads on On the average, a blink lasts about 100ms

  • Last Post
Replies
1
Views
1K
Replies
3
Views
2K
  • Last Post
Replies
3
Views
6K
Replies
4
Views
2K
  • Last Post
Replies
9
Views
3K
  • Last Post
Replies
2
Views
1K
Replies
1
Views
514
  • Last Post
Replies
3
Views
4K
Replies
39
Views
7K
Replies
0
Views
2K
Top