0
Casch

Physics Test at 1:00

Recommended Posts

Ok, I have a pretty simple physics test on trajectory motion. I am almost 100% confident that I will ace the test but I was hoping maybe someone could give me a problem to solve. I think the problems will be something like this:

Billy shoots a rock from his sling shot at 72m/s at a 43 degree angle. What is the time of flight, what is the max height that the rock will reach and how far horizontally will it fly?

--------------------------------------------------------
Edited to add: Time of Flight: 10 s
Max Height: 123 m
Horizontal Distance: 526.6 M

Am I right????
--------------------------------------------------------

drag and such will not be factored into the problem...I haven't learned how to do that yet. Come on guys! Gimme a hard Q!

Share this post


Link to post
Share on other sites
Taking into consider the coriolus force, but no drag. At a lattitude of 42 degrees north. A bullet is fired at 1000 feet per second. If it were to continue at that speed, How far would the bullet deviate north as it traveled to Chicago.
Given: Assume boston and Chicago are both at 42 degrees north.
Distance between them is 900 miles.

Share this post


Link to post
Share on other sites
I let you in on a little secret. You never do learn how to factor in air resistance. Unless, perhaps you get into a specific discipline that deals with aerodynamics.

So, I get to keep living in my perfect Newtonian world.


Respect the Dolphin

Share this post


Link to post
Share on other sites
Billy shoots a rock from his sling shot at 72m/s at a 43 degree angle. What is the time of flight, what is the max height that the rock will reach and how far horizontally will it fly?
Billy is standing on top of a tree, 15 feet off the ground when he shoots the slingshot. The rock is actually a large round marble.
After you figure out where the marble lands, place a 15 degree hill where it lands, with 10 feet left of rolling-down room, followed by flat land. How fast is it going when it's done rolling down the hill, and how far does it go onto the flat (again not taking friction etc. into account).
My high school physics professor was sick...
Wendy W.
There is nothing more dangerous than breaking a basic safety rule and getting away with it. It removes fear of the consequences and builds false confidence. (tbrown)

Share this post


Link to post
Share on other sites
Quote

How fast is it going when it's done rolling down the hill, and how far does it go onto the flat (again not taking friction etc. into account).



Velocity = 6 m/s
Travel = 98 m

Is that close ?? B|

Butthead: Whoa! Burritos for breakfast!
Beavis: Yeah! Yeah! Cool!
bellyflier on the dz.com hybrid record jump

Share this post


Link to post
Share on other sites
One I used to like was the classic "shoot the monkey" problem...

Problem: A hunter fires a dart gun with a harmless sedative at a monkey hanging from a vine a distance h vertically above the dart gun and a distance R horizontally away from the dart gun. The hunter aims directly at the monkey and fires, but just as the hunter fires, the monkey, using its incredible spider-monkey sense, realizes what's up and drops from the vine. Does the monkey avoid the dart?

Enjoy.
~Chivo

Share this post


Link to post
Share on other sites
Quote

In that case, it would keep rolling forever.


You're absolutely right. Surprising the things you forget about in 30 years... I don't remember any more what we were supposed to ignore, but yes, we did have problems like this. He'd walk us through them over the period of a couple of days.
That's what you get for having a hs physics prof who's doing it as a sideline to his university physics professor job...
Wendy W.
There is nothing more dangerous than breaking a basic safety rule and getting away with it. It removes fear of the consequences and builds false confidence. (tbrown)

Share this post


Link to post
Share on other sites
Quote

I let you in on a little secret. You never do learn how to factor in air resistance. Unless, perhaps you get into a specific discipline that deals with aerodynamics.

So, I get to keep living in my perfect Newtonian world.



Hehe, yeah, I'm in aerospace engineering. Today I had a class on aileron reversal at high speed due to wing twist. In another class we've been studying supersonic engine inlets, and in a 3rd today we started learning how to calculate the total parasite drag on a plane. And yet, I never did have to go back and solve for the trajectory of the rock when you account for air resistance. I did have to model a pendulum swinging with air resistance once though and create an animation of it.

I MISS NEWTON!

Dave

Share this post


Link to post
Share on other sites
Quote

two trains leave the station at the same time travelling in opposite directions.................

heheh boy i loved problems like that.. (NOT!)



if billy is on one and his wife is on the other.
who is going to get blamed for her getitng on the worng train?
physics is SOOO easy
My photos

My Videos

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

0