Help With Physics

Off Topic
21

[quote]golferguy12 wrote:
Alright, thanks for the responses. The thing about this class is that it’s completely graded off of homework, which is turned in online. You get three guesses per question, and at the end all of your homework is added up and that is your grade. This may seem easy, but there is homework every night and I spend 4-5 hours per night on it and still get less than 50% right. The entire class is averaging around that.

The teacher said its supposed to be hard, thats why we get three guess per question, and even the tutors I went to could not figure it out. I would go in early, but I work from 6-11 am (class 12-2 M-Thurs.) and then I use the rest of my day to actually do the homework or practice golf (collegiate golfer). I was just hoping somebody could help me get some points and maybe change my mind about dropping, but I guess not. Understandable, thanks for the tries.[/quote]

These questions are not hard. If you had attempted them, posted your answers, and asked specific questions, I would have been more than willing to help you. I like physics. I just hope the people that did give you the answers didn’t get them right, I didn’t take the time to solve them.

I wouldn’t worry about dropping the class. Just drop out of school instead. It is nimwits like you that are bringing down the entire system and the quality of education for others.

Isn’t the semester over anyways?

22

[quote]tedro wrote:
golferguy12 wrote:
Alright, thanks for the responses. The thing about this class is that it’s completely graded off of homework, which is turned in online. You get three guesses per question, and at the end all of your homework is added up and that is your grade. This may seem easy, but there is homework every night and I spend 4-5 hours per night on it and still get less than 50% right. The entire class is averaging around that.

The teacher said its supposed to be hard, thats why we get three guess per question, and even the tutors I went to could not figure it out. I would go in early, but I work from 6-11 am (class 12-2 M-Thurs.) and then I use the rest of my day to actually do the homework or practice golf (collegiate golfer). I was just hoping somebody could help me get some points and maybe change my mind about dropping, but I guess not. Understandable, thanks for the tries.

These questions are not hard. If you had attempted them, posted your answers, and asked specific questions, I would have been more than willing to help you. I like physics. I just hope the people that did give you the answers didn’t get them right, I didn’t take the time to solve them.

I wouldn’t worry about dropping the class. Just drop out of school instead. It is nimwits like you that are bringing down the entire system and the quality of education for others.

Isn’t the semester over anyways?[/quote]

I actually attempted them for 3 hours. I have a 3.8 GPA, biochemistry major, cell and molecular biology minor. I have never taken physics before, and we have covered 7 chapters in 7 classes. Its a 6 week summer class. I have put a considerable amount of time in, but I just have trouble seeing how to solve the problems. I dont understand how me not understanding material brings down the entire system and the quality of education for others. like I said, the average in the class is below a 50%. Obviously the teacher is doing something wrong.

If your gonna be a dick about things, make sure your actually talking to someone who is a nimwit. Im sorry im an idiot because I don’t find the problems easy. I also appreciate you trying to make me look bad by displaying random outbursts for everybody who looks at this thread, but your attention seeking remarks have actually made me feel better about myself because I realize how nice it is to not be an asshole, especially to someone who is sincere about getting help.

23

[quote]HoratioSandoval wrote:
golferguy12 wrote:
Alright, thanks for the responses. The thing about this class is that it’s completely graded off of homework, which is turned in online. You get three guesses per question, and at the end all of your homework is added up and that is your grade. This may seem easy, but there is homework every night and I spend 4-5 hours per night on it and still get less than 50% right. The entire class is averaging around that.

The teacher said its supposed to be hard, thats why we get three guess per question, and even the tutors I went to could not figure it out. I would go in early, but I work from 6-11 am (class 12-2 M-Thurs.) and then I use the rest of my day to actually do the homework or practice golf (collegiate golfer). I was just hoping somebody could help me get some points and maybe change my mind about dropping, but I guess not. Understandable, thanks for the tries.

C’mon, what kind of retarded tutors do you have? This is all easy stuff.

It’s got to be your first or second week of class - are you already going to go down in a ball of flames?

If your major requires physics, it’s going to get wayyyyy harder than this. One class is not enough. I assume you’ve had calc so you’re not taking this to get a science w/a lab. What’s your major? Dropping the class will not help unless you radically change your major. Are you ready for that?[/quote]

Its a 6 week summer class (4 days a week) that covers 20 chapters. For never having physics before, I think its just going a little fast. I just have trouble seeing which equations to use. I understand that requires time to make it easy, but once we have those HW problems, we are never quizzed over them again. I don’t have time to learn them because the next night we have homework over the next chapter or two.Im taking physics for the MCAT, but I think I will just take it at the school I attend for Fall and Spring semesters. I’m a biochem major, by the way.

24

[quote]dasboi wrote:
golferguy12 wrote:

  1. In Denver, children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target on the ground. Suppose that the tower height is h = 7.80 m, and that the bulls-eye’s horizontal distance is d = 3.9 m from the launch point. If the pumpkin is thrown horizontally, what is the launch speed needed to hit the bulls-eye? (Neglect air resistance.)

time taken to drop 7.8m = 7.8/9.81 = 0.795s
therefore, launch speed = 3.9/0.795 = 4.91m/s[/quote]

This is completely wrong.

Here you are dividing a distance by an acceleration. The answer of .795 is in seconds squared!
Gravity is an acceleration, not a velocity or speed.

Looking at units:

x =7.8 METERS / 9.81 meters per second^2
x = 7.8 METERS / 9.81 meters per second per second
x = meters = meters/second* second
x = (meters /meters)secondsecond
x = second * second = second^2

When you are unsure, ALWAYS do unit check.

Remember that when he drops the ball the initial vertical velocity is 0 since he drops it from rest (the only given initial velocity is horizontal only).

An acceleration of 9.8 meters/second^2 means the velocity increases by 9.81 meters/second every second.

So within half a second the velocity/speed is 4.9 meters/sec…
in one second the velocity/speed is now 9.81 meters/sec…
in 2 seconds the velocity/speed is 19.62 meters/second.

Thread-starter, the answer given by dasboi is incorrect, you’d do well to ignore the other ones (of his) as well.
Good luck.

edit: I used to be in bio (chem) but dropped it cause i didn’t like it(i did understand it though :stuck_out_tongue: ). I prefer physics and maths way more. Just because someone doesn’t “get” something doesn’t make them stupid or anything. To each their own. I’m sure he’s doing stuff in biochem that would boggle our minds. Chemistry is fucking hard. Fucking pi bonds and shit :frowning: With the different “chair” formations for organic. Gay.
At least he is trying for the physics.
If you aren’t good at physics or math, it’s better to take it during a normal semester since the summer courses tend to be much more condensed and consequently, more difficult.
Good luck.

25

[quote]golferguy12 wrote:
I actually attempted them for 3 hours.
[/quote]

Then tell us what you think the answers are, and we can likely find your mistakes and better help you.

Good luck in physical chemistry and your other advanced biochem courses.

Not understanding isn’t what brings the system down. Cheating on homework does. Blaming the teacher for your inadequacies does. This is college, not kindergarten. Take some responsibility. If you need a tutor find one. Ask intelligent questions. Don’t blame others because you don’t understand.

I didn’t call you an idiot. I know smart people that have struggled with physics. The difference is that they never looked for the easy way out.

LOL!

26

[quote]tedro wrote:
golferguy12 wrote:
I actually attempted them for 3 hours.

Then tell us what you think the answers are, and we can likely find your mistakes and better help you.

I have a 3.8 GPA, biochemistry major, cell and molecular biology minor. I have never taken physics before, and we have covered 7 chapters in 7 classes. Its a 6 week summer class. I have put a considerable amount of time in, but I just have trouble seeing how to solve the problems.

Good luck in physical chemistry and your other advanced biochem courses.

I dont understand how me not understanding material brings down the entire system and the quality of education for others. like I said, the average in the class is below a 50%. Obviously the teacher is doing something wrong.

Not understanding isn’t what brings the system down. Cheating on homework does. Blaming the teacher for your inadequacies does. This is college, not kindergarten. Take some responsibility. If you need a tutor find one. Ask intelligent questions. Don’t blame others because you don’t understand.

If your gonna be a dick about things, make sure your actually talking to someone who is a nimwit. Im sorry im an idiot because I don’t find the problems easy.

I didn’t call you an idiot. I know smart people that have struggled with physics. The difference is that they never looked for the easy way out.

I also appreciate you trying to make me look bad by displaying random outbursts for everybody who looks at this thread, but your attention seeking remarks have actually made me feel better about myself because I realize how nice it is to not be an asshole, especially to someone who is sincere about getting help.

LOL!
[/quote]

I like you

27

[quote]golferguy12 wrote:
I have put a considerable amount of time in, but I just have trouble seeing how to solve the problems. [/quote]

Well, based on that, one would question your intellectual abilities. I mean, this is stuff my 15 years old cousin could solve.

By posting those “problems” without showing us what you attempted, you’re showing disrespect for other people’s time. On ANY physics forum, you would have never gotten a single answer without showing that you actually put pen to paper for some time.

Ethics aside, your thread is kinda like the idiots who can’t be bothered to use Google for a couple of minutes before posting - only worse! Don’t try to justify what you did. Suck it up, thank the nice people who lent a hand and promise that you’ll post your trials next time.

28

Dude

This looks like Intro Physics, easy stuff.

All the formulas are in the book, these questions are just about knowing which formulas to use and plugging the variables in.

29

[quote]blazindave wrote:
dasboi wrote:
golferguy12 wrote:

  1. In Denver, children bring their old jack-o-lanterns to the top of a tower and compete for accuracy in hitting a target on the ground. Suppose that the tower height is h = 7.80 m, and that the bulls-eye’s horizontal distance is d = 3.9 m from the launch point. If the pumpkin is thrown horizontally, what is the launch speed needed to hit the bulls-eye? (Neglect air resistance.)

time taken to drop 7.8m = 7.8/9.81 = 0.795s
therefore, launch speed = 3.9/0.795 = 4.91m/s

This is completely wrong.

Here you are dividing a distance by an acceleration. The answer of .795 is in seconds squared!
Gravity is an acceleration, not a velocity or speed.

[/quote]

whoops. careless mistake. meant to use: distance = 0.5accelerationtime(squared) to get the answer.

forgot to add in the other units to the equation.
heh.