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# Can someone help me with physics?

Topic: Can someone help me with physics?
July 18, 2019 / By Ronalda
Question: What is the acceleration (in meters/ second^2) of a freely falling 77.0kg sky-diver, if air resistance exerts a force of 264N? Ive been trying to figure out this problem for hours. I failed four attempts and I have one more attempt. This is the equation that I used to figure out the problem Fn=m(-g+a) when i didnt it that way i got an answer of 13.23 and it told me I was wrong. I also tried this equation F=ma and I got 3.4 and it said I was wrong Can some one please help me with this problem? Are you sure the answer is a positive 6.38 and not a -6.38? I have one more attempt and I want to make sure I put the right answer.

## Best Answers: Can someone help me with physics?

Molly | 6 days ago
To solve this problem, all we need to do is to sum the forces in the y or vertical direction. So we have: F(y) = F(r) - m*g = m*a where F(r) is the resistance force acting in the positive (up) direction, m is the mass of the sky-diver, g = 9.81 m/s^2, and a is the acceleration we are looking for. So plugging in what we have and solving for a gets us: 264 - (77.0)*(9.81) = (77.0)*a a = -6.3814 m/s^2 Now the answer is negative because I called up positive, so if we look at only the magnitude and we keep the correct number of significant figures, we are left with: a = 6.38 m/s^2 {ANSWER} Hope this helps!
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Originally Answered: If one asks what physics an engineer should know, and you hand them the classic concise text on Physics for Engineers, is that inadequate?
Maybe they expect sources and a bibliography in APA format. A thesis and a conclusion are mandatory as well MLA might be accepted...
Originally Answered: If one asks what physics an engineer should know, and you hand them the classic concise text on Physics for Engineers, is that inadequate?
Taken from the foreword: "Although additional research in this area is clearly needed, this study leads to the unambiguous conclusion that the differences in the compensation of men and women are the result of a multitude of factors and that the raw wage gap should not be used as the basis to justify corrective action. Indeed, there may be nothing to correct. The differences in raw wages may be almost entirely the result of the individual choices being made by both male and female workers." The key words there are "may be," and "almost entirely." Your report neither proves nor disproves any gender discrimination. The words "gender inequality," and "gender discrimination" do not even appear in your report. It only provides other reasons contributing to the wage gap.

Linnie
Vertically, we have gravity (Fg) and the resistance force (Fr). The resistance force opposes gravity so give it a negative sign and use F net = ma: F net = ma Fg - Fr = ma mg - Fr = ma [mg - Fr] / [m] = a You know everything, so just sub it in: [(77.0 kg)(9.81 m/s^2) - 264 N] / [77.0 kg] = a 6.38 m/s^2 = a Done! P.S. Try g = 9.8 m/s^2 instead of 9.81 m/s^2 if that doesn't work. Edit: It depends on whether you choose down as positive or negative. The fact that the value they gave you for the air resistance is positive suggests that [up] is positive (since gravity is downwards and the resistance opposing gravity), which would mean that the acceleration is negative - but maybe I'm over-thinking this. If they've told you that g = -9.8 m/s^2 in other questions (or this one), then put the answer as negative because that means that they want down to be negative. It's your call hombre.
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Kalla
so ap physics is only relatively troublesome, and as consistently relies upon on the instructor besides (is he/she a solid instructor? plenty or little artwork, etc...) additionally relies upon on what else you're taking once you're taking ap physics, if the different training are not troublesome and you could concentration on the class, then it relies upon and it relies upon on you, and how the concern is for you, and how troublesome you prefer to artwork at it sorry if this would not help, yet there are various aspects...
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Originally Answered: How is this girl in my general physics class (physics 1) at a community college a computer engineering major.?
I get your problem but I don't think you've given enough information to solve it. So you're good at math but not physics word problems. I think the gap between those two is usually figuring out which quantities go in which variable. Keep in mind that sometimes you might use one formula more than once in a problem, with different instances of the variables, e.g. v1, v2. Just practice a ton of word problems. Don't even worry about solving them, just set them up. Don't worry about what subjects within physics they're based on. Pick the subject you're most comfortable with, and practice a bunch of word problems on that.

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