Recent content by Dave25

Got it! Thanks.

Homework Statement Suppose 69.3 J of heat is added to a 121 g piece of aluminum at 22.5 C. What is the final temperate of the aluminum? Homework Equations Q = m c (T - T1) I think, but I am only given 1 temp. The Attempt at a Solution There are examples that are simialr in my...

Hey, thanks. I just read that in my book, I appreciate your help.

I have an equation in my study guide that looks like this: a = F/m = P/v/m = (47 horsepower * 746 W/hp) / (1400kg) (14m/s) = 1.82 m/s^2 My question is, how does my book come up with 746 W/hp? I know why all of the other factors...

Thanks a lot.

How do you find the coefficient of kinetic friction?

Yeah, I understand it now. Thanks a lot.

Sorry about all the posts. I have a test tomorrow and I am kinda freaking out.

So, will adding these forces like I have above give me the correct answer?

How about this: my normal force = 10.6 N (approx. 11N) Then, 7.5 kg * 9.8m/s^2 * sin13 = 16.5 (approx. 17N) Can I add these together to get my answer of 28 N?

Is this correct: mg(cos13 + sin13) / cos13 + sin 13) ? I saw this equation to a similar question but it does not seem to work on this one.

Thanks everyone. I think I got the answer for this one.

I have seemingly tried all possible ways and yet the harder I try the more confused I get. I have looked in the back of my book to find the answer to be 28 N, yet I do not know how to get there. If someone could tell me the general equation I would really appreciate it. Thanks.

Thanks for all of the help everyone. So are these force equations right? F(x) = N sin13= mg F(y) = mg / cos 13 I don't think they are cause I'm not getting the right numbers. I am trying to draw a free body diagram, but I am still confused. Any more helpful hints you guys could give me...

Homework Statement A shopper pushes a 7.5 kg shopping cart up a 13 degree incline. Find the magnitude of the horizontal force needed to give the cart an acceleation of 1.41 m/s^2. Homework Equations F = m * a The Attempt at a Solution I am not sure how to set up the F(x) and...