Recent content by frog210293

1. Co efficent of static friction

Homework Statement a) If the co efficent of static friction between a table and a uniform massive rope is Us, what fraction of the rope can hang over the edge of the table without the rope sliding? Homework Equations F=mg The Attempt at a Solution The largest fraction of the...
2. Significant figures

What is the number 227.32 related to? if you measured it your significant figures would be related to the accuracy of the measuring instrument. If it was from a question the i would just use the amount of significant figures that was used in the numbers in the question.
3. Determining values of resistance, voltage, and current throught a circuit

Firstly, with the battery the smaller line (on the left) is negative, the other is positive. You should be able to work out which side of the V is negative and which is positive from that. The A is just showing that there is 1.5amps flowing through the circuit at that point. That's the best i...
4. 3 mass, 2 pulleys help please

I will leave this to someone who has more of an idea of what they are doing, the only thing i can see is that you have wrote down the angle as 30 degrees on the diagram when it says 35 degrees in the box underneath. Other then that I'm at as much of a loss as you are.
5. Basic speed/time/distance equation

I have no idea. now we have 2 variables to try and solve. once the ? is known then the rest is simple enough. As we basically have d/s + d/s and we know the speeds, i only need to find the distance she has to run at 7.8m/s as you said. so she runs x/10km at 3.7ms per second she then needs to...
6. Basic speed/time/distance equation

is this the only answer for this question? its coming up as an incorrect answer sorry
7. Basic speed/time/distance equation

ok, thanks a lot otherwise i wouldn't of had a clue how to get this one right
8. Basic speed/time/distance equation

ok so we so 2703 + 1282.05 = 3985.05s then d = s / t d = 0.474 /3985.05s d= 10000-9962.6 d= 37.4m from the finish? that doesn't sound right sorry i havn't done any sort of equations in a long time
9. Basic speed/time/distance equation

Ok then i didn't think it was going to be quite that easy but couldn't think of any other way to do it. So the equation should look something like t= (2702.702s - 2400s)*7.8m/s or is that basically making the same mistake still?
10. Basic speed/time/distance equation

Homework Statement A runner is planning for a 10km race. She can maintain a steady speed of 3.7 m/s for as much time as needed before ending the race with a 7.8 m/s sprint. If she wants to finish in 40min or less, how far from the finish should she begin to sprint? Homework Equations S =...
11. Average volume gained each day

ohh woops i redid it with the brackets and came up with 1.18*10^-5 but this is still wrong?
12. Average volume gained each day

Homework Statement If the child's birth mass is 3.3 kg, birth rate =1.2×10−2 kg/d (baby gains that amount each day) A child is born after 39 weeks in its mother's womb. Assuming the fetal density is 1020 kg/m^3, what is the average volume gained each day? Homework Equations The...