A car speeding up from rest to constant accel. travels 130m in 6s. How far in

  • Thread starter Thread starter Butterfly30
  • Start date Start date
  • Tags Tags
    Car Constant Rest
AI Thread Summary
A car accelerates from rest and covers 100 meters in 6.04 seconds, prompting a calculation for the distance traveled in the first 2.37 seconds. The initial approach involves calculating average velocity by dividing total distance by total time, resulting in 16.5 m/s. However, using this average velocity to find distance for the first 2.37 seconds yields an incorrect result. Suggestions include drawing a velocity vs. time graph to better understand the acceleration and calculate the distance accurately. The discussion emphasizes the importance of proper calculations and graphical representation in solving motion problems.
Butterfly30
Messages
28
Reaction score
0
A car speeding up from rest to constant accel. travels 100 meters in 6.04s. How far did it travel in the first 2.37 seconds?

So I figure if I divide distance by time 100/6.04 it will give me the velocity 16.5m/s. And since distance = vt I would do d=15.6*2.37 which equals 37.03m but this is wrong. I was also told to try drawing a graph of velocity vs time...but how can I graph numbers such as these (high and low #'s with decimals) If I can't graph it I can't find the slope or y intercept...so I'm lost
 
Last edited:
Physics news on Phys.org
Draw a graph of velocity vs. time.
Distance travelled=velocity x time
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
Back
Top