Dynamics Question: Calculate Resistive Force on Car

  • Thread starter Thread starter K.QMUL
  • Start date Start date
  • Tags Tags
    Dynamics
AI Thread Summary
To calculate the total resistive force acting on a car coasting at a constant speed of 72 km/h, the car's mass is given as 1600 kg, and the road has a gradient of 200m decline over 6000m. The resistive forces, including friction and air resistance, must counteract the gravitational force component acting along the slope. Using the equation P=FV and f=ma, the resistive force can be derived from the gravitational pull due to the slope. The solution requires applying these principles to find the total resistive force acting on the car.
K.QMUL
Messages
54
Reaction score
0

Homework Statement



Along a certain section of road a car (mass 1600kg) will coast in neutral at a constant speed of 72 km/h if there is no wind. Examination of a topological map shows that for this section of road the elevation decreases by 200m for each 6000m of road. What is the total resistive force (friction plus air resistance) that acts on the car when it is traveling at 72 km/h?

Homework Equations



P=FV, f=ma

The Attempt at a Solution



Please see the image attached

-Thanks for any help
 

Attachments

  • 20131013_193246.jpg
    20131013_193246.jpg
    33.1 KB · Views: 497
Physics news on Phys.org
Seems fine to me!
 
  • Like
Likes 1 person

Thread 'Errors and significant figures'

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...
View full post »
Thread 'A cylinder connected to a hanging mass'

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...
View full post »

Similar threads

Problem with the power of car
Replies
3
Views
821
How Do You Calculate Race Car Acceleration and Power Output?
Replies
20
Views
2K
Cars rounding a slippery banked corner in the rain
Replies
20
Views
3K
Tractive Force = 3554 N"Racing Car Acceleration: Find the Tractive Force
Replies
3
Views
2K
Driving force of a car experiment
Replies
12
Views
2K
Electric car and battery problem
Replies
12
Views
2K
How Far Will a Car Travel Before Stopping Without ABS at 115.2 km/h?
Replies
5
Views
2K
Calculating Work Done by Car Engine
Replies
8
Views
2K
What Is the Resistive Force Acting on a Car Coasting at Constant Speed?
Replies
1
Views
2K
How Does a Car's Velocity Change When It Moves Down an Inclined Plane?
Replies
22
Views
3K

Hot Threads

Recent Insights

Back
Top