Solving the Mystery: Calculating Terminal Velocity

AI Thread Summary
The discussion revolves around calculating the effective area needed for a hero to reduce his terminal velocity using a tarp, given that he shares the same mass and density as a skydiver. The skydiver has a terminal velocity of 60 m/s and an effective area of 0.70 m². The hero's drag coefficient is twice that of the skydiver, complicating the calculation of his effective area. Participants express difficulty in determining the necessary variables, such as air density and drag coefficient, to rearrange the drag force equation. The conversation emphasizes understanding the relationship between drag force and effective area to solve the problem.
Zmuffinz
Messages
6
Reaction score
0

Homework Statement



Marks: 1 In a recent mystery, the hero saves himself by spreading out a windshield tarpaulin to reduce his terminal velocity. A skydiver of 75 kg mass has a terminal velocity of 60 m/s. If the hero has the same 75 kg mass, the same density as the sky diver, and a drag coefficient twice as large with the tarp, by what factor is his effective area greater than the 0.70 m2 area of the skydiver?

Homework Equations



Drag force= 1/2DPairAV^2

The Attempt at a Solution

 
Physics news on Phys.org
Zmuffinz said:

Homework Statement



Marks: 1 In a recent mystery, the hero saves himself by spreading out a windshield tarpaulin to reduce his terminal velocity. A skydiver of 75 kg mass has a terminal velocity of 60 m/s. If the hero has the same 75 kg mass, the same density as the sky diver, and a drag coefficient twice as large with the tarp, by what factor is his effective area greater than the 0.70 m2 area of the skydiver?

Homework Equations



Drag force= 1/2DPairAV^2

The Attempt at a Solution

You seem to have forgotten to complete section three.
 
Last edited:
yea i didnt know what to do for the question, i can't get the density of air or drag coeffient so i can't work anything out by rearranging the equation for A
 
Zmuffinz said:
yea i didnt know what to do for the question, i can't get the density of air or drag coeffient so i can't work anything out by rearranging the equation for A
HINT: What do you know about the drag force in both cases?
 

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 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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

Terminal velocity of a skier using a Momentum Balance
Replies
1
Views
2K
How do I find the terminal speed of a body in water?
Replies
13
Views
4K
Question on Terminal Velocity finding time
Replies
6
Views
2K
Terminal Velocity of a skydiver
Replies
1
Views
2K
Terminal Velocity: How does one explain why the squirrel gets undamaged?
Replies
13
Views
23K
Terminal Velocity of Cube: 1.6 m/s
Replies
2
Views
7K
How Is Terminal Velocity Calculated in a Submerged Block System?
Replies
2
Views
2K
Terminal Velocity's Relationship to Mass
Replies
2
Views
3K
Drag, terminal velocity, and force.
Replies
9
Views
5K
Calculating Terminal Velocity for a Falling Object with Air Resistance
Replies
4
Views
8K

Hot Threads

Recent Insights

Back
Top