How quickly are you moving relative to the ground?

AI Thread Summary
To determine the speed relative to the ground while walking to the restroom on a moving bus, the equation vpg = vpb + vbg is used. The bus is traveling at 120 km/h, which converts to 33.4 m/s. When walking at 2.5 m/s towards the back of the bus, the total speed relative to the ground is calculated as 33.4 m/s + 2.5 m/s, resulting in 35.83 m/s. It's crucial to consider the direction of movement, as speeds in opposite directions should not be added directly. Understanding these principles is essential for accurately calculating relative motion.
emily081715
Messages
208
Reaction score
4

Homework Statement


On a long bus ride, you walk from your seat to the back of the bus to use the restroom. The bus is driving at 120 km/h , and you walk at 2.5 m/s from your seat to the restroom.
How quickly are you moving relative to the ground?

Homework Equations


vpg=vpb+vbg

The Attempt at a Solution


120 km/h= 33.4m/s[/B]
vpg= 33.4+ 2.5= 35.83 m/s
 
Physics news on Phys.org
Be careful about what direction the bus and you are going. Use the appropriate sign for each. You shouldn't add if they are in opposite directions.
 

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

Relative motion problem with airplane and wind velocity
Replies
5
Views
4K
Relative vectors - how do you determine?
Replies
1
Views
2K
Questions related to Kinematics
Replies
12
Views
2K
Frames of reference and vectors problem
Replies
4
Views
1K
Frame of reference/ time dilation
Replies
4
Views
2K
What is your velocity relative to the bus?
Replies
9
Views
2K
Velocity of points on a moving wheel relative to the ground
Replies
1
Views
3K
How can you accurately hit a trash bin while biking with an apple core?
Replies
47
Views
6K
Solve Vector Prob: Find Speed in m/s Relative to Ground
Replies
5
Views
2K
Relative Velocity of a pickup truck
Replies
1
Views
9K

Hot Threads

Recent Insights

Back
Top