Tagged Questions
-1
votes
1answer
34 views
Projectile motion: Thrust in x direction = acceleration in x direction? [closed]
I understand that in projectile motion, when an object is solely under the influence of gravity, there is no acceleration in the $x$-direction (with the acceleration due to gravity in the $y$ ...
0
votes
0answers
51 views
How to calculate the necessary force to hold a bearing? [closed]
Assume I have a ball bearing which is holding radial load (gravity load) 100lb. The axial rotation has 500 lbf-in. How I can set up the equations to find out the necessary force to hold the bearing to ...
1
vote
3answers
340 views
Calculate kinematics of body movement from the set of spatial coordinates
Short intro
I have a set of 3D (x,y,z) spatial coordinates of arm movement obtained using motion capture system. The example set of such coordinates looks like this (rounded up):
...
0
votes
2answers
162 views
Human Kinematics:Does velocity or acceleration become zero at the moment of changing human limbs' direction of movement?
I need to know the answers to following questions about human kinematics. Can anyone kindly help me with it?
When human moves hand in one direction then suddenly or not changes direction of hand ...
0
votes
0answers
130 views
Meeting Of 2 People On a circular track [closed]
Two persons are running on a circular track either in the same direction or in the opposite direction, indefinitely.
The speed of both of them is given to you.
Speed will be positive in clockwise ...
1
vote
1answer
115 views
why does perpendicular motion to the direction of someone' s approach does not affect the distance between them
I was reading about the the four turtles/bugs math puzzle
Four bugs are at the four corners of a square of side length D. They start walking at constant speed in an anticlockwise direction at all ...
1
vote
2answers
156 views
Should the cold drink come out of a free falling bottle with an open lid?
If I hold an open bottle and perform free fall, say sky diving, along with it from, say 10000ft, while I'm holding the bottle vertically upwards should the cold drink come out of the bottle? Kindly ...
0
votes
2answers
190 views
Find vector position in time give this graph?
Graph is position x position. There are 3 points, $A$, $B$ and $C$.
$A(0,2)$
$B(4,2)$
$C(6,0)$
Particle travels from $A$ to $B$ and from $B$ to $C$ at constant $v = 2 ~m/s$.
Find vector ...
0
votes
2answers
332 views
How to compute drag coefficient given initial position, initial velocity and final resting position?
The equations I'm using are:
x = x + (DT * vx)
vx = vx * C
My DT is always 0.01 and the coefficient C (related to a linear ...
7
votes
5answers
535 views
Should you run when under rain?
When it's raining, would you get less wet if you run or more wet?
I think you will get less wet, because rain is coming down in a constant volume and if you run you will have a shorter amount of time ...
0
votes
2answers
785 views
What do I need to do to find the stopping time of a decelerating car? [closed]
The question is:
A car can be stopped from initial velocity 84 km/h to rest in 55 meters. Assuming constant acceleration, find the stopping time.
Sorry for my ignorance, but I need to review ...
0
votes
2answers
663 views
Position in circular motion
Is it possible to determine the position of a particle undergoing circular motion, in x-y coordinates, at any given time and velocity?
I'm thinking it has something to do with $\pi$
0
votes
3answers
242 views
Deccelerate and Accelerate to achieve timed journey
I have a vehicle traveling at initial speed $100\:\mathrm{m/s}$.
Expected destination speed is also $100\:\mathrm{m/s}$.
Maximum deceleration is $3$.
Maximum acceleration is $10$.
Distance to the ...
1
vote
1answer
1k views
Solving straight-line motion question for time
I apologise in advance if this question doesn't appeal to the advanced questions being asked in this Physics forum, but I'm a great fan of the Stack Exchange software and would trust the answers ...
