Re: Calculate force given power

On Apr 14, 9:23 pm, "hhc...@xxxxxxxxx" <hhc...@xxxxxxxxx> wrote:
On Apr 14, 8:04 pm, DavidBrown...@xxxxxxxxx wrote:

I need to describe the motion (acceleration, velocity, time) of a
vehicle moving on a surface that may or may not be inclined, taking
into account rolling resistance and air drag, including wind. That
would be easy enough if I had a force, but I only have the power input
and mass. I know P = F · v, but the vehicle starts at rest, and
division by 0 doesn't work well. Anybody have any clue how I can go
about solving this.

Sounds to me that the prof at your school who gave you this problem
was working in a depth far over his head, unless you may have mistated
the homework problem.

What was the exact wording of your homework problem?

Harry C.

It's not even a physics problem. We're supposed to be learning
Matlab. The Matlab I got down, I'm just stuck on the physics here.
We're dealing with a hypothetical human-powered vehicle.

Prompt the user to input the distance, direction, and grade of each
leg of a trip.
Prompt the user to input their weight and height to calculate their
input power.
Prompt the user to input wind speed in mph, wind direction, and road
roughness of course.
Plot the velocity and distance traveled versus time.
Plot an elevation view of the course.
Output a summary of the trip stating at least the total distance
traveled, average velocity, and elevation change of the trip.

I know that
power = 600 - 5 * ln(10 * (time + 0.1)) - abs(bmi_prime) * 20

The issue is how that power converts to force.
.

Relevant Pages

  • Re: Calculate force given power
    ... vehicle moving on a surface that may or may not be inclined, ... What was the exact wording of your homework problem? ... Output a summary of the trip stating at least the total distance ... and instead assume that the HPV is always travelling at terminal velocity. ...
    (sci.physics)
  • Re: Faster Than c Communication.
    ... >>the wind much more counter intuitive. ... >>But it IS possible to make such a vehicle. ... >>which drives the cart downwind faster than the wind. ... >>The propeller is blowing the air in the opposite direction ...
    (sci.physics.relativity)
  • Re: Mobile S-Rotor!
    ... >>> requirements from the vehicle engine to turn the alternator have always ... >> engine must supply 4000 watts to drive that alternator under full load. ... >>> that the car moves through the wind at 60 mph or that the wind moves ... > lift is created along the length of the blade. ...
    (sci.energy)
  • Re: Energy Vortex Discovered on the Hayward Fault
    ... career I drove, daily, a very large Crew Carrying Vehicle. ... The only exceptions, not really dust-devils, ... gradients far stronger than for dust devils. ... the wind could only be described ...
    (sci.geo.earthquakes)
  • Re: Energy Vortex Discovered on the Hayward Fault
    ... never likely to see an American desert dust devil, ... career I drove, daily, a very large Crew Carrying Vehicle. ... doesn't take much wind velocity to pick up dust, ... exceptions, not really dust-devils, were fire-whirls which appeared to be ...
    (sci.geo.earthquakes)
Quantcast