Power problem - finding altitude change

In summary, a rider on an electric scooter with a battery capable of supplying 140 watt hours of energy and a combined weight of 860 N will be able to achieve an altitude change of approximately 1.8E-5 meters while driving in hilly terrain, taking into account friction forces and other losses. However, this calculation may require further explanation and assistance in order to be accurate.
  • #1
apang42
2
0

Homework Statement



An electric scooter has a battery capable of supplying 140 Wh of energy. If friction forces and other losses account for 60.0% of the energy usage, what altitude change can a rider achieve when driving in hilly terrain, if the rider and scooter have a combined weight of 860 N?

Homework Equations



Ubattery= 140(.6)/3600s = .015556W
Ug= mgh

The Attempt at a Solution



.015556 = 860h
h = 1.8E-5
this is incorrect.

can anyone point me in the right direction? thanks for your help!
 
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  • #2
Units: What is the definition of a Wh?
 
  • #3
Wh = watt hours
 
  • #4
But what does "Watt hours" mean? What does "140 Watt hours" mean? Can you explain that in words? It will help you with the problem. (If you're not sure, search for the definition of a kWh, a kilowatt hour.)
 
  • #5
you can get J out of it right? Then since you have J there is some equation to get m. maybe mgh? I don't know I need help on this problem too.

Thanks,
C
 
  • #6
csg39 - in reply to your private message, please post the problem in the forum, including your attempts at a solution so far, where everyone can see and help.
 
  • #7
its the same problem as above.
 
  • #8
so i solved for velocity by using P=Fv=(mg)v
 
  • #9
csg39 said:
so i solved for velocity by using P=Fv=(mg)v
You'd need to explain how you did that - what you wrote down and what your thought process was - for people to be able to help you on here.

My other tip, if you're still stuck, would be to have a go at answering the question in post 4 of this thread.
 
  • #10
Hw can U equate power with mgh i.e energy?
 

FAQ: Power problem - finding altitude change

How does power affect altitude change in an aircraft?

Power plays a crucial role in determining altitude change in an aircraft. The power output of the engines directly affects the amount of thrust generated, which in turn determines the rate of climb or descent of the aircraft. Increasing power will result in a higher rate of climb, while decreasing power will cause the aircraft to descend.

What is the relationship between power and airspeed in altitude change?

The relationship between power and airspeed is directly proportional when it comes to altitude change. In other words, increasing power will result in a higher airspeed, which in turn will lead to a higher rate of climb. Similarly, decreasing power will result in a lower airspeed and a lower rate of climb.

How do changes in air density affect power and altitude change?

Changes in air density can greatly affect the performance of an aircraft's engines and therefore its ability to change altitude. In thinner air at higher altitudes, the engines will produce less power, resulting in a slower rate of climb. On the other hand, denser air at lower altitudes will allow the engines to produce more power, resulting in a faster rate of climb.

Can the type of aircraft affect the power required for altitude change?

Yes, the type of aircraft can greatly affect the power required for altitude change. Factors such as weight, engine type and size, and aerodynamic design all play a role in determining the amount of power needed for altitude change. For example, a larger and heavier aircraft will require more power to climb compared to a smaller and lighter aircraft.

How can pilots manage power during altitude change?

Pilots have various tools and techniques at their disposal to manage power during altitude change. They can adjust the throttle or engine power output to control the rate of climb or descent. Pilots can also use the aircraft's autopilot system, which can be programmed to maintain a specific power setting for a desired altitude change. Additionally, pilots can also use pitch control to manage power, as a higher pitch angle will require more power for altitude change.

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