Average Power delivered to Engine

In summary, a 1000 kg car accelerates uniformly from rest to 15 m/s in 10 seconds, with air resistance at a constant 300N. To find the average power delivered by the engine, the equation for average power (work/time) is used. The force of the car is calculated by multiplying its mass (1000 kg) by its acceleration (15 m/s), resulting in 15000N. To factor in air resistance, this force is multiplied by the magnitude of displacement (x), which is represented by 1800 in this case, to get a final answer of 13500 W.
  • #1
davidatwayne
9
0

Homework Statement


A 1000 kg car, starting from rest, accelerates uniformly to 15 m/s in ten seconds. Assume air resistance is constant at 300N. What is the average power delivered by the engine?

Answers
a. 13500 W
b.18000 W
c. 23000 W
d. 27000 W

Homework Equations


Average power = work/time
work = force(x) where x is magnitude of displacement.
force= mass x acceleration


The Attempt at a Solution



the force is equal to 1000 kg x 15 m/s = 15000

I don't know how to factor in air resistance, or arrive at a final answer. The answer is A...
 
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  • #2
explain how you got the force of the car again...
 
  • #3
force = mass times acceleration
1000 x 15= 15000
 
  • #4
what is the units of the 15 value though
 
  • #5
ok... i think i got it... after getting the correct force (and units) times the displacement of x, (1800 * 75)/10... gives the correct answer.

thanks.
 

What is average power delivered to an engine?

The average power delivered to an engine is a measure of the average amount of work done by the engine over a certain period of time. It takes into account the amount of power produced by the engine and the duration of its operation.

How is average power delivered to an engine calculated?

The average power delivered to an engine can be calculated by dividing the total work done by the engine by the total time it took to do that work. This can be represented by the equation P = W/t, where P is average power, W is work, and t is time.

What factors can affect the average power delivered to an engine?

Several factors can affect the average power delivered to an engine, including the size and design of the engine, the type and quality of fuel used, the efficiency of the engine's combustion process, and the external conditions in which the engine is operating (such as temperature and altitude).

Why is it important to measure the average power delivered to an engine?

Measuring the average power delivered to an engine is important for several reasons. It can help determine the efficiency of the engine and identify any issues that may be affecting its performance. It can also be used for maintenance and troubleshooting purposes, as well as for comparing different engines or engine models.

How can the average power delivered to an engine be optimized?

The average power delivered to an engine can be optimized by regularly maintaining and tuning the engine, using high-quality fuel, and ensuring that the engine is operating under optimal conditions (such as maintaining proper air-to-fuel ratio and avoiding excessive load). Additionally, using more efficient engine designs and technologies can also help improve the average power delivered to an engine.

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