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# Physics Question help.

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1. If anyone can help answer this question much appreciated.

A car has a maximum power output of 30 kW and a total mass of 1675 kg. What will be its maximum speed when it ascends a maximum incline of 15 % assuming:

(a) B) no resistance forces.[12 Marks]
(b) A) constant resistance of 1.5 kN.[15 Marks]
2. (Original post by Kieranb34)
If anyone can help answer this question much appreciated.

A car has a maximum power output of 30 kW and a total mass of 1675 kg. What will be its maximum speed when it ascends a maximum incline of 15 % assuming:

(a) B) no resistance forces.[12 Marks]
(b) A) constant resistance of 1.5 kN.[15 Marks]

for part a, power=force x velocity, and as it would be travelling at a constant velocity, you can find the driving force by resolving the weight of the car and finding the component parallel to the slope.
3. a) Alex's response is correct.
Spoiler:
Show

Find the force using , where
...
Rearrange and solve for v.
b) If there is a driving force of and a resistive force, what is the overall force acting on the car?
Hint:
Spoiler:
Show
The resistive force goes against the driving force of the car...
Other than this, the method is the same.
4. (Original post by Kieranb34)
If anyone can help answer this question much appreciated.

A car has a maximum power output of 30 kW and a total mass of 1675 kg. What will be its maximum speed when it ascends a maximum incline of 15 % assuming:

(a) B) no resistance forces.[12 Marks]
(b) A) constant resistance of 1.5 kN.[15 Marks]
I got the answer for (a) as 7 m/s ...
Tell me whether the answer is correct so that i can explain you how to get it ( say me if you don't have the answer )
5. (Original post by The-Spartan)
a) Alex's response is correct.
Spoiler:
Show

Find the force using , where
...
Rearrange and solve for v.
b) If there is a driving force of and a resistive force, what is the overall force acting on the car?
Hint:
Spoiler:
Show
The resistive force goes against the driving force of the car...
Other than this, the method is the same.
Spartan...DO NOT REPEAT the same DIAGRAM for every answer you give..
Your diagram does not explain this situation clearly.....
So do not try to use the same diagram as it would complicate the person having the doubt more and more...
Sorry to say this....but this is the truth
6. (Original post by NNB_Herath)
Spartan...DO NOT REPEAT the same DIAGRAM for every answer you give..
Your diagram does not explain this situation clearly.....
So do not try to use the same diagram as it would complicate the person having the doubt more and more...
Sorry to say this....but this is the truth
That diagram is a great diagram
It works for this situation, the car is shown up an incline of
the forces can still be resolved using that method...
Works well :P
7. (Original post by The-Spartan)
That diagram is a great diagram
It works for this situation, the car is shown up an incline of
the forces can still be resolved using that method...
Works well :P
It would work ...
But it would also complicate the person in trouble due to those DIRTY LINES which makes this SIMPLE situation a bit MORE COMPLICATED...

Better draw your own diagram bro

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