- #1
Cummings
- 53
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I am upto Motion in my studies, but the last time i studied it was a year ago and i am trying to get into swing of it again.
2 question that bug me at the moment.
1.
A plane is flying due south at 100m/s on an initially still day. Then a crosswind with a velocity of 25m/s towards the west beings to blow.
- What is the velocity of the plane under the influence of this crosswind?
- In which direction should the pilot steer the plane to maintain a velovity of 100m/s south?
I used a simple vector sum:
vplane = 100
vair = 25
vsum = square root((vplane^2)+(vair^2))
i got vsum = 103.08m/s
and the direction is South 14Degrees West.
I think that's right, the answer states its 10^3 ..but i think they accidentely put the 3 as a power. 10^3 not 103
2.
A car traveling with a constant speed of 80 km/h passes a stationary motercycle policeman. The policeman sets off in pursuit, acceserating to 80km/h in 10s and reaching a contstant speed of 100km/h after a further 5s. At what time will the policeman catchup with the car?
This question really made me think of last years studies, but i couldn't get my head around it. After the 15 seconds i can find out how far the car and policemen have traveled, but can't figure it out further.
Thanks for your time,
Cummings
Cummings@softhome.net
2 question that bug me at the moment.
1.
A plane is flying due south at 100m/s on an initially still day. Then a crosswind with a velocity of 25m/s towards the west beings to blow.
- What is the velocity of the plane under the influence of this crosswind?
- In which direction should the pilot steer the plane to maintain a velovity of 100m/s south?
I used a simple vector sum:
vplane = 100
vair = 25
vsum = square root((vplane^2)+(vair^2))
i got vsum = 103.08m/s
and the direction is South 14Degrees West.
I think that's right, the answer states its 10^3 ..but i think they accidentely put the 3 as a power. 10^3 not 103
2.
A car traveling with a constant speed of 80 km/h passes a stationary motercycle policeman. The policeman sets off in pursuit, acceserating to 80km/h in 10s and reaching a contstant speed of 100km/h after a further 5s. At what time will the policeman catchup with the car?
This question really made me think of last years studies, but i couldn't get my head around it. After the 15 seconds i can find out how far the car and policemen have traveled, but can't figure it out further.
Thanks for your time,
Cummings
Cummings@softhome.net