- #1
karljohan
- 3
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Homework Statement
Hello, i got three different assignments i need help with right now, my teacher overestimated me and my physics skills, so I'm kind of lost on these three:
(i'm european so i work with meters)
1:
A planets radius is 10 000 km. the gravitationalacceleration is g0 = 15 m/s^2 on the planets poles.
The gravitationalacceleration on the equator is ge = 0 m/s^2
How fast does the planet rotate?
2:
A cyclist is riding his bike in a circle, his speed is v = 72 km/h and the radius of the circle is r = 25 m
what's the angle alpha?
http://sv.tinypic.com/view.php?pic=xgjqef&s=8#.Vhp9zytbfo0
3:
a piece of garbage is hanging from a line. the mass of the garbage is m = 20 kg
The line forms the angle alpha = 5 degress (watch my picture) the the tension of the line?
http://sv.tinypic.com/view.php?pic=14l5ra&s=8#.Vhp_MStbfo0
The Attempt at a Solution
1: I'm clueless.
2: clueless
3: I'm thinking of dividing the counter force into two vectors, one vertical and one horizontal. and then somehow achieve an answer.
I'm on thin ice please help godsspeed.
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