Pour réaliser l'équilibre du système, il faut exercer en E une force
d'intensité 40N.
a) Quelle est l'indication du
dynamomètre ? (dont la masse
est négligeable)
b) Quelle est la masse de l'objet
suspendu en S?
c) Quel est le déplacement du
point S si E se déplace de 0,25
m ?
On donne : g = 9,8N/kg et M =
Р

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

If a hiker that weighs 600 newtons climbs a 50 meter hill, how much gravitational potential energy has the hiker gained?