9 J'apprends à rédiger
Utiliser une formule mathématique
EXERCICE CORRIGE
La valeur des forces de gravitation s'exerçant entre
deux objets A et B se calcule en utilisant la formule
maxm тв
FA/B = FB/A = GX
d
met me étant les masses des objets A et B (en kg)
et d la distance les séparant (en m).
- Comment évolue la valeur de ces forces lorsque
la distance entre les objets est multipliée par deux ?
D'après la formule, pour calculer cette valeur
on divise le produit G x mm, por d2
Donc, si la distance est multipliée par deux
la valeur de ces forces est divisée par 22
Elle est donc divisée par quatre.
A toi de rédiger !
- Comment évolue la valeur de ces forces lorsque le
masse d'un corps est multipliée par deux?

American eels (anguilla rostrata) are freshwater fish with long, slender bodies that we can treat as uniform cylinders 1.0 m long and 10 cm in diameter. an eel compensates for its small jaw and teeth by holding onto prey with its mouth and then rapidly spinning its body around its long axis to tear off a piece of flesh. eels have been recorded to spin at up to 14 revolutions per second when feeding in this way. although this feeding method is costly in terms of energy, it allows the eel to feed on larger prey than it otherwise could. 1.a field researcher uses the slow-motion feature on her phones camera to shoot a video of an eel spinning at its maximum rate. the camera records at 120 frames per second. through what angle does the eel rotate from one frame to the next? 2. the eel is observed to spin at 14 spins per second clockwise, and 10 seconds later it is observed to spin at 8 spins per second counterclockwise. what is the magnitude of the eels average angular acceleration during this time? 3. the eel has a certain amount of rotational kinetic energy when spinning at 14 spins per second. if it swam in a straight line instead, about how fast would the eel have to swim to have the same amount of kinetic energy as when it is spinning? 4.a new species of eel is found to have the same mass but one-quarter the length and twice the diameter of the american eel. how does its moment of inertia for spinning around its long axis compare to that of the american eel?

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

Which of the following statements is true about women and minorities in early psychology? a. in the early 20th century, numerous graduate schools recruited women and minorities to study psychology. b. opportunities in higher education were limited for women and minorities in the early 20th century due to discrimination. c. despite some obstacles, there were numerous employment opportunities for women and minorities. d. women and minorities were often selected to do academic research in an effort to make the field more diverse.