Two students are discussing the Sun. Which student is correct? Student 1: Nuclear fusion powers the Sun, so activity like sunspots and flares must be caused by a change in the fusion rate or the type of fusion. Student 2: Fusion is constant, keeping the Sun a nice temperature; changes on the surface are caused by the Sun's magnetic field.
the activation energy is 10 kj and the reaction is exothermic.
weight = (mass) x (acceleration of gravity)
acceleration of gravity = 9.81 m/s² on earth, 1.62 m/s² on the moon.
the feather's weight is . .
on earth: (0.0001 kg) x (9.81 m/s²) = 0.000981 newton
on the moon: (0.0001 kg) x (1.62 m/s²) = 0.000162 n
the presence or absence of atmosphere makes no difference. in fact, the numbers would be the same if the feather were sealed in a jar, or spinning wildly in a tornado, or hanging by a thread, or floating in a bowl of water or chicken soup. weight is just the force of gravity between the feather and the earth. it's not affected by what's around the feather, or what's happening to it.