Athin ribbon of magnesium burns in the air creating a really bright light. when it is finished burning, there is only a powder white substance in its place. which option best explains where the white powder came from?

a. a magnesium ribbon disappeared leaving instead an ash left over from burning that was white and powdery (instead of dark grey like a piece of wood burning).

b. the white powder is a combination of magnesium and something in the air.

c. the white powder atoms were the magnesium ribbon changing into a different element.

d. the white powder atoms came from the atmosphere originally.

Ogle–2013–blg–0723 is an exoplanet that is similar to earth in size and proximity to its star. this exoplanet has mass m=4.18×1024kg and radius r=5.66×106m. an astronaut whose weight on earth is w=735n lands on the planet. a. calculate m, the mass of the astronaut. b. calculate gp? , the acceleration due to gravity on the surface of ogle–2013–blg–0723. c. calculate wp? , the weight of the astronaut on the surface of ogle–2013–blg–0723. d. calculate v, the minimum velocity required to put an object into orbit above ogle–2013–blg–0723. e. calculate t, the time required to complete an orbit around ogle–2013–blg–0723.

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?

Aball horizontally thrown from a cliff at 8m/s