A student observes a chemical reaction. Aluminum (Al) + Oxygen (O) yields Aluminum Oxide (Al2O3)

She writes an equation that correctly displays the law of conservation of mass.

Select the balanced equation below that she wrote about this chemical reaction.

Group of answer choices

4Al + 3O2 --> 2Al2O3

4Al + 2O2 --> 3Al2O3

2Al + 3O3 --> 2Al2O3

Al + O2 --> Al2O3

If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? yourunits 3. a clothes dryer uses about 2 amps of current from a 240 volt line. how much power does it use? yourunits 4.

Asolid round steel rod 6.25 mm in diameter and 375 mm long is rigidly bonded to the end of solid square brass rod 25 mm on a side and 300 mm long. the geometric axes of the bare are along the same line. an axial tensile force of 5.4 kn is applied at the extreme ends of the assembly. for steel e = 200 gpa and for brass e = 90 gpa. determine the total elongation for the assembly.