21. Which of the equations is balanced?

A) 2Li2O + H2O ⇒ 2LiOH

B) 3Fe + 3O2 ⇒ 2Fe2O3

C) 2N2 + O2 ⇒ 3N2O

D) 3Mg + N2 ⇒ Mg3N2

Convert 15 125 to a decimal using long division. A) 0.12 B) 0.15 C) 1.2 D) 7.4

Two uniform solid spheres of the same size, but different mass, are released from rest simultaneously at the same height on a hill and roll to the bottom without slipping. Part A Which of the following statements about these spheres are true? A.

Ommy was walking at a rate of 4 miles hour at noon and at 12:30 pm he was walking at a brisk rate of 6 miles hour . Two hours later Tommy was walking at a leisurely rate of 2 miles hour .

When two stars are bound together gravitationally and orbit a common mass, they're known as A. constellations. B. meteoroids. C. galaxies. D. binary stars.

Where in your environment can you observe some of the general properties of wave motion

What will happen if there is a change in a magnetic field?

Question 2 10 pts The voltage in a particular circuit is 10.0 V. The current in the circuit is 20 A. What is the resistance? A. 2.0 B. 30 C. 200 D. 0.5

Where in the motion is the magnitude of the net force on the object a maximum? where in the motion is the speed a maximum?

Which movies are longer than 2 hours?

A new object has been discovered in the solar system. In your own words, justify how the object can be proved to be a comet.