The synthesis of nitrogen trihydride from nitrogen gas and hydrogen gas is shown by which balanced chemical equation? a) n2(g) + h2(g) → nh3(g) b) n2(g) + 3h2(g) → 2nh3(g) c) 2nh3(g) + 3h2(g) → n2(g) d) 2nh3(g) → n2(g) + 3h2(g)

Which of the following is a true statement about the acceleration ~a of the pendulum bob ~a is equal to the acceleration due to gravity. ~a is perpendicular to the bob’s trajectory. ~a is equal to the instantaneous rate of change in velocity. ~a is tangent to the bob’s trajectory.