21. Which of the equations is balanced?

A) 2Li2O + H2O ⇒ 2LiOH

B) 3Fe + 3O2 ⇒ 2Fe2O3

C) 2N2 + O2 ⇒ 3N2O

D) 3Mg + N2 ⇒ Mg3N2

What voltage produces a current of 500 amps with a resistance of 50 ohms?

What is the amplitude of a wave related to

The density of an object is defined as its mass divided by its volume. Suppose the mass and volume of a rock are measured to be 8 g and 2.8325 cm^3.

High power laser has a beam diameter of 1 mm and generates an electric field with an amplitude of 0.9 MV/m at the target. Find the average power of the laser. a) 511 W b) 845 W c) 700 W d) 667 W e) 1040 W

A circuit is a continuous loop. a. True b. False

A transparent film laminated to a fabric is identified in the study material as a. stretch fabric. b. PVC. c. a skin. d. two-faced fabric

Technician A says that all friction and steel plates in a clutch pack should be replaced during and overhaul. Technician B says that the automatic transmission fluid cooler should always be flushed when a unit is rebuilt or replaced.

Cold water (cp = 4180 J/kg·K) leading to a shower enters a thinwalled double-pipe counterflow heat exchanger at 15°C at a rate of 1.25 kg/s and is heated to 60°C by hot water (cp = 4190 J/kg·K) that enters at 100°C at a rate of 4 kg/s.

Determine the magnitude of the acceleration for the speeding up phase.

The experimenter fom the video rotates on his stool, this time holding his empty hands in his lap. You stand on a desk above him and drop a long, heavy been bag straight down so that it lands across his lap, in his hands. what happens?