Reconditioning valves is being discussed. Technician A says the valve is stroked across the stone at the same time it is fed in. Technician B says when the last pass is complete, back the valve out of the stone. Who is correct?

How much current is in a circuit that includes a 9 - volt battery and a bulb with a resistance of 12 ohms?

Light can travel through materials that you can't see through like aluminum foil. True or false. Explain with evidence

What is heat? Be sure.

An unknown material has a mass of 0.447 kg, and its temperature increases by 2.87°C when 943 J of heat are added. What is the specific heat of the material? (Unit=J (kg*C))

What were the patterns that people saw in the sky long ago?

Three resistors, R1 = 10 Ω, R2 = 20 Ω and R3 = 30 Ω are connected in series to a 12 V battery. Find: a. The equivalent resistance of the circuit. b. The current in each resistor. c. The voltage across each resistor. d.

What are the basic rules of basketball? Are the rules different for men's versus women's competition?

A note is being played on a string on a guitar. The string is then pushed to the side while still in contact with the same fret. What happens to the frequency of the note then played compared to the original note?

What would you predict about a chemical that has a hydrogen ion concentration of 1 * 10-12 M? It will form salt and water when added to a base. It contains no hydroxide ions. It has high concentration of hydroxide ions. It has a sour taste.

What are the three theories of light?