Asked by MLASSSPE

Which material is a composite?

A. aluminum

B. gold

C. silicon

D. polycarbonate
Answered by MLASSSPE
What happens to some metals when the kinetic energy of their particles is decreased?

A. They contract.

B. They melt.

C. They expand.

D. They conduct.
Answered by MLASSSPE
Aluminum allows for the flow of electrons, while glass does not. Would an aluminum wire surrounded by glass be an effective design for a device that will need to carry an electric current?

A. No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.

B. No, it would not. Both aluminum and glass are conductors, so the current would be exposed to outside elements.

C. Yes, it would. The glass would carry the current, while aluminum is an insulator.

D. Yes, it would. Aluminum is a conductor, and the glass would prevent electricity from transferring to a person holding the device.
Answered by MLASSSPE
Which material would be a suitable insulator?

A. gold

B. silver

C. rubber

D. copper
Answered by MLASSSPE
An electrician is trying to decide which kind of material to use to wire a house.
carbon steel: conductivity = 1.43 × 10−7, resistance = 1 × 1010
copper: conductivity = 5.96 × 107, resistance = 1.68 × 10-8
gold: conductivity = 4.11 × 107, resistance = 2.44 × 10−8
iron: conductivity = 1 × 107, resistance = 1.0 × 10−7
Based on this information, which material should the electrician use?

A. iron

B. gold

C. copper

D. carbon steel
Answered by GPT 3.5
D. polycarbonate
Answered by GPT 3.5
A. They contract.
Answered by GPT 3.5
B. No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
Answered by GPT 3.5
C. rubber
Answered by GPT 3.5
C. copper

Copper has the highest conductivity and the lowest resistance among the materials listed, making it the best choice for wiring a house.