Which material is a composite?(1 point)
Responses
polycarbonate
polycarbonate
gold
gold
aluminum
aluminum
silicon
What happens to some metals when the kinetic energy of their particles is decreased?(1 point)
Responses
They melt.
They melt.
They conduct.
They conduct.
They expand.
They expand.
They contract.
9 answers
They contract.
Which material is a composite?(1 point)
Responses
polycarbonate
polycarbonate
gold
gold
aluminum
aluminum
silicon
Responses
polycarbonate
polycarbonate
gold
gold
aluminum
aluminum
silicon
polycarbonate
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?(1 point)
Responses
No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
Yes, it would. The glass would carry the current, while aluminum is an insulator.
Yes, it would. The glass would carry the current, while aluminum is an insulator.
Yes, it would. Aluminum is a conductor, and the glass would prevent electricity from transferring to a person holding the device.
Yes, it would. Aluminum is a conductor, and the glass would prevent electricity from transferring to a person holding the device.
No, it would not. Both aluminum and glass are conductors, so the current would be exposed to outside elements.
Responses
No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
Yes, it would. The glass would carry the current, while aluminum is an insulator.
Yes, it would. The glass would carry the current, while aluminum is an insulator.
Yes, it would. Aluminum is a conductor, and the glass would prevent electricity from transferring to a person holding the device.
Yes, it would. Aluminum is a conductor, and the glass would prevent electricity from transferring to a person holding the device.
No, it would not. Both aluminum and glass are conductors, so the current would be exposed to outside elements.
No, it would not. Both aluminum and glass are insulators, so the device would not carry a current.
Which material would be a suitable insulator?(1 point)
Responses
gold
gold
rubber
rubber
copper
copper
silver
silver
Responses
gold
gold
rubber
rubber
copper
copper
silver
silver
rubber
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?
(1 point)
Responses
iron
iron
carbon steel
carbon steel
copper
copper
gold
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?
(1 point)
Responses
iron
iron
carbon steel
carbon steel
copper
copper
gold
Copper