Design technology quick check, check my answers
The heat capacity of a material shows the amount of heat that can be taken in before the material increases in temperature. Which statement about heat capacity is correct?(1 point)
A material with a greater heat capacity will exhibit greater changes in the kinetic energy of its particles due to increases or decreases in heat.
A material with a greater heat capacity will have particles that move apart or come together more easily in response to increases or decreases in heat.
A material with a greater heat capacity will show changes in electrical conductivity due to increases or decreases in heat.
A material with a greater heat capacity is better able to resist changes due to increases or decreases in heat.****
Silver is a better conductor than aluminum. Which statement best explains this difference?(1 point)
Silver allows less electric current to flow through than aluminum.
Silver is better than aluminum at preventing electricity from transferring.
Silver can create a wider pathway for electrons to travel than aluminum.******
Silver holds on to its electrons less tightly than aluminum.
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)
carbon steel
iron
gold
copper*****
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)
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.
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.****
Which material is a composite?(1 point)
polycarbonate****
gold
aluminum
silicon
Please reply asap
The answers are:
1. Polycarbonate
2. They Contract
3. Yes aluminum is a conductor
4. Rubber
5.Copper
I think I would have picked a different answer for the silver question. The choice you picked has merit but I would have picked
"Silver holds on to its electrons less tightly than aluminum."