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Olin [163]
3 years ago
9

Plz help me with this!

Physics
1 answer:
vagabundo [1.1K]3 years ago
7 0
A conductor is something which allows electricity to pass through it
an example is a coin
An insulator is something which cannot allow electricity to pass through it
an example is plastic (or plastic cotton reel, plastic container ect.)
Static electricity is when you rub two things together to create static

I'm not sure if i helped on the last question but i am definitely sure of the first ones
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A steel casting weighing 2 kg has an initial temperature of 500°c; 25 kg of water initially at 25°c is contained in a perfectly
SCORPION-xisa [38]
<span> Plan: Use Q = m · c · ΔT three times. Hot casting cools ΔT_hot = 500°C - Tf. Cold water and steel tank heat ΔT_cold = Tf - 25°C. Set Q from hot casting cooling = Q from cold tank heating.
here
m_cast · c_steel · ΔT_hot = (m_tank · c_steel + m_water · c_water) · ΔT_cold

m_cast · c_steel · (500°C - Tf) = (m_tank · c_steel + m_water · c_water) · (Tf - 25°C)

2.5 kg · 0.50 kJ/(kg K°) · (500°C - Tf) = (5 kg· 0.50 kJ/(kg K°) + 40 kg· 4.18 kJ/(kg K°)) · (Tf - 25°C)

Solve for Tf, remember that K° = C° (i.e. for ΔT's) </span>
3 0
3 years ago
Read 2 more answers
4.6 billion years ago the earth is created from what
Lina20 [59]

I'm not positive but if I'm reading the question right it would be the big bang sorry if I'm wrong

6 0
3 years ago
how much current is in a circuit that includes a 9-volt battery and a bulb with a resistance of 3 ohms?
ExtremeBDS [4]
3 Amper 9 divided by 3
8 0
3 years ago
The electric field between two parallel plates has a magnitude of 875 n/
Marizza181 [45]
The answer:
1.8 x 10^0 V
7 0
3 years ago
A hole is drilled in a metal plate. When the metal is raised to a higher temperature, what happens to the diameter of the hole?
zysi [14]

Answer:

The diameter of the hole increases

Explanation:

Metals expand and contract with temperature. Whenever metal is heated, it usually expands in relation to its thermal expansivity. This expansion leads to a slight increase in surface area.

Once the surface area of the metal changes, this means that the dimensions of the whole metal surface changed. As a result, the diameter of the hole drilled in the metal plate will change also. In our case, the diameter of the hole will increase.

4 0
3 years ago
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