The answer is 1.88·10^-3 mg.
Answer:
No.
Explanation:
No, convection does not occur if Earth's mantle were a box 30 km on a side because convection needs medium for the movement of heat energy from one place to another. Convection and conduction are two processes which needs medium for its movement while radiation does not need any medium for its movement. If there is a empty space present between two substances so convection does not occur.
Answer:
The mass of copper that was heated is 30 g
Explanation:
The formula for the heat supplied, ΔH is;
ΔH = m·c·Δt
Where:
ΔH = Heat supplied = 480 J
m = Mass of the copper sample = Required
c = Specific heat capacity of copper = 0.4 J/(g·°C)
Δt = Change in temperature = T₂ - T₁ = 60° - 20° = 40°C
T₁ = Initial temperature = 20°C
T₂ = Final temperature = 60°C
Therefore, plugging the values, we have;
480 = m×0.4×40
m = 480/(0.4 × 40) = 30 g
The mass of copper that was heated = 30 g.
