A standard door into a house rotates about a vertical axis through one side, as defined by the door's hinges. A uniform magnetic
1 answer:
Answer:
The angle that the door must rotate is 70.5 graus
Explanation:
When the door rotates through and angel X, the magnetic flux that passes through the door decreases from its maximum value to 0.3 of its maximum value
This way,
X = 0.3 Xmax
X = B A cosX = 0.3 B A
or
cosX = 0.3
or
X = (0.3) = 70.5
X = 70.5 graus
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Answer:
Heat capacity, Q = 38500 Joules
Explanation:
Given the following data;
Mass = 2 kg
Initial temperature, T1 = 30°C
Final temperature, T2 = 80°C
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To find the quantity of heat required;
Mathematically, heat capacity is given by the formula;
Where;
Q represents the heat capacity or quantity of heat.
M represents the mass of an object.
C represents the specific heat capacity of water.
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dt = T2 - T1
dt = 80 - 30
dt = 50°C
Substituting the values into the formula, we have;
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