Thermal energy depends on an object’s
2 answers:
Answer : Thermal energy depends on the mass, the phase and the temperature of the object.
Explanation :
Thermal energy is defined as the energy that is produced due to heat flow.
Mathematically, it can be written as :
Where
Q is the thermal energy or the heat absorbed/released
c is the specific heat capacity. It varies for solid, liquid and gases.
is the change in temperature
It is clear that the thermal energy depends on the object's mass, temperature and also on the phase.
Hence, the correct option is (d).
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Answer:
C) 7.35*10⁶ N/C radially outward
Explanation:
- If we apply the Gauss'law, to a spherical gaussian surface with radius r=7 cm, due to the symmetry, the electric field must be normal to the surface, and equal at all points along it.
- So, we can write the following equation:
- As the electric field must be zero inside the conducting spherical shell, this means that the charge enclosed by a spherical gaussian surface of a radius between 4 and 5 cm, must be zero too.
- So, the +8 μC charge of the solid conducting sphere of radius 2cm, must be compensated by an equal and opposite charge on the inner surface of the conducting shell of total charge -4 μC.
- So, on the outer surface of the shell there must be a charge that be the difference between them:
- Replacing in (1) A = 4*π*ε₀, and Qenc = +4 μC, we can find the value of E, as follows:
- As the charge that produces this electric field is positive, and the electric field has the same direction as the one taken by a positive test charge under the influence of this field, the direction of the field is radially outward, away from the positive charge.