Expert Physics Tutoring

Q1 (1 mark):

Define internal energy.

Q2 (2 marks):

Explain the difference between thermal energy and internal energy.

Q3 (3 marks):

Describe how heat transfer can increase the internal energy of a substance.

Q4 (2 marks):

State the law of conservation of energy in relation to internal energy.

Q5 (4 marks):

Calculate the increase in internal energy when 10g of water at 20°C is heated to 80°C. (Specific heat capacity of water = 4.2 J/g°C)

Q6 (3 marks):

Explain the difference between thermal equilibrium and heating.

Q7 (2 marks):

Give an example of a real-world process that involves the transfer of thermal energy by conduction.

Q8 (3 marks):

Describe the process of evaporation and how it affects the internal energy of a liquid.

Q9 (4 marks):

Calculate the work done when a force of 500N is applied to a box to move it 4m across the floor. (Neglect friction)

Q10 (3 marks):

Explain the concept of specific latent heat and its role in energy transfers during phase changes.