Homework Help for Engineering

What is the difference between kinetic energy and chemical energy?

Consider the following statements and mark the statement as you answer which is correct in the context of kinetic energy and potential energy.

1. The kinetic energy of a molecule depends on the temperature while potential energy depends upon the position

2. The kinetic energy of an object is due to its position while potential energy is due to its velocity

3.  Both kinetic and potential energy of an object can be maximum at the same time

4. None of these

If we assume the efficiency as 70 % then what would be the kinetic energy resulted from the 180 kcal of chemical energy?

Which of these is exhibiting kinetic energy?

1. A person sitting on a sofa while watching a cricket match

2. A satellite orbiting a planet

3. A book lying on the table

4. None of these

What are different ways to increase the kinetic energy of a molecule?

Read all the following statements and mark the statement as your answer that best defines the heat capacity of a sample.

1. It is the amount of heat required to raise the temperature of unit mass by 1 ℃

2. It is the amount of heat required to raise the temperature of a substance by 1 ℃.

3. It is the amount of heat required to raise the temperature of a body by 100 ℃.

4. None of these

Consider a substance that heats up quickly. What should be the specific heat capacity of the substance in relation to its heating property?

1. High

2. Low

3. Can’t be predict

4. It has no relation with heating characteristic

Which of the following has the highest specific heat capacity?

1. 10 gram of water

2. 100 gram of copper

3. 1000 gram of gold

4. 1000 gram of brass

Which of the following has the greatest heat capacity?

1. 100 gram of water

2. 100 gram of copper

3. 1000 gram of water

4. 1000 gram of copper

By what physical quantity should the heat capacity of an object be divided to obtain specific heat capacity?

What is the heat capacity of the body? Which of the following factors does it depend?

1. Mass

2. The Material of the body

3. Both mass and material of the body

4. Enthalpy of object

Define all three laws of thermodynamics and establish a correlation between them.

Which physical law underlies the first law of thermodynamics?

1. The law of conservation of energy

2. The law of conservation of mass

3. The law of conservation of momentum

4. None of these

Define the entropy of a system with only a single microstate?

Read the statements given below and determine which of the following statements violates the first law of thermodynamics?

1. It is possible to extract unlimited work from a machine without any source of energy.

2. The energy in a system always remains conserve

3. The entropy of the universe can never decrease

4. None of these