What causes the waters temperature to increase?
A) Kinetic energy from the water is changed into potential energy
B) Mechanical energy from the moving paddles is changed into thermal energy.
C) Potential energy from the moving paddles is changed into kinetic energy.
D) Thermal energy from the water is changed into mechanical energy.
7 answers
The correct answer is:
B) Mechanical energy from the moving paddles is changed into thermal energy.
As the paddles spin and agitate the water, the mechanical energy generated by the motion of the paddles is transferred to the water, increasing its thermal energy and thus raising its temperature.
The correct answer is:
B) a plant using sunlight to make food.
In this process, known as photosynthesis, plants convert solar energy into chemical energy stored in the form of glucose.
The correct answer is:
A) Some energy was released as heat.
In any energy transformation process, especially in mechanical systems, some energy is often lost as heat due to friction and other inefficiencies. This results in the mechanical energy not being completely converted into kinetic energy, leading to the situation described where the mechanical energy of the gears is greater than the kinetic energy of the flying baseball.
The correct answer is:
B) The mechanical energy used to stretch the rubber band back is changed to elastic potential energy in the rubber band. The elastic potential energy is transferred to kinetic energy as the rubber band flies.
In this scenario, the mechanical energy used to stretch the rubber band is stored as elastic potential energy while it is stretched. Once released, that elastic potential energy is converted into kinetic energy as the rubber band flies through the air.
