The Eiffel tower is primarily made of steel with an original height of 321 m. A group of high school students from Texas was visiting Paris during the summer break. In order to increase the height of the tower by an additional 1.2 m, how much higher temperature the steel needs to be raised.

The coefficient of linear expansion of steel is 12 10-6/C. A system absorbed 400 J of heat, during the time the surrounding performed work of 400 J on the system. a) What will be the change in the internal energy of the system? b) Later, the system utilizes all it's internal energy to perform work on the system without losing or gaining any heat. How much work is performed by the system?

Two students are modeling an existing heat engine to improve the theoretical efficiency. One of them proposes to lower the Tc by 20 K while the other student proposed to raise Th by 20 K. Which of these two processes will increase the efficiency?

lower the Tc by 20 K

Both students will improve the efficiency at the same amount

There is nothing can be done to improve the theoretical efficiency of the heat engine

raise the Th by 20 K

The figure below represents the motion of a periodic wave. The Y-axis represents the amount of displacement (in met time in the X-axis (in milliseconds). If the speed of this wave is 702 meter/sec. y (m) What is the wavelength of this wave in the unit of the meter?The figure below represents the motion of a periodic wave. The Y-axis represents the amount of displacement (in meters) time in the X-axis (in milliseconds). If the speed of this wave is 705 m/s. y (m) What is the frequency of this wave in the unit of Hertz?The figure below represents the motion of a periodic wave. The Y-axis represents the amount of displacement time in the X-axis (in milliseconds). If the speed of this wave is 758 m/s. 1 ( my) What is the amplitude of this wave in the unit of meters