Which wave source can travel through the vacuum of space?
a. lasers
b. sound waves
c. pressure waves
d. high frequency whistles

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.