What is the wave speed of a wave that has a frequency of 100 Hz and a wavelength of 0.30 m?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

Which best describes the difference between internal and thermal energy?