Um trem de 100 metros de comprimento atravessa uma ponte de 150 metros. O trem viaja com uma velocidade de 90 km/h. Quanto tempo o trem leva para atravessar a ponte?

Which would not reduce the amount of green house gasses in the air

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.)

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?