A 2800-lb passenger car was originally traveling on a straight section when it gets into a section of the road with a horizontal curve of 750 ft. If the vehicle was originally travelling at 65 mph, a) determine the additional horsepower the vehicle must produce in order to maintain the original speed; b) determine the total resistance on the vehicle as it traverses the horizontal curve. The frontal cross section of the vehicle is 18.5 sq ft with a drag coefficient of 0.39.

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.