a 75,600 n spacecraft comes in for a vertical landing. from an initial speed of 1 km/s, it comes to rest in 2 minutes with uniform acceleration.
ignoring the air resistance, what braking force must its rockets provide?
1.4 x 103n
1.4 x 10°n
1.4 x 102n
1.4 x 105n

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Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

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.