On planet x, an object weighs 5.51 n. on planet b where the magnitude of the free-fall acceleration is 1.08 g (where g = 9.8 m/s 2 is the gravitational acceleration on earth), the object weighs 20.81 n. the acceleration of gravity is 9.8 m/s 2 . what is the mass of the object be on earth? answer in units of kg.

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

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.

Aheavy piece of hanging sculpture is suspended by a90-cm-long, 5.0 g steel wire. when the wind blows hard, the wire hums at its fundamental frequency of 80hz. what is the mass of the sculpture?