Afather is pulling his child on a sled in the snow. according to newton’s third law, the force the father exerts on the sled is equal to the force the sled exerts on the father but opposite in direction. how is it possible that the father can pull the child and sled forward?

Which articulations allow for greatest range of motion?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

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.