A crate with a mass of m = 130 kg rests on the horizontal deck of a ship. The coefficient of static friction between the crate and the deck is As-0.86. The coefficient of kinetic friction is μk-0.41. Randomized Variables m 130 kg μ,-0.86 Pk=0.41 25% Part (a) Write an expression for the minimum force, F, n, that must be applied to get the block moving from rest. Grade Summary Deductions Potential 0% 100% Submissions Attempts remaining:5 (5% per attempt) detailed view 0 Submit Part (b) What is the magnitude of the force F, n in newtons? Part (c) Write an expression for the force F, that must be applied to keep the block moving at a constant velocity Part (d) what is the magnitude of the force F., in newtons?

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

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.