A team of movers are unloading a truck. One of the movers stays in the truck and places the boxes on a ramp, so they slide down to the other members of the team. One box has a mass of 34.9 kg. The mover places the box on the ramp, which is 24.7° below horizontal. If the coefficient of friction between the box and the ramp is 0.211, how quickly will the box accelerate down the ramp? please explain

Can someone explain to me how to do this problem ?

Time remainin52: 42the chart shows data for a moving object. which conclusion is best supported by the information inthe chart? time (s)velocity (m/s

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.