Una avioneta para aplicar agroquímicos debe alcanzar una velocidad de 28 m/s para poder despegar. Si el motor provee una aceleración efectiva de despegue de 1.5 m/s2, determine: La longitud efectiva mínima que debe tener la pista para que la avioneta pueda despegar, si en la carrera de despegue recorre la pista partiendo del reposo, desde un extremo de la misma. El tiempo que le toma despegar bajo las condiciones del inciso anterior.

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Could someone me find the answer to this problem.

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?