Askier with a mass of 50 kg starts from the top of a hill (at rest) at height h above ground. the skier glides down the hill to point a where her velocity is va = 20 m/s and continues up a second hill 8 meters high and back down the other side. her entire trip up to point c is frictionless. at point c she begins stopping and comes to a complete stop 48 meters later at point d. frictionless gliding frictionless gliding va 20 m/s stopping 43 mi.) what is the height h of the first hill? a. h = 12.8 mb. h = 32.5 mc. h = 16.5 md. h = 28.6 me. h = 20.4 mii.) what is the speed of the skier at point b? a. 0 m/sb. 12.8 m/sc. 15.6 m/sd. 18.3 m/se. 20 m/siii) what is the speed of the skier at point c? a. 0 m/sb. 12.8 m/sc. 15.6 m/sd. 18.3 m/se. 20 m/s

An isolated conducting spherical shell carries a positive charge. part a which statement (or statements) about the electric field and the electric potential inside and outside the spherical shell is correct? which statement (or statements) about the electric field and the electric potential inside and outside the spherical shell is correct? electric potential inside the shell is constant and outside the shell is changing as 1/r2 both the electric potential and the electric field does change with r inside and outside the spherical shell electric potential inside and outside the shell is constant, but not zero electric potential inside the shell is constant and outside the shell is equal to zero electric field inside and outside the shell is constant (does not change with the position r), but is not equal to zero electric field inside and outside the shell is changing as 1/r (where r is the distance from the center of the sphere) electric field inside is equal to zero and outside the shell is constant, but not zero electric potential inside the shell is constant and outside the shell is changing as 1/r electric field inside and outside the shell is changing as 1/r2 electric field inside is equal to zero and outside the shell is changing as 1/r2 electric field inside and outside the shell is zero electric field inside is constant and outside the shell is changing as 1/r

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.)

Convection currents are caused by differences in what two things?