A maglev train is lifted above the train track by magnetic repulsion when it is moving. Why is that a maglev train can move much faster than a normal train ?

If 1 lb of fat is stored by the body for each 14.6×103kj of excess nutritional energy consumed, how long will it take this person to gain 1 lb?

Which expression allows you to determine the mechanical advantage of an inclined plane? a. height of plane / input force b. length of plane / input force c. length of plane / height of plane d. height of plane / length of plane

Will you chech and finish these for me, because i am stumped with them.