Ahockey puck is set in motion across a frozen pond. if ice friction and air resistance are neglected, the forced required to keep the puck sliding at constant velocity isa. equal to the weight of the puckb. the weight of the puck divided by the mass of the puckc. the mass of the puck multiplied by 9.8 m/sd. zero newtons

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?

This is the substance(s) formed in a chemical reaction.

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?