Ablock with mass m =6.4 kg is hung from a vertical spring. when the mass hangs in equilibrium, the spring stretches x = 0.28 m. while at this equilibrium position, the mass is then given an initial push downward at v = 5.1 m/s. the block oscillates on the spring without friction.
1)what is the spring constant of the spring?
2)what is the oscillation frequency?
3)after t = 0.42 s what is the speed of the block?
4)what is the magnitude of the maximum acceleration of the block?
5)at t = 0.42 s what is the magnitude of the net force on the block?

The 20@kg wheel has a radius of gyration about its center g of kg = 300 mm. when it is subjected to a couple moment of m = 50 n # m, it rolls without slipping. determine the angular velocity of the wheel after its mass center g has traveled through a distance of sg = 20 m, starting from rest.

True or false: the revolution of the earth creates day and night as it rotates around the sun

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.