A 64 lb weight is attached to a spring with constant k D 8 lb/ft and subjected to an external force F .t / D 2 sin t. The weight is initially displaced 6 inches above equilibrium and given an upward velocity of 2 ft/s. Find its displacement for t > 0

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?