A3.00 kg object rests upon a frictionless, horizontal floor. the object is attached to a horizontal spring (of force constant k = 485 n/m) whose other end is anchored to a nearby wall. the object is pulled until it lies a distance xi = 4.85 cm from its equilibrium position (x = 0). the object is then released and undergoes simple harmonic motion.

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

How many atoms of nitrogen are in the chemical formula ni(w on

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.