An object attached to an ideal spring oscillates with an angular frequency of 2.81 rad/s. the object has a maximum displacement at t = 0.00 s of 0.232 m. if the force constant (spring constant is 29.8 n/m, what is the potential energy stored in the mass-spring system when t = 1.42 s?

Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.