A15 kg weight is attached to a spring with constant k = 60 n/m and subjected to an external force f ( t ) = − 945 sin ( 5 t ) f(t)=-945 sin(5t) . the weight is initially displaced 4 meters above equilibrium and given an upward velocity of 5 m/s. find its displacement for t > 0.

Ahowler monkey is the loudest land animal and, under some circumstances, can be heard up to a distance of 4.6 km. assume the acoustic output of a howler to be uniform in all directions and that the threshold of hearing is 1.0 × 10-12 w/m2. what is the acoustic power emitted by the howler

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_