Atugboat pulls a small barge through a harbor. the propeller thrust minus the drag produces a net thrust that varies linearly with speed. the combined weight of the tug and barge is 3600 kn. the relationship between force and velocity is plotted below: determine the time required to increase the speed from an initial value v1 = 1.0 m/s to a final value v2 = 2.5 m/s. the time required to increase the speed from an initial value v1 = 1.0 m/s to a final value v2 = 2.5 m/s is s

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?

An electromagnet is a device in which moving electric chargers in a coil of wire create a magnet.whats one advantage of using electromagnetic in devices

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?