A typical commercial speaker has an impedance of 8Ω. If this impedance is mostly provided by its inductance, the inductance is about 3 × 10−4H. Nathan, Kelly, and Josh wanted to use an entire spool of wire to make their speaker in lab. The coil was about 5cm long, had a radius of about 3cm and contained 1000 turns of wire. Calculate the inductance of the coil of wire approximating it as an infinite solenoid.

(a) L = 0.0036H. (b) L = 0.071H. (c) L = 0.33H. (d) L = 2.4H. (e) L = 4.7H

Which fators influence ocean currents

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.