Which type of mechanical wave needs a source of energy to produce it?

a. a transverse wave

b. a longitudinal wave

c. a surface wave

d. all of the above

Should commercial buildings be required to use alternative fuel sources to fulfill a minimum of 25% of their energy needs?

What is the relationship between education, productivity, and wages

Which two living things are most closely related: a) moth and bird b) clam and fish

An inductor is connected to an AC power supply having a maximum output voltage of 3.00 V at a frequency of 280 Hz. What inductance is needed to keep the rms current less than 2.50 mA? (Provide the minimum value.)

How much rope would need to be pulled through a pulley with a mechanical advantage of 2 to lift a load 4 ft?

An LC circuit has a 6.00 mH inductor. The current has its maximum value of 0.570 A at t = 0s. A short time later the capacitor reaches its maximum potential difference of 66.0 V. What is the value of the capacitance?

The first law of thermodynamics states that ΔE = Q - W. Is this also a statement of the principle of conservation of energy? Yes, the heat added and the change in internal energy of the gas equal the work done by the piston.

How can we calculate the density of a sustance that has irregular volume

A two stage rocket leaves its launch pad moving vertically with an average acceleration of 4 m/s2. at 10 s after launch the first stage of the rocket (now without fuel) is released.

A liquid filled sealed system has cylinders with movable pistons on each end. The face of one piston has an area of 5 cm². The other piston has an area of 500 cm² and is supporting a weight of 2 kN on it.