What frequency is received by the ambulance after reflecting from a wall near the person watching the oncoming ambulance (as in the previous problem). the ambulance is moving at 104 km/h and emitting a steady 821-hz sound from its siren? the speed of sound on this day is 345 m/s.

What type of light does this light bulb produce most (i. e. at what wavelength does the spectrum have maximum intensity)?

Within a pendulum, as potential energy decreases, energy increases. a. heat b. kinetic c. frictional d. gravitational

Consider a double atwood machine constructed as follows: a mass 4m is suspended from a string that passes over a massless pulley on frictionless bearings. the other end of this string supports a second similar pulley, over which passes a second string supporting a mass of 3m at one end and m at the other. using two suitable generalized coordinates, set up the lagrangian and use the lagrange equations to find the acceleration of the mass 4m when the system is released. explain why the top pulley rotates even though it carries equal weights on each side.