While sitting in your car by the side of a country road, you see your friend, who happens to have an identical car with an identical horn, approaching you. you blow your horn, which has a frequency of 260 hz; your friend begins to blow his horn as well, and you hear a beat frequency of 6.0hz .

how fast is your friend approaching you?

express your answer to two significant figures and include the appropriate units.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.