An organ pipe open at both ends has two successive harmonics with frequencies of 210 hz and 240 hz. What is the length of the pipe? the speed of sound is 344 m/s in air.

The system is released from rest with the cable taut, and the homogeneous cylinder does not slip on the rough incline. determine the angular acceleration of the cylinder and the minimum coeffi cient s of friction for which the cylinder will not slip.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

The energy equivalent of the rest mass of an electron is