A58.1 kg wood board is resting on very smooth ice in the middle of a frozen lake. a 48.3 kg boy stands at one end of the board. he walks from one end of the board to the other end with a velocity of 1.69 m/s relative to the ice in the positive direction. what is the velocity of the board relative to the ice? -1.69m/s

Explain the doppler effect in terms of frequency, wavelength, and speed.

What are igneous intrusions and extrusions

An engine undergoes a cycle as shown in the diagram. during a complete cycle the work done by the gas is 28.5×103 j and the energy transferred thermally out is 99.4×103 j. there are 1.5×1024 gas molecules and they have three active degrees of freedom. 6. (6 pts) during which process(es) is energy transferred thermally into the gas? a. 1→2 b. 2→3 c. 4→1 d. 1→2 and 4→1 e. none of the above