Assume that the North American continent can be represented by a slab of rock 6000 km on a side and 35 km deep and that the rock
has an average mass density of 2790 kg/m3
.
The continent is moving at the rate of about
1.2 cm/year.
What is the mass of the continent?

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

Which basic property determines a colored light's placement on the spectrum of visible light? a. speed b. frequency c. amplitude d. velocity

Wind and moving water provide energy. question 1 options: chemical mechanical thermal none of the above