A 10cm tall object is placed perpendicular to the principal axis of a convex lens of focal length
30cm. The distance of the object from the line is
20cm. find the i)position ii)nature and iii) size of
the image formed.

Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon

Explain why electric current cannot exist if a current doesn't have a voltage source.

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