1. If a submarine's sonar can measure echo times with a precision of 0.0100 s. a. What is the smallest difference in distances it can detect? (Assume that the submarine is in the ocean, not in
freshwater.) [5]
b. Discuss the limits this time resolution imposes on the ability of the sonar system to detect the size and shape
of the object creating the echo. [2]

The “death throes” of stars are amongst the most complex phenomena in all of astronomy, and the “corpses” of stars amongst the most energetic and exotic objects in existence. beginning at the end of the core helium fusion stage in a star’s life, describe in detail the post-main sequence development of both (a) a 1.0 solar mass star, and (b) a 25.0 solar mass star. in what significant ways do they differ? what role does each of these types of stars play in the "star-gas-star" cycle and the evolution of chemical elements in our galaxy?

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.

Explain what will happen if decomposers were apsent from a forest ecoysystem.