Звук взрыва снаряда в озере на расстоянии 2,25 км от наблюдателя достигает наблюдателя как через воду, так и через воздух. Звук с воздуха слышен через 5,8 секунды. Рассчитайте скорость звука в воде.

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Which fact supports the conclusion that there will be fewer farm managers in the future? a) a farmer manager’s duties vary by the type of farm. b) farm technology is replacing some administrative jobs c) farm managers often need experience but not education. d) administrative duties include budgeting and training staff.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer