Which question would BEST explain why scientists now use Model 2 to describe Earth’s position in the solar system? A. Did new planets form and change the relative position of the sun and Earth?

B. Did the sun’s position change over time in the solar system?

C. Did new evidence change our understanding of the position of the Earth and sun?

D. Did the position of the Earth and sun change over time in the solar system?

Aleaky 10-kg bucket is lifted from the ground to a height of 15 m at a constant speed with a rope that weighs 0.7 kg/m. initially the bucket contains 45 kg of water, but the water leaks at a constant rate and finishes draining just as the bucket reaches the 15-m level. find the work done. (use 9.8 m/s2 for g.) show how to approximate the required work by a riemann sum. (let x be the height in meters above the ground. enter xi* as xi.) lim n → ∞ n (9.8)(45−3 xi) i = 1 δx express the work as an integral. 0 dx evaluate the integral. (round your answer to the nearest integer.) j