The length of a football field is closest to
(1) 1000 cm (3) 1000 km
(2) 1000 dm (4) 1000 mm

Observations show that interstellar clouds can have almost any shape and

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little

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