Your age estimate for hadriaca patera is based on the density of craters equal to or larger than 500 meters in size. why did we select that size limit for this image? we asked you to focus on 500 + meter craters because there are enough of them present in a field of this size and this age to give a statistically useful answer. how would your age estimate change if you studied craters down to a limit of 250 meter? calculate a second age estimate based on these craters, and compare it to your first value. do they agree?

To protect all four receptacles on a branch circuit that surrounds a swimming pool, you would install which of the following configurations? a. gfci feed-through receptacle at the end of the load's circuit b. gfci-terminated receptacle at the beginning of the load's circuit c. gfci feed-through receptacle at the beginning of the load's circuit and the other receptacles connected to the load side of that receptacle d. gfci-terminated receptacle at each end of the load's circuit

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

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