Janelle stands at the window of a building 6.2 m above ground level. She throws her keys straight out of the window (horizontally) and hopes that her friend Rochelle, who is standing 10.4 m out from the base of the building, will catch them. Ignoring air resistance and using g = 10 m s2 for the acceleration due to gravity, find the speed at which Jamelle needs to throw her keys, correct to decimal place.

An ant is crawling along a straight wire, which we shall call the z axis, from A to B to C to D (which overlaps A), as shown in the figure below. (Figure 1) O is the origin. Suppose you take measurements and find that AB is 44 cm, BC is 20 cm,and AO is 4 cm

how did you get the initial equation for v?

One mole of Gold (Au) atom has a mass of 197 g. We know that the density of gold is 19.30 g/cm3 in room temperature. Using those numbers, answer the following questions: a) What is the mass of a single gold atom in kg? b) Assume that gold atoms sit in a perfect cubic crystal structure. Estimate the distance between two gold atoms in meters.   c) If we have a gold cube of 6 cm on each side, how many atoms can we fit along the edge of each side of the cube?  d) What would be the mass, in kilograms, of the gold cube we discussed in part (c) (measuring 6 cm on each side)?