Abuilding superintendent twirls a set of keys in a circle at the end of a cord. if the keys have a centripetal acceleration of 114 m/s2 and the cord has a length of 0.29 m, what is the tangential speed of the keys? answer in units of m/s.

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire