Help me pls I will make the answer the most brainiest thank u A kid is on a stationary sled, on snowy ground with Us=0.105. It takes 71.2N of force to get the sled moving. How much normal force is acting?

Explain vector addition, triangle method and parallelogram method

What is the mass of the same rock on the earth

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.