Adock worker loading crates on a ship finds that a 27 kg crate, initially at rest on a horizontal surface, requires a 80 n horizontal force to set it in motion. however, after the crate is in motion, a horizontal force of 56 n is required to keep it moving with a constant speed. the acceleration of gravity is 9.8 m/s 2 . find the coefficient of static friction between crate and floor.

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

Find the dimensions and area of the largest rectangle that can be inscribed in the upper half of the ellipse. (give your answers in terms of a and b. enter the dimensions as a comma-separated list.)

What is the coefficient of kinetic friction μk between the block and the tabletop?