Aforce in the +x-direction with magnitude f(x)=18.0n−(0.530n/m)x is applied to a 8.40 kg box that is sitting on the horizontal, frictionless surface of a frozen lake. f(x) is the only horizontal force on the box. so, if the box is initially at rest at x=0, what is its speed after it has traveled 16.0 m? express your answer to three significant figures and include the appropriate units.

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

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.

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?