NEED ASAP: A crate is placed on a ramp that has a 30-degree incline. If the crate is 45 kg, and if the coefficient of static friction is 0.35, will the crate slide down the ramp or stick in place? If so, what will the net force in the x-direction be? (PLEASE SHOW WORK)

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.

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?