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# An object of mass m is attached to a horizontal spring, stretched to a displacement a from equilibrium and released, undergoing harmonic oscillations on a frictionless surface with period t0. the experiment is then repeated with a mass of 4m. the subsequent total mechanical energy of the object with mass 4m is which of the following when compared to the original total mechanical energy? a. greater thanb. less thanc. equal to   ### Another question on Physics Physics, 02.02.2019 06:26
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. Physics, 01.02.2019 20:00
Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground. Physics, 30.01.2019 16:40
A1000-kg car is moving at 30 m/s around a horizontal unbanked curve whose diameter is 0.20 km. what is the magnitude of the friction force required to keep the car from sliding? Physics, 29.01.2019 21:57
Which of the following forces require physical contact? tension air resistance friction magnetic force applied force
An object of mass m is attached to a horizontal spring, stretched to a displacement a from equilibri...
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