4.a 10- kg mass is attached to a spring, stretching it 0.7 m from its natural length. the mass is started in motion from the equilibrium position with an initial velocity of 1 m/s in the downward direction. a. find the equation of motion assuming no air resistance. b.when is the first time the mass goes through the equilibrium position after it was set in motion. c. find the equation of motion assuming air resistance equal to -90x’(t) newtons. d.what is the long term behavior of the motion described in part (c)?

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.

Which of the following statements comparing electron microscopy and light microscopy is false? which of the following statements comparing electron microscopy and light microscopy is false? both the electron microscope and the light microscope use the same wavelengths for illumination. images produced by light microscopes can be in color, whereas electron microscope images are black and white unless they are artificially colored. the electron microscope has greater resolution than the light microscope. electron microscopes can allow examination of viruses and internal cell structures, whereas light microscopes are limited to objects that are 0.5 micrometers and larger. request answer