A car is moving South at a constant speed of 60 miles per hour. The force of the car's engine is 1200 N South. The force of friction is 450 Newtons North. What is the
net force?

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?

4.4 cm3 of water is boiled at atmospheric pressure to become 1972.7 cm3 of steam, also at atmospheric pressure. calculate the work done by the gas during this process. the latent heat of vaporization of water is 2.26 × 106 j/kg . answer in units of j.