A ramp with an ideal mechanical advantage of 10 lifts objects to a height of 2 m. How long is the ramp?

Figure shows a simple cathode-ray tube. a beam of particles, emitted by the cathode, strikes the centre of the screen.a. why the cathode must be heated? b. what is the principal energy change that occurs when the beam strikes the screen? c describe and explain what you would expect if the two deflecting plates g and h were connected to an alternating voltage supply

What force is responsible for making fusion possible in the sun? a- gravitational force b- electromagnetic force c- weak nuclear force d- strong nuclear force

Calculate the equilibrium number of vacancies per cubic meter for copper at 27°c and 1000°c, respectively. assume that the energy for vacancy formation is 0.9 ev/atom; the atomic weight and density (at both 27 and 1000 ° c) for copper are 63.5 g/mol and 8.4 g/cm3, respectively