a machine raises load of 600N using an effort of 200N. if the velocity ratio of the machine is 4 the efficiency of the machine is; a.80 percent b .75 percent c.133and a half percent d.300 percent​

What is the fate of the electrons that interact with a specimen in an electron microscope?

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.