Which of the following would be considered a pull factor?
a. the lack of financial opportunities in one's home country
b. political oppression in one's home country
c. overpopulation in another country
d. religious freedom in another country

Which type of microscope would allow the viewer to see ribosomes inside a cell?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.