Kara built a model of how molecules behave when they are in solid form. she filled a clear plastic box with marbles to the very top and put the lid on the box. when she shakes the box, the marbles can barely move. which of the following is a limitation of kara's model?

What is the frequency of a light wave with a wavelength of 620nm

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.