Ariver flows with a uniform velocity v. a person in a motorboat travels 1.00 km upstream, at which time she passes a log floating by. always with the same throttle setting, the boater continues to travel upstream for an- other 60.0 min and then returns downstream to her starting point, which she reaches just as the same log does. find the velocity of the river. (hint: the time of travel of the boat after it meets the log equals the time of travel of the log.)

1-10. need . physics. circular motion. 35 points

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.

Acid precipitation chemically weathering a 5.0-kg limestone rock . which coukd be the result ?