Physics students study a piano being pulled across a room on a rug. They know that when it is at rest, it
experiences a gravitational force of 2200 N. When it is
being pulled with 1200 N it is sliding across the room in
equilibrium, but the students feel like they had to pull
harder than 1200 N at first to begin motion.

Stion 13 of 20 : select the best answer for the question. 13. if a certain mass of mercury has a volume of 0.002 m3 at a temperature of 20°c, what will be the volume at 50°c? a. 0.002021624 m3 b. 0.004021624 m3 c. 0.000010812 m3 d. 0.002010812 m3

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

Ineed this now one scientist feels that the changes in global climatic patterns may be good for the health of the biosphere. another scientist feels that sharp changes in climatic patterns could result in the extinction of the biosphere. which of these is the most likely reason the two scientists gave conflicting opinions on the impact of changes in the global climatic pattern? they do not have enough knowledge on the topic. they did not discuss the issue among themselves. they believe conflicting opinion strengthens science. they study different areas of science and have different scientific focuses.