Tutor profile: Anthony A.
Subject: Physics (Thermodynamics)
Why do fluids generally become less dense as they are heated?
Heating makes the molecules of the fluid move more quickly. When energy (heat) is added to the molecules of a fluid, the molecules become more energetic, moving around more quickly and with more force. More-energetic molecules take up more space, so fewer can fit into the same space, and the fluid becomes less dense,
Subject: Physics (Newtonian Mechanics)
What is the acceleration of a 0.25-kilogram particle subject to a single force of 10 newtons eastward?
Use Newton's second law, F=ma, with the given force and mass values to solve for the particle's acceleration. F=ma 10N=(0.25 kg)a 40 m/s^2=a
You run from your house to the grocery store in 1.0 minute, and the store is 300 meters from your house. What is your average speed in meters per second for the trip?
Average speed is the distance covered divided by the time it takes to cover that distance. In this case, the distance covered is (delta)x=300 meters. In seconds, the time it takes to cover this distance is (delta)t=1.0 min =60 s Your average speed is v= (delta)x/(delta)t= 300m/60s= 5.0m/s
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