Briefly describe how the solar wind affects magnetospheres and how auroras are produced
What will be an ideal response?
Some particles from the solar wind get channeled toward the poles; most of these particles collide with atoms and molecules in the atmosphere, causing them to create beautiful, often colorful auroras near the poles.
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A modern version of Joule's experiment has you turn a crank attached to an 85.0 g aluminum cylinder. A belt exerts a frictional torque on the cylinder of 1.50 Nm. The specific heat of aluminum is 900 J/(kg•K)
How many turns of the crank are necessary to raise the temperature of the aluminum by 40 C°? A) 325 B) 650 C) 900 D) 975 E) 1300
A steel pipe (d3 5 104 mm, d2 5 96 mm) has a plastic liner with inner diameter d1 5 82 mm. The modulus of elasticity of the steel is 75 times that of the modulus of the plastic. Allowable stresses in steel and plastic are 40 MPa and 550 kPa, respectively. The allowable bending moment for the composite pipe is approximately:
(A) 1100 N?m
(B) 1230 N?m
(C) 1370 N?m
(D) 1460 N?m
In a problem using energy considerations to solve for the speed of a ball thrown from the top of a building when it strikes the ground below, where should the potential energy have its zero value?
a. It should be at the level from where the ball is thrown. b. It should be at the ground level where the ball hits. c. It should be slightly below ground level so the potential energy is always positive. d. It doesn't matter since only differences in potential energy matter in solutions.
Archimedes' principle applies to
A) liquids. B) gases. C) fluids. D) all of the above