Science works efficiently by
a. testing models and keeping only those that work.
b. stating facts that need to be memorized.
c. rewarding those who prove things about how Nature works.
d. asking for answers to all pressing human problems.
e. valuing all models no matter what happens in experiments.
A
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A car is traveling north at 1.77m/s. After 12 s its velocity is in the same direction. Find the magnitude and direction of the car's average acceleration
A) 0.30 m/s2, south B) 2.7 m/s2, south C) 0.30 m/s2, north D) 2.7 m/s2, north
A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 24 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the opposite direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
a. 0.82 mT b. 0.93 mT c. 0.70 mT d. 0.58 mT e. 0.40 mT
In a diagram of electric field lines, what is represented by lines that are drawn closer together?
A. a more positive field B. a more negative field C. a stronger field D. a weaker field E. nothing (artistic license)
What would happen to Earth if we somehow moved our planet to the orbit of Venus?
A) Earth would suffer a runaway greenhouse effect and become as hot as or hotter than Venus. B) Temperatures would rise only slightly, but enough to melt the polar caps. C) The fact that we have oceans would moderate the temperature change because of moving our planet, so temperature would hardly change at all. D) Being so much closer to the Sun would almost immediately cause the surface of Earth to melt, and all our cities would then be destroyed by the hot lava.