Light enters a substance from air at 30.0° to the normal. It continues within the substance at 23.0° to the normal. What is the critical angle for this substance when it is surrounded by air?
A) 53°
B) 51.4°
C) 36.7°
D) 12.6°
B
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The most disorderly arrangement of energy within matter is also
A) the least probable state of matter. B) the most probable state of matter. C) a matter of certainties, not probabilities. D) none of the above
A 0.75-kg sphere is released from rest and is moving 5.0 m/s after falling 2.0 m in a viscous medium. What is the change in mechanical energy caused by the force the viscous medium exerts on the sphere during this descent?
a. -6.1 J b. -4.6 J c. -5.3 J d. -6.8 J e. -2.7 J
As energy is transferred among organisms, some escapes from the environment as ____ energy
a. electrical b. heat c. light d. mechanical e. nuclear
When air gains speed in sweeping across a rooftop its internal pressure is
A) reduced. B) unaffected. C) increased.