Unlike electric potential, the electric potential energy is a vector quantity
Indicate whether the statement is true or false
FALSE
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Statistical evidence
a. can be used to draw conclusions about a specific cases. b. is applicable to classes of objects where only a few objects from the class have been studied. c. allows scientists to determine the mechanism that produces the dust ring in Centaurus A. d. allows scientists to deduce general characteristics about a class of objects with similar properties. e. provides insight into the behavior of an individual object based on careful observations of it.
Thermal Expansion: An aluminum rod is 10.0 cm long and a steel rod is 80.0 cm long when both rods are at a temperature of 15°C. Both rods have the same diameter. The rods are now joined end-to-end to form a rod 90.0 cm long. If the temperature is now raised from 15°C to 90°C, what is the increase in the length of the joined rod? The coefficient of linear expansion of aluminum is 2.4 × 10-5 K-1 and that of steel is 1.2 × 10-5 K-1.
A. 0.90 mm B. 0.81 mm C. 0.72 mm D. 0.63 mm E. 0.99 mm
We can see each other in the classroom right now because we
A) emit thermal radiation. B) emit visible light. C) emit infrared light. D) reflect visible light. E) reflect infrared light.
Riding down a river in an old canoe, if the discharge of the river increases a little and the width and the depth of the river stay the same, the speed of the river will
A) decrease. B) increase. C) stay the same. D) become unpredictable.