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.
d
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A hoop is rolling without slipping along a horizontal surface with a speed of 5.50 m/s when it starts up a ramp that makes an angle of 25.0° with the horizontal. What is the speed of the hoop after it has rolled 3.00 m up the ramp?
A) 4.22 m/s B) 1.91 m/s C) 2.06 m/s D) 3.79 m/s E) 8.02 m/s
An iron ball and wooden ball of the same size are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater
A) speed. B) acceleration. C) momentum. D) all of the above E) none of the above
How do we know what Earth's temperature was many years before thermometers existed?
A) From computer calculations that start from the conditions (the atmosphere and sea level, primarily) of earlier times and then calculate the resulting temperature. B) From laboratory experiments that reconstruct the conditions (the atmosphere and sea level, primarily) of earlier times and then measure the resulting temperature. C) From such indirect methods as tree rings (the thickness and density of a ring is dependent on the temperature at the time of growth) and annual layers of ice in ice cores. D) From historical information about the climate recorded by Vikings and other travelers during the ice ages. E) From computer calculations that work backward from the present time to calculate the temperature at earlier times.
A certain battery charger uses 12 W of power. At 6.0 cents per kilowatt-hour, how much does it cost to charge batteries for a full day?
A) 28¢ B) 1.4¢ C) 75¢ D) 1.7¢ E) 2.3¢