A(n) ____________ is a description of some natural phenomenon that can't be right or wrong. It is merely a convenient way to think about a natural phenomenon
a. hypothesis
b. paradigm
c. natural law
d. model
e. theory
D
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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.
Two cylinders are in contact along an inclined plane. The upper cylinder (weight is 2.5W) rests against the lower cylinder (weight W), and both are supported by a wall where the contact force is N1. Assume that all friction forces are negligible. An expression for contact force N1 in terms of load variable W is:
(A) 1.75W
(B) 3.5W
(C) 1.57W
(D) 2.01W
Because of its axial tilt and more elliptical orbit, Mars' polar caps change size even more than do the Earth's
Indicate whether the statement is true or false
Three wires, each carry 2 A into in a junction. From that junction emerge two other wires carrying the current away. What could the current in those two wires be?
1.2 A each 2.6 A each 3.3 A each 4.4 A each