How can a focus on the original cost of a product distort economic decisions?
What will be an ideal response?
The total cost of something does not always depend on the original price because
the object can have residual value.
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A mass 
is connected by a light string that passes over a pulley of mass M to a mass 
sliding on a frictionless horizontal surface as shown in the figure. There is no slippage between the string and the pulley. The pulley has a radius of 25.0 cm and a moment of inertia of 1?2 
If 
is 1.00 kg, m2 is 2.00 kg, and M is 4.00 kg, then what is the tension in the string attached to 
?
A. 6.83 N
B. 7.03 N
C. 7.84 N
D. 8.02 N
E. 8.33 N
A rectangular plate in plane stress is subjected to normal stresses ?x 5 35 MPa, ?y 5 26 MPa, and shear stress ?xy 5 14 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:
(A) 0.8
(B) 1.5
(C) 2.1
(D) 2.9
The dark lines in the Sun's spectrum are due to light that is
A) absorbed by the Sun's atmosphere. B) emitted by the Sun. C) reflected by the Sun. D) none of the above
An astronaut leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. The astronaut's destination is a star system 14.4 light-years away
(One light-year is the distance light travels in one year.) According to the astronaut, how long does the trip take? A) 15.0 y B) 14.4 y C) 22.7 y D) 4.20 y E) 9.34 y