A 2000-kg ore car rolls 50.0 m down a frictionless 10.0° incline. If there is a horizontal spring at the end of the incline, what spring constant is required to stop the ore car in a distance of 2.00 m?
a. 340 kN/m
c. 1700 kN/m
b. 68.1 kN/m
d. 85.1 kN/m
D
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a. NA/2 b. NA c. 2 NA d. The answer is not given.
What types of observations are necessary to determine the absolute luminosity of a star?
What will be an ideal response?
Answer the following statement(s) true (T) or false (F)
1. Suppose we add a certain amount of energy to a quanton in a box, increasing its energy from 
. Adding the same amount of energy again will increase its energy to 
.
2. Suppose we add a certain amount of energy to a simple quantum harmonic oscillator, increasing its energy
from 
. Adding the same amount of energy again will increase its energy to 
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A) 0.5 m B) 1.5 m C) 2.5 m D) 3.5 m E) 4.5 m