If I = 0.40 A in the circuit segment shown below, what is the potential difference Va ? Vb?
a.
31 V
b.
28 V
c.
25 V
d.
34 V
e.
10 V
c
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For a star of 10 solar masses, its main sequence life span will be:
A) ten times longer than our Sun's. B) about the same as the Sun's. C) only a tenth of the Sun's. D) about a hundred times less than the Sun's. E) only 1/1000th of the Sun.
What is the preferred name for Mg3N2?
a. Magnesium trinitride b. Magnesium nitride c. Dimagnesium trinitride d. Manganese nitrate
Fiber optic cable is in the form of a cylinder of fiber with index of refraction 1.67 and cladding around the outside of index of refraction 1.45. What is the maximum angle for light rays inside the fiber with respect to the cable’s axis for which the light will be fully transmitted thanks to total internal reflection?
A. 
B. 
C. 
D. 
The planet Venus requires 225 days to orbit the Sun, which has a mass M = 1.99 × 1030 kg, in an almost circular trajectory. Calculate the radius of the orbit and the orbital speed of Venus as it circles the Sun.
What will be an ideal response?