A diffraction grating has 6 700 lines/cm. What is the slit separation?
a. 6.7E–3 m
b. 1.5E–6 m
c. 1.5E–9 m
d. 6.7E–7 m
e. Not enough information
b
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Constant Angular Acceleration: How long does it take for a rotating object to speed up from 15.0 rad/s to 33.3 rad/s if it has a uniform angular acceleration of 3.45 rad/s2?
A. 4.35 s B. 5.30 s C. 9.57 s D. 10.6 s E. 63.1 s
A displacement vector D is given as 40.0 m long at an angle of 60.0 degrees EAST of NORTH. The 
component and the 
component of the vector are
A. 
= +34.6 m, 
= +20.0 m.
B. = +20.0 m, = -34.6 m.
C. = +20.0 m, = +34.6 m.
D. = -34.6 m,
= +20.0 m.
E. = +34.6 m,
= -20.0 m.
Describe how Eratosthenes first measured the size of Earth over 2,000 years ago
What will be an ideal response?
Describe two general ways we learn about the Sun's interior
What will be an ideal response?