Two slits separated by 0.10 mm are illuminated with green light (? = 540 nm). Calculate the distance (in cm) from the central bright-region to the fifth bright band if the screen is 1.0 m away
a. 2.3
b. 2.5
c. 2.7
d. 2.1
e. 2.0
c
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Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what does current evidence suggest?
A) Unlike the broad distribution of dark matter in spiral galaxies, elliptical galaxies probably contain dark matter only near their centers. B) Elliptical galaxies probably contain far more dark matter than spiral galaxies. C) Elliptical galaxies probably contain about the same proportion of their mass in the form of dark matter as do spiral galaxies. D) Elliptical galaxies probably contain far less dark matter than spiral galaxies.
A 30-kg child stands at one end of a floating 20-kg canoe that is 5.0-m long and initially at rest in the water. The child then slowly walks to the other end of the canoe
How far does the canoe move in the water, assuming water friction is negligible? A) 2.0 m B) 5.0 m C) 4.0 m D) 1.0 m E) 3.0 m
The force needed to make an object move in a circle is
a. centripetal force b. weight c. kinetic friction d. static friction e. none of the above
Two devices that make use of a bimetallic strip are a __________ and a __________
Fill in the blank(s) with correct word