Shell Radius: Using the Bohr model, what is the radius of the lowest-energy electron orbit in a singly-ionized He atom, which has 2 protons? (r1 = 0.0529 nm for hydrogen)
Fill in the blank(s) with the appropriate word(s).
0.0265 nm
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Power: The power rating of a 400-? resistor is 0.25 W. What is the maximum voltage you can safely connect across its ends?
A. 10 V B. 20 V C. 30 V D. 40 V E. 50 V
A spaceship whizzes past a planet at high speed. An observer on the planet sees a contracted spaceship, while an observer on the spaceship sees
A) a contracted planet. B) an expanded planet. C) a normal planet. D) a contracted or expanded planet depending on the direction of travel.
A car starts from rest and travels a distance of 100 m in 20 seconds with a constant acceleration. The velocity of the car is at the end of the 20 second interval is
A. 25 m/s. B. 20 m/s. C. 15 m/s. D. 10 m/s. E. 5.0 m/s.
What type of eruption does a cinder cone volcano have?
What will be an ideal response?