A measurement of an electron's speed is 2.0 × 106 m/s and has an uncertainty of 10%. What is the minimum uncertainty in its position? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 0.91 nm
B) 1.8 nm
C) 2.7 nm
D) 2.8 nm
E) 5.0 nm
Answer: B
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When an item has been launched into orbit:
a. it no longer falls because the weakening of Earth's gravity with increased height has made it lighter than air. b. it no longer falls because it is outside the atmosphere. c. it is kept in orbit by attraction to the Sun and Moon. d. it continues to fall but its path never reaches the ground. e. centripetal force from Earth's gravity keeps it from being accelerated toward Earth.
what are the products of helium burning in a star?
What will be an ideal response?
Venus is visible to us:
a) only during its new phase. b) only near sunrise or sunset. c) only in the summer. d) only in the winter. e) only during the several hours around midnight.
A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation x(x, t) = 2.10 cm cos(2000 rad/s t + 40.0 
x). What is the velocity of the wave?
A. 500 m/s in the + x direction B. 500 m/s in the - x direction C. 200 m/s in the + x direction D. 200 m/s in the - x direction