Which one has the smallest range of possibilities [or quantum uncertainty range]?
A) water molecule
B) dust grain
C) proton
D) helium atom
E) electron
B
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Satellites in low-Earth orbits are more likely to crash to Earth when the sunspot cycle is near solar maximum because ________
A) of increased magnetic interference B) it is too dangerous to send the Space Shuttle to service satellites during solar maximum C) they are more likely to have their electronics "fried" by a solar flare during solar maximum D) Earth's upper atmosphere tends to expand during solar maximum, exerting drag on satellites in low orbits
When the principal quantum number is n = 5, how many different values of ? are possible?
1.1 2.5 3.9 4.25
An automobile travels due north with a constant speed of 76 km/h. All forces considered, the unbalanced force acting on the auto is
a. zero. b. southward. c. northward. d. downward. e. upward.
Two experiments are performed. In (A), an 18.0-N force pushes horizontally on a 2.00-kg block that then pushes on a 4.00-kg block. In (B), an 18.0-N force pushes on a 4.00-kg block that then pushes on a 2.00-kg block. Which statement is correct?
a. The acceleration is 3.00 m/s2 in both (A) and (B). b. The acceleration is 4.50 m/s2 in both (A) and (B). c. The acceleration is 6.00 m/s2 in both (A) and (B). d. The acceleration is 9.00 m/s2 in both (A) and (B). e. The 2.00-kg block has a 9.00 m/s2 acceleration. The 4.00-kg block has a 4.50 m/s2 acceleration.