The Bohr model of the hydrogen atom accounts for which quantum number?
a. principal
b. orbital
c. orbital magnetic
d. All of the above.
a
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A 3.0-kg mass is released from rest at point A of a circular frictionless track of radius 0.40 m as shown in the figure. The mass slides down the track and collides with a 1.4-kg mass that is initially at rest on a horizontal frictionless surface. If the masses stick together, what is their speed after the collision?
A. 2.1 m/s B. 1.7 m/s C. 1.9 m/s D. 1.5 m/s E. 2.3 m/s
What are gravitational waves?
A) a type of energy that is different from light and that has been detected from sources such as merging neutron stars and black holes B) a form of light with higher energy than gamma rays C) a form of light with lower energy than radio waves D) the name we give to electromagnetic waves that come from astronomical objects that have gravity
The coefficient of linear expansion of lead is 29 × 10-6 K-1. What change in temperature will cause a 10-m long lead bar to change in length by 3.0 mm?
A) 5.0 K B) 10 K C) 15 K D) 20 K E) 25 K
Three 7.0-? resistors are connected in series. What is their equivalent resistance?
a. 21 ? b. 7.0 ? c. 16 ? d. 2.3 ? e. 10 ?