Consider the elliptical orbit of a comet around the Sun. Where in its orbit is the comet moving the fastest?
A) when it is farthest from the Sun
B) when it is closest to the Sun
C) It is always moving at the same speed.
B
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A heavy weight is supported by two cables that exert tensions of magnitude 
and 
. Which statement is correct?
?
?
A.
= 
.B.
= 
.C.
>.D.
<.E.
The concept of matter waves reflects the observation that particles such as electrons sometimes act like ______________
Fill in the blank(s) with correct word
Increasing the mass m of a mass-and-spring system causes what kind of change on the resonant frequency of the system?
A) The frequency increases. B) The frequency decreases. C) There is no change in the frequency. D) The frequency increases if the ratio k/m is greater than or equal to 1 and decreases if the ratio k/m is less than 1. E) The frequency increases if the ratio k/m is less than or equal to 1 and decreases if the ratio k/m is greater than 1.
Polonium-215 alpha decays with a half life of 1.8 ms
(a) How much is left after 1. second? (b) What is the daughter nucleus?