A simple pendulum has a length of 0.80 m and a bob of mass 0.20 kg. It is initially displaced to an angle of 18° from the vertical and released from rest. At t = 1.2 s:
(a) what angle does it make with the vertical?
(b) what is its velocity?
(a) 8.8°
(b) 0.96 m/s
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The Chandrasekhar mass limit is
A) .08 solar masses. B) .4 solar masses. C) 1.4 solar masses. D) 3 solar masses. E) 8 solar masses.
A 2 000-kg sailboat experiences an eastward force of 4 500 N by the ocean tide and a wind force against its sails with magnitude of 1 500 N directed toward the northwest (45° N of W). What is the direction of the resultant acceleration?
a. 27° N of W b. 58° N of W c. 27° N of E d. 17° N of W e. 17° N of E
Where is most of the water on Mars believed to be?
What will be an ideal response?
What is the equivalent resistance between points A and B in the figure when R = 10 ??
a.
20 ?
b.
10 ?
c.
25 ?
d.
15 ?
e.
3.2 ?