A 2.00-m-long 6.00-kg ladder pivoted at the top hangs down from a platform at the circus. A 42.0-kg trapeze artist climbs to a point where her center of mass is at the center of the ladder and swings at the system's natural frequency. The angular frequency (in s1) of the system of ladder and woman is
a. 1.01.
b. 3.07.
c. 4.03.
d. 8.05.
e. 16.2.
Question 2
Suppose it were possible to drill a frictionless cylindrical channel along a diameter of the Earth from one side of the Earth to another. A body dropped into such a channel will only feel the gravitational pull of mass within a sphere of radius equal to the distance of the mass from the center of the Earth. The density of the Earth is 5.52 103 kg/m3 and G = 6.67 1011 N/m2/kg2 . The mass will oscillate with a period of
a. 84.4 min.
b. 169 min.
c. 24.0 h.
d. 1 130 h.
e. 27.2 d.
Local and long–distance cell communication in animals.
Local/long distance cell Signaling
Long-wattled Umbrellabird
Hormones acting through the brain help regulate metabolism and short- and long-term appetite.
Brush off front to finish. Long brushing strokes from head to feet to finish.
Long division of polynomials