In 1851 Jean Bernard Leon Foucault demonstrated the rotation of the Earth using a pendulum 11.0 m long, which was set up in the Paris Observatory. What was the period of oscillation of the pendulum?
A) 6.65 s
B) 5.63 s
C) 1.79 s
D) 2.12 s
E) 2.58 s
A
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Radioactive Decay: Time (days)026111930Counts per Minute1000899726556356200In a laboratory accident, a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and obtain the data shown in the table. The accident occurred at time t = 0 days. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 16 counts per minute. Of the choices listed, which one is the earliest time after the accident that workers could safely return?
A. 77 days B. 90 days C. 102 days D. 65 days E. 48 days
The weight of a 1.00 kg on the surface of the moon is 
R of the moon is 
m, mass of the moon is 
A. 9.80 N. B. 7.59 N. C. 1.62 N. D. 0.981 N. E. 0.548 N.
How would you describe the distribution of galaxies in your Local Group?
A.) They just look randomly distributed. B.) There are the two big galaxies, and then the dwarfs seem to be clustered around them. C.) The big galaxies are together at the center and the dwarfs are in a big circle around them. D.) The dwarfs are in the center clustered together and the two big galaxies are off to the side. E.) The two larger galaxies are on one side of the group and all the dwarfs are on the other side.
A string of length 2.5 m is fixed at both ends. When the string vibrates at a frequency of 85 Hz, a standing wave with five loops is formed
(a) Determine the distance between two adjacent nodes. (b) Determine the wavelength of the waves that travel on the string. (c) Determine the speed of traveling waves on this string. (d) Determine the fundamental frequency of this string.