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 s?1) of the system of ladder and woman is
a. 1.01.
b. 3.07.
c. 4.03.
d. 8.05.
e. 16.2.
b
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Which of the 4 fundamental forces binds the nucleus together, and which binds the atom [the electron orbits] together?
A) Strong nuclear force binds the nucleus, weak nuclear force binds the atom. B) Strong nuclear force binds the nucleus, electric force binds the atom. C) Weak nuclear force binds the nucleus, strong nuclear force binds the atom. D) Gravity binds the nucleus, electric force binds the atom. E) Electric force binds the nucleus, strong nuclear force binds the atom.
Today, the uranium found on Earth contains 0.720% 235U (with a half-life of 0.700 billion years) and 99.28% 238U (with a half-life of 4.50 billion years)
At a time 2.20 billion years ago, what percent of the uranium on Earth was 238U (assuming that no other uranium isotopes were present)? A) 95.6% B) 2.18% C) 6.29% D) 8.68% E) 4.53%
It is difficult to see items sharply in dim light because what
A. We are seeing primarily with the rods
B. We are seeing primarily with the cones
C. Rods do not adapt to the dark
D. We are mostly seeing with the fovea
The length and width of a standard sheet of paper is measured, and then the area is found by calculation to be 91.50 in2. The number of significant figures in the width measurement must be at least:
a. 5 b. 6 c. 8 d. 4