What made most of the oxygen nuclei in the solar system?
A) stars
B) Nothing makes elements–oxygen has always been present in the universe.
C) the Big Bang
D) our Sun
E) high energy collisions of dust and cosmic rays
A) stars
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The density of an average person is about
1) 480 kg/m3 (30 lb/ft3). 2) 960 kg/m3 (60 lb/ft3). 3) 1920 kg/m3 (120 lb/ft3). 4) 2400 kg/m3 (150 lb/ft3). From this we can see that the volume of a 120-lb person is about 5) 1 ft3. 6) 2 ft3. 7) 3 ft3. 8) 4 ft3. 9) not enough information to estimate.
An electron microscope operates with electrons of kinetic energy 100 keV. What is the wavelength of these electrons? Assume this speed is not relativistic. (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^-19 J, and me = 9.11 × 10^-31 kg)
a. 5.49 × 10^-12 m c. 9.28 × 10^-10 m b. 7.14 × 10^-11 m d. 3.88 × 10^-12 m
A fluid has a density of 1040 kg/m3 . If it rises to a height of 1.8 cm in a 2.0-mm diameter capillary tube, what is the surface tension of the liquid?
a. 0.046 N/m c. 0.092 N/m b. 0.056 N/m d. 0.11 N/m
A pendulum bob swings to and fro as shown in the sketch. The kinetic energy of the bob
1) is maximum at position A, 2) is maximum at position B, 3) is the same at all positions, and the potential energy is maximum at position 4) A. 5) B. 6) is the same at all positions.