Thermal Expansion: Suppose that a rigid aluminum wire were to be strung out in a loop that just fits snugly around the equator (assuming a perfectly spherical Earth with a radius of 6.37 × 106 m). If the temperature of the wire is increased by 0.50°C, and the increase in length is distributed equally over the entire length, how far off the ground will the wire loop be if it remained centered on the earth? The coefficient of linear expansion of aluminum is 24 × 10-6 K-1.
A. 7.6 mm
B. 76 mm
C. 76 cm
D. 76 m
E. 760 m
Answer: D
You might also like to view...
The unit V is the same as a
A. N/m. B. J/N. C. C/m. D. J/C. E. C/N.
Satellite Motion: A large telescope of mass 8410 kg is in a circular orbit around the earth, making one revolution every 927 minutes. What is the magnitude of the gravitational force exerted on the satellite by the earth? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 6.0 × 1024 kg)
Fill in the blank(s) with the appropriate word(s).
One of the best known craters on Earth is the Barringer Crater in Arizona. It was formed by:
A) a large volcanic eruption. B) the same impact thought to have contributed to the extinction of the dinosaurs. C) the impact of an asteroid whose mass was around 200,000 tons. D) testing of nuclear bombs during the Cold War. E) the impact of a comet whose mass was around 25 tons.
The solution to the solar neutrino problem was
A) the Sun's core is cooling down, producing less neutrinos that expected. B) 2/3 of the neutrinos transform into a new type during the 8-minute trip to Earth. C) the corona is opaque to much of the neutrino radiation. D) the Earth's ozone layer absorbs 2/3 of the neutrinos in transit. E) our solar energy equations were just wrong, and needed much reworking.