By what factor is the resistance of a copper wire changed when its temperature is increased from 30.0°C to 115°C? The temperature coefficient of resistivity for copper = 3.9 × 10^?3 (°C)?1
a. 1.45
b. 1.12
c. 1.33
d. 0.669
e. 4.32
c
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Mass on a Spring: A 0.250-kg stone is attached to an ideal spring and undergoes simple harmonic oscillations with a period of 0.640 s. What is the force constant (spring constant) of the spring?
A. 2.45 N/m B. 12.1 N/m C. 24.1 N/m D. 0.102 N/m E. 0.610 N/m
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Our Milky Way is part of ________ which has about ________ member galaxies.
A. the coma cluster; 500 B. the beehive association; 100 C. the Pleiades; 3 D. the local group; 30
In structure, our Milky Way is most similar to:
A) the Large Magellanic Cloud. B) an upscale version of a globular cluster. C) M-31, the Andromeda Galaxy. D) the Orion nebula. E) None of these.