A certain uniform spring has a constant k. Now the spring is cut in half. What is the relationship between k and the spring constant k’ of each resulting smaller spring?
1. Each k’ = k/2
2. Each k’ = 2k
3. Each k’ = k/4
4. Each k’ = 4k
2
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A) 40 m/s westward. B) 100 m/s eastward. C) 40 m/s eastward. D) 30 m/s westward. E) 100 m/s westward.
The magnetic field of the Earth is believed responsible for which of the following?
a. deflection of both charged and uncharged cosmic rays b. deflection of charged cosmic rays c. ozone in the upper atmosphere d. solar flares
Radiation: If the absolute temperature of an object is tripled, the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change) will
A. increase by a factor of 3. B. increase by a factor of 9. C. increase by a factor of 18. D. increase by a factor of 27. E. increase by a factor of 81.
Which of the following best describes the composition of the particles forming Saturn's rings?
A) methane ice B) hydrogen and helium C) water ice D) metallic grains E) volcanic rock