Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of –1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
a. 42 N/C
b. 84 N/C
c. 34 N/C
d. 68 N/C
e. 0
b
Physics & Space Science
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Which of the following would correctly convert a Fahrenheit temperature (F) to a Kelvin (K) value?
A) K = (5/9)(F - 32) B) K = (5/9)F + 255 C) K = (5/9)F - 273 D) K = (9/5)F + 273 E) K = (9/5)(F - 32 ) + 273
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Gamma radiation is in fact which of the following?
a. electrons c. positrons b. high energy quanta d. helium nuclei
Physics & Space Science
Binary star systems are considered good candidates in SETI
Indicate whether the statement is true or false
Physics & Space Science
During the Precambrian, the development of the ozone layer helped
A) primitive organisms on Earth's surface to nucleate. B) shield Earth's surface from harmful ultraviolet radiation. C) promote the emergence of stromatolites. D) promote the development of anaerobic organisms.
Physics & Space Science