Which of the following statements is currently believed to be true?
a. Electricity is caused by magnetic current loops at the atomic level.
b. Magnetism is caused by electric current loops at the atomic level.
c. All electric fields are produced by moving magnetic poles.
d. Stationary electric charges produce magnetic fields.
e. Steady magnetic fields create electric fields.
b
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Johnny throws a shotput at an angle of 45.° and it travels a horizontal distance of 30. meters. If he releases the shotput at the same speed but changes the angle to 55.°, what will be the new range (distance)?
A) 25. m B) 28. m C) 41. m D) 32. m E) 37. m
Determine (a) the temperature at the 16 equally spaced points shown in the accompanying sketch to an accuracy of three significant figures and (b) the rate of heat flow per meter thickness. Assume two-dimensional heat flow and k = 1 W/(mK).
GIVEN
A two-dimensional object with specified surface temperatures
FIND
(a) The temperature at the 16 specified locations
(b) The heat flow per meter thickness
ASSUMPTIONS
Steady state
SKETCH
The estimated age of the Milky Way Galaxy is about 13 billion years.
Answer the following statement true (T) or false (F)