Two parallel and coaxial current loops of radius a are placed a distance 2L apart. The current in each ring circulates in the same direction. At a point on the axis half way between the loops the magnetic field in T has magnitude
A.
B.
.C.
.D.
.E.
.Answer: D
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Conversion of Units: Hydraulicists often express rainfall in acre-feet. This is the amount of water required to cover an area of one acre to a depth of one foot. There are 640.0 acres in a square mile, and 5280 feet in one mile. How many cubic feet are there in one acre-foot?
Fill in the blank(s) with the appropriate word(s).
A dragster starts from rest and travels 1/4 mi in 6.70 s with constant acceleration. What is its velocity when it crosses the finish line?
A) 296 mi/h B) 269 mi/h C) 188 mi/h D) 135 mi/h
Find the tension in an elevator cable if the 1 500-kg elevator is descending with an acceleration of 2.8 m/s2, downward
a. 1.9E+4 N b. 1.1E+4 N c. 4.2E+3 N d. 2.7E+1 N e. 2.1E+2 N
A ray of light enters a pane of glass with an angle of incidence of 
The index of refraction of the glass is 1.48. What is the angle of incidence on the far side of the pane of glass?
A. 
B. 
C. 
D. 
E. 