Transformers: The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns. If the ac current in the secondary coil is 2 A, what is the current in its primary coil?
A. 2 A
B. 8 A
C. 1/2 A
D. 1/4 A
E. 4 A
Answer: B
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What is the magnitude of the magnetic field at point P if a = R and b = 2R?
a.
Recent discoveries of two types of brown dwarfs have placed these stars near which spectral type of star?
a. hotter than O stars b. cooler than O stars c. hotter than M stars d. cooler than M stars e. at exactly the same level as G stars
Your friend applies a horizontal force to your 2.0-kg physics textbook, which rests stationary against a vertical wall. The static and kinetic friction coefficients between the book and the wall are 0.20 and 0.15, respectively. With what force must your friend push on the book in order that it doesn’t slip down the wall?
A. 39 N B. 20 N C. 19.6 N D. 25 N E. 98 N
A rod with a diameter of 2.00 mm projects 20.0 mm horizontally outward from a wall. A 2.00 N coat is hung from the end of the rod and the rod deflects downward by 
The shear stress of the rod is
a. 
b. 
c. 
d. 
e. 