When considering light as made up of individual "pieces," each characterized by a particular amount of energy, the pieces are called
A) photons.
B) wavicles.
C) gamma rays.
D) frequencies.
A
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A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000 N is applied to the end to stretch the rod by 1.00 mm. What is the tensile modulus for this rod?
a. 
b. 
c. 
d. 
e. 
Two parallel straight wires are 7.0 cm apart and 50 m long. Each one carries a 18-A current in the same direction. One wire is securely anchored, and the other is attached in the center to a movable cart
If the force needed to move the wire when it is not attached to the cart is negligible, with what magnitude force does the wire pull on the cart? (?0 = 4? × 10-7 T ? m/A) A) 46 mN B) 37 mN C) 66 mN D) 93 mN
Transformers: An ideal step-down transformer is needed to reduce a primary voltage of 120 V to 6.0 V. What must be the ratio of the number of turns in the secondary to the number of turns in the primary?
Fill in the blank(s) with the appropriate word(s).
According to modern science, what was the approximate chemical composition of the solar nebula?
A) 98% hydrogen and helium, 2% everything else B) 50% hydrogen and helium, 50% everything else C) 98% hydrogen, 2% helium D) roughly equal proportions of hydrogen, helium, water, and methane