In a standing wave, not necessarily at the fundamental frequency, on a string of length L, the distance between nodes is
a. l/4.
b. l/2.
c. l.
d. L/4.
e. L/2.
B
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Two vectors lying in the xy plane are given by the equations 
and 
. The value of 
class="Wirisformula" align="middle" /> is A.
B.
C.
D.
E.
Electric field lines symbolize
A. The force a positive charge would experience at the location of the line B. The path a positive charge would take if released at rest on one of the lines C. The distribution of electric charges in space D. Boundaries between regions of positive and negative charge
Calorimetry: A lab assistant drops a 400.0-g piece of metal at 100.0°C into a 100.0-g aluminum cup containing 500.0 g of water at 15.0°C. In a few minutes, she measures the final temperature of the system to be 40.0°C. What is the specific heat of the 400.0-g piece of metal, assuming that no significant heat is exchanged with the surroundings? The specific heat of this aluminum is 900.0 J/kg ? K and that of water is 4186 J/kg ? K.
A. 1900 J/kg ? K B. 2270 J/kg ? K C. 3300 J/kg ? K D. 3800 J/kg ? K E. 4280 J/kg ? K
A table has the same temperature as the air above it. That means that the molecules in the air and in the table have
A. the same average velocity B. the same average energy C. the same average acceleration D. the same average mass