Which of the following are flavors of quarks?
A. leptons and antilepton
B. charge and mass
C. top and up
D. blue and green
E. baryons and antibaryons
Ans: C. top and up
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The distance d through which a beam of length L is deflected when it is subjected to a load may be described by the relationship d = R L2. What are the dimensions of the constant R?
A) (meters)3 B) (meters)2 C) meters D) (meters)-1 E) R is dimensionless
Why do bridges have expansion joints?
a. They would buckle and crack otherwise. b. to let water run off c. to absorb vibrations due to traffic d. for ease in construction
The angular size of the Moon in the sky is about
a. 1/2 degree. b. 5 degrees. c. 10 degrees. d. 1.6 kilometers. e. 4000 kilometers (1/4 Earth's diameter).
A voltage DV is applied across the ends of a Nichrome heater wire having a cross-sectional area A and length L. The same voltage is applied across the ends of a second Nichrome heater wire having a cross-sectional area A and length 2L. Which wire gets hotter?
1.The shorter wire does. 2.The longer wire does. 3.More information is needed.