The Julian calendar, which has 365 days and a leap day every 4 years, was no longer used in Europe after 1582 because
a. it is slightly inaccurate and after 1600 years of use caused large problems.
b. leap years are rough on people born on February 29.
c. people realized that the Roman calendar is better.
d. it had 13 months, which is unlucky.
e. none of the above; we still use it.
a
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Alternating current has an advantage over direct current because ________
a. one can step up the voltage that one can use b. batteries can be displaced in most circuits c. electrical generators can be made to function d. incandescent lights will only work with AC
What sorts of materials serve as moderators in nuclear reactors?
a. water c. graphite b. boron d. concrete
A motor drives a shaft with diameter d 5 46 mm at f 5 5.25 Hz and delivers P 5 25 kW of power. The maximum shear stress in the shaft is approximately:
(A) 32 MPa
(B) 40 MPa
(C) 83 MPa
(D) 91 MPa
G-, K-, and M-type stars
A) do not contain enough heavy elements to form planets B) have lifetimes long enough for planets to form and for simple life to appear, but not long enough for advanced life to develop C) have lifetimes too short for planet formation D) have lifetimes long enough for advanced life to evolve