What is meant by a line spectrum?
a. a spectrum which is straight
b. a spectrum made of bright lines in certain places, separated by dark gaps
c. a spectrum made by a hot filament stretched into a straight line
d. none of the above
b
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The angular size of the Sun as observed from Earth is about 0.5 degree.
Answer the following statement true (T) or false (F)
Propped cantilever beam AB has moment M1 applied at joint B. Framework ABC has moment M2 applied at C. Both structures have con-stant flexural rigidity EI. If the ratio of the applied moments M1/M2 5 3/2, the ratio of the joint rotations at B, ?B1/?B2, is approximately:
(A) 1
(B) 3/2
(C) 2
(D) 5/2
Due to its larger mass, the Sun's gravitational effect on Earth's tides is greater than the Moon's
Indicate whether the statement is true or false
In an electrical circuit, the number of "amperes" measures the
A) amount of thermal energy produced in the circuit. B) amount of electric current consumed by the circuit elements. C) amount of electric current flowing around the circuit. D) amount of energy given to each coulomb of electrical charge. E) voltage around the circuit.