How much work is required to stretch an ideal spring of spring constant 40 N/m from x = 0.20 m to x = 0.25 m if the unstretched position is at x = 0.00 m?
A) 0.45 J
B) 0.80 J
C) 1.3 J
D) 0.050 J
A
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The reaction force at C (lb) for the beam below is:
(A) 675 lb
(B) 985 lb
(C) 775 lb
(D) 525 lb
The public debate about Martian canals was not resolved until
A) many scientists were unable to reproduce Percival Lowell's sketches of Martian canals B) the governing body of astronomy, the International Astronomical Union made an official statement on the matter C) the first spacecraft flew past Mars in 1965 D) the first spacecraft landed on Mars in 1976
An open freight car rolls friction-free along a horizontal track in vertically pouring rain. As water accumulates in the car, its speed
A) increases. B) decreases. C) doesn't change.
Outlets on a household circuit are arranged in
A) neither series or parallel. B) series. C) parallel. D) a combination of series and parallel. E) not given