A 25-mH inductor is connected in series with a 20-? resistor through a 15-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the current when t = 2.0 ms?
A)
0.40 A
B)
0.50 A
C)
0.60 A
D)
0.70 A
E)
0.80 A
C
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A stone is thrown at an angle of 30° above the horizontal from the top edge of a cliff with an initial speed of 14 m/s. A stop watch measures the stone's trajectory time from top of cliff to bottom to be 7.1 s. How far out from the cliff's edge does the stone travel horizontally? Note: g = 9.8 m/s2 and air resistance is negligible
a. 58 m c. 86 m b. 68 m d. 197 m
What are we seeing in this Hubble Space Telescope photograph?
A) Almost every object in the photo is a galaxy, and these galaxies are at many different distances from us. B) This photo shows the Virgo supercluster of galaxies. C) Most of the dots in this photo are stars in the Milky Way, but we see a few blotches that represent galaxies beyond the Milky Way. D) This is the Local Group of galaxies.
Leptons are built out of quarks
Indicate whether the statement is true or false
Two pipe columns are required to have the same Euler buckling load Pcr. Column 1 has flexural rigidity EI and height L1; column 2 has flexural rigidity (4/3) EI and height L2. The ratio (L2/L1) at which both columns will buckle under the same load is approximately:
(A) 0.55
(B) 0.72
(C) 0.81
(D) 1.10
