Pierre performs a maneuver with his yo-yo called "around the world", where he swings the yo-yo in a vertical circle. When the yo-yo is at its highest point, which forces provide the centripetal acceleration?
a. friction
b. gravity
c. normal force
d. tension
e. Two of the above choices are correct.
e
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Structure 1 with member BC of length L/2 has force P1 applied at joint C. Structure 2 with member BC of length L has force P2 applied at C. Both structures have constant flexural rigidity EI. If the ratio of the applied forces P1/P2 5 5/2, the ratio of the joint B reactions RB1/RB2 is approximately:
(A) 1
(B) 5/4
(C) 3/2
(D) 2
The number of _______________ visible on the Sun varies in a cycle with a period of 11 years
Fill in the blank(s) with correct word
Which of the following are active galaxies?
A. quasars B. radio galaxies C. Seyfert galaxies D. All of these choices are correct.
Reducing the lens aperture size is a scheme one can use to reduce the occurrence of which of the following effects?
a. spherical aberration b. mirages c. chromatic aberration d. light scattering