What is the power of a lens that has a focal length of -40 cm and a width of 2.0 cm?
A) -2.5 diopters
B) -0.50 diopters
C) +2.5 diopters
D) +4.0 diopters
E) -50 diopters
A
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A plane truss composed of two steel pipes (E 5 210 GPa, d 5 100 mm, and wall thickness 5 6.5 mm) is subjected to vertical load W at joint B. Joints A and C are L 5 7 m apart. The critical value of load W for buckling in the plane of the truss is nearly:
(A) 138 kN
(B) 146 kN
(C) 153 kN
(D) 164 kN
Which two jovian planets have magnetic field tilts that are NOT along their rotation poles?
A) Saturn and Neptune B) Uranus and Neptune C) Jupiter and Uranus D) Jupiter and Saturn E) All jovian planets have magnetic fields close to their rotational axes.
Brick A is dropped from the top of a building. Brick B is thrown straight down from the same building. Neglect air. Which statement about their accelerations is correct?
A) The acceleration of A is greater than the acceleration of B. B) The acceleration of B is greater than the acceleration of A. C) The two bricks have exactly the same acceleration. D) Neither brick has any acceleration once it is released.
Estimate Comet Tempel 1's diameter, using the scale bar in the photo.
What will be an ideal response?