A 35 mm camera equipped with a 40 mm focal length lens is used to photograph a tree 17 m tall. The aperture of the lens is set at f/8. A 32 mm high image of the tree on the film is required
The required distance, between the tree and the camera, to take the photograph is closest to: A) 21 m
B) 22 m
C) 23 m
D) 24 m
E) 26 m
A
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Constant Acceleration Kinematics: A train starts from rest and accelerates uniformly until it has traveled 2.1 km and acquired a forward velocity of 24 m/s. The train then moves at a constant velocity of 24 m/s for 400 s. The train then slows down uniformly at 0.065 m/s2, until it is brought to a halt. The distance traveled by the train while slowing down is closest to
A. 4.4 km. B. 4.2 km. C. 4.0 km. D. 3.8 km. E. 3.6 km.
A salt will dissolve in water to form:
a. acids b. gases c. ions d. bases e. polar solvents
The zirconium nucleus contains 40 protons, and an electron is 1.0 nm from the nucleus. What is the electric force exerted on the electron by the nucleus? ( e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 2.9 nN B) 1000 C C) 3.7 nN D) 6.8 nN E) 9.2 nN
Which of the choices below correctly lists things in order from largest to smallest?
A) Sun, Earth, Solar System, Milky Way, Universe B) Universe, Milky Way, Sun, Earth, Solar System C) Solar System, Earth, Sun, Universe, Milky Way D) Universe, Milky Way, Solar System, Sun, Earth E) Milky Way, Universe, Solar System, Sun, Earth