A 35-mm camera equipped with a 95 mm focal length lens is used to photograph a tree that is 8.0 m tall. A 32 mm high image of the tree on the film is needed
The required distance, between the tree and the camera lens, to take the photograph is closest to
A) 26 m. B) 27 m. C) 24 m. D) 25 m. E) 29 m.
C
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A ball with a diameter of 20.00 cm is placed in water with 75% of its volume out of the water. The buoyant force of the water on the ball is
A. 16.67 N. B. 14.75 N. C. 13.60 N. D. 12.56 N. E. 10.26 N.
A steel wire hangs from a high-altitude balloon. The steel has unit weight 77 kN/m3 and yield stress of 280 MPa. The required factor of safety against yield is 2.0. The maximum permissible length of the wire is approximately:
(A) 1800 m (B) 2200 m (C) 2600 m (D) 3000 m
Contrast image formation in reflectors and refractors
What will be an ideal response?
Light having a speed in vacuum of 3.0 × 108 m/s enters a liquid of refractive index 2.0. In this liquid, its speed will be
A) 6.0 × 108 m/s. B) 3.0 × 108 m/s. C) 1.5 × 108 m/s. D) 0.75 × 108 m/s. E) 0.67 × 108 m/s.